J.LANFRANCO & CIE is a manufacturer of high performance fasteners including all-metal and nylon insert locknuts, clinch nuts and inserts, modular fixtures, bolts and washers.

J.LANFRANCO all-metal locknuts have no plastic inserts. They are suitable for applications under extreme temperatures, corrosive environments effective or those under high levels of vibration. J.Lanfranco all-metal locknuts come in different versions (types) outlined below:

ESL: Dual-slotted, all-metal, reusable slotted self-locking hexagon nuts. Extremely reliable with consistent prevailing torque, and no galling.

ERM: All-metal, reusable self-locking hexagon nuts with double slots & UNC/UNF or Metric moving washer. Time saver nuts with integrated disc spring washers for quick installations and absolute tension maintained under dynamic loads.

THU: Full-height, heavy hex industrial version of the ESL nuts. Feature a robust industrial design and superior resistance to vibration, corrosion, and temperature.

Single Slot Self-locking Hexagon nuts HCB, HCE & HCT. All supplied with ISO 965-2 standard threading. All offered in steel ISO 898-2/ISO 2320 & stainless steel ISO 3506-2/NF E 25-035-2 in different metric diameters, fine pitch, special height, non-standard hexagon on request.

HCB: Single-slotted, extra low height, locking jam nuts.

HCE: Single-slotted, normal self-locking hexagon nuts.

HCT: Reusable one-piece, full-height locknuts ideal for high temperature areas.

GSL: ISO 7042 locknuts offered in metric steel class 8, 10, 12 and stainless steel A2-70 & A4-80

HUS Starnut: Standard deformed thread locking nuts also known as a “top locking” type nuts.

SPR: Hex nuts with crimped, deflected metal ring.

SRF: Top locking style flange nuts in which locking is achieved by deformation of the last thread.

J.LANFRANCO nylon Insert locknuts are self-locking hex nuts with a standard or high temperature nylon ring to generate prevailing torque. Product portfolio includes a full line of metric nylon insert nuts as well as imperial NE, NU, NTU patterns in UNJC & UNJF thread form MIL-8879 or MIL-S-7742. Nylon Insert locknuts come in the following versions (types):

HMP ISO 10511: Low-height metric nylon insert locknuts to ISO 10511.

HUP ISO 7040: Nylon insert locknuts made to all major metric and imperial standards (ISO 7040, IFI 100/107). Available in carbon steel, stainless steel, and exotics. UNJC & UNJF threads are also available.

EUM: Nylon insert self-locking nuts with a free spinning conical washer.

J.LANFRANCO & CIE fasteners are widely used in different industries for automotive/bodywork, vehicle substructures, transportation plant construction, rail vehicles/bogies, energy supply/power plant construction, shipping but also for aerospace and defence applications.

For additional information please consult the Product Description section & the supplied documentation.

Self-locking nuts (aka lock nuts) are widely used in applications in which motion or vibration can cause fasteners to become loose. Lock nuts conforming to DIN 980 stanard are all metal prevailing torque, hexagonal nuts and they  are available in two types, DIN 980 V-type (DIN980/V) with a distorted thread and DIN 980 M-type ((DIN980/M) with an embedded metal locking plate.

In DIN 980 V-type distorted thread nuts, certain teeth of the nut thread are deformed through die stamping resulting in the inner diameter of the nut thread being slightly smaller than the outer diameter of the bolt thread. Therefore, the friction force between the threads after the nut is tightened is far greater than that of the common thread, which can play an effective role in preventing loosing. 

In DIN 980 M-type nuts, the nut is embedded with a metal locking plate after heat treatment. The inner diameter of the metal plate is slightly smaller than the outer diameter of the bolt thread. After the nut is tightened, the metal plate blocks the bolt thread, thus preventing loosening.

DIN 980 lock nuts must be tightened with tools (such as ratchet spanner) during installation. Although they can be can be used repeatedly, frequent disassemblies and installations are not recommended as the locking torque of the nut will decrease significantly.

Depending on the producer, DIN 980 lock nuts are manufactured in different metric thread sizes (M3 ~ M39) from carbon steel in various strength classes (such as  4, 6, 8, 10 and 12) or stainless steel in grades 70 and  80. They are offered in various finishes such as plain, black, zinc/yellow plated, H.D.G, and chrome plated.

Both DIN980/V and DIN980/M lock nuts are offered as part of our own (AVIATIONEU NEW ERA) product lines. Sourced from quality manufactuurers they are competitively priced and can be supplied in carbon steel or stainless steel, in different grades, metric thread sizes  and finishes .

For additional information please consult the supplied documentation.

Notes:

Different metric thread sizes are designated by the letter "M" indicating the nut's clearance diameter in mm.

Nut thread pitch indicates the distance between threads measured along the length of the nut expressed in mm.

In the case of stainless steel lock nuts, the stainless steel grades are denoted with codes such as A2 or A4 and dash numbers indicating the minimum tensile strength to be met by the material. For example, A2-70 relates to a lock nut made from 304 stainless steel with a minimum tensile strength of 700N/mm² (MPa).

The NAS1423/NAS509 series hexagon nuts fall into the jam (aka check or thin) nut category. Jam nuts are a style of nut that features a low profile, typically half the height of standard nuts and diagonal drilled holes. Their minimal thickness allows them to fit in tight spaces where ordinary nuts might not fit. NAS1423 series jam nuts are manufactured from 4130/4340 cadmium plated steel alloy or unplated A 286 stainless steel (designated by the letter "C" in the part number). NAS509 series jam nuts NAS1423 series jam nuts are manufactured from 4130/4340 cadmium plated steel alloy or corrosion resistant steel passivated (designated by the letter "C" in the part number).

Sourced from quality producers, the NAS1423/NAS509 Series check nuts are offered as part of our own label (AVIATIONEU NEW ERA) product lines with Right or Left  Hand threads in different sizes in inches. Letters "R" and "L" in the end of the product reference number (SKU) indicate a Right or Left Hand thread respectively. Sold in pieces or packs of specified nuts per pack indicated after the letters "PK" in the product reference number (SKU).

For additional information please consult the supplied documentation or contact us.

Steel Nut Specifications:

Material - 4130 Alloy Steel Per AMS-S-6758

Finish - Cad Type II, Class 2 Per AMS-QQ-P-416

Heat Treat- 150 KSI Min Per AMS2759

Hardness - 34-38 HRC

Thread Series & Class: UNJF 3B (Unified National Fine thread series with external thread controlled root radius)

Note: UNJ, UNJC, UNJF and UNJEF thread series are almost identical to the respective UN, UNC, UNF, and UNEF threads except that the external J thread has a much larger root radius than the standard UN threads and inspection must be performed on this element. The Special UNJ threads are designated by the nomenclature UNJS. J screw threads feature a root radius which improves the tensile stress area of the fastener and helps to reduce the stress concentration factor in the thread thus making the thread stronger. Additionally, the requirement for high strength is achieved with 3A and 3B classes of fit. All pitch diameters and tolerances are based on the Unified Inch Standard.

Nuts are extensively used in a wide range of aerospace and industrial applications. Self-locking nuts are those containing a locking feature as an integral part. 

Hexagon self-locking nuts of both low (thin pattern) and regular height (pattern) used in aerospace and defense applications comform to different Standards and they are designed for use in high temp installations (up to 250°F or 1200°F for those from silver-plated stainless steel). Low height self-locking nuts complied with Army & Navy AN 364 superseded by Mil Standard MS 20364 which was in turn superseded by the newer Mil Standard MS 21083. Similarly, Army & Navy AN 365 Standard relating to regular height nuts was superseded by Mil Standard MS 20365 and this in turn by MS21044. Furthermore, MS Standards have been replaced by NASM National Aerospace Standards with their part identification numbers remaining the same. For example, nuts with PNs MS21083 and NASM21083 are identical.

Regular height NASM/MS 21044 self-locking nuts and their low-height NASM/MS 21083 counterparts replace the superseeded MS 20365  / AN 365 & MS 20364 / AN 364 for respective materials and sizes but their older Standard part numbers (although cancelled) are still commonly used in the market. Sourced from quality manufacturers, these nuts are offered as part of own labelled (AVIATIONEU NEW ERA) product lines in different materials and finishes (e.g. cadmium plated alloy steel, corrosion resistant steel passivated,copper cadmium plated, aluminum alloy anodized), and different dimensions and thread sizes in inches. Cadmium plated nuts are furnished to military specifications while stainless steel nuts are supplied to military specification and commercial grade. These nuts come either with all metal or non metallic inserts (often termed as fiberlock or elastic stop to create friction and prevent loosening from vibration) designated by the letters "C" and "A" respectively after the dash number. No letter indicates an all metal or a non metallic insert nut. They are reliable and economical fastening devices with their inserts providing a friction grip on the threads of the bolt  holdsing it securely.

The following letters after the dash in their part number indicate their materials and finishes:

"B" Copper alloy - Cadmium plated

"C" Corrosion resistant steel (stainless steel) - passivated

"D" Aluminum alloy - Anodised

"N" Steel alloy - Cadmium plated

For example, MS21044C3 is a corrosion resistance steel self-locking nut with a thread size of 10-32, while MS21044N3 is a steel alloy nut with the same thread size.

Sold in pieces or packs. 

For additional information please refer to the supplied documentation or contact us.

A nylon-insert lock nut (also referred to as elastic stop nut, nut with a non-metallic insert  or nyloc nut) is a type of locknut with a nylon collar that increases friction on the screw thread. Nyloc nuts are widely used in products and structures subject to dynamic loads where motion or vibration can cause fasteners to become loose. Their design prevents the connection from loosening without the need for additional lock washers.The nylon insert is situated at the top of the nut and when tightened locks against the thread. The insert deforms elastically over the threads as tightening pressure is applied. The insert locks the nut against the screw as a result of friction, caused by the radial compressive force resulting from the deformation of the nylon. Nyloc nuts retain their locking ability up to 250 °F.

Metric hexagonal nylon-insert self-locking nuts are high anti vibration and anti loose fastening parts conforming to DIN 982 and DIN 985 standards. Different metric thread sizes are designated by the letter "M" indicating the nut's clearance diameter in mm. The main difference between DIN 982 & DIN 985 is the height of the nuts for same thread diameter. DIN 982 lock nuts (often termed as “P” Type) are taller than DIN 985 (aka “T” Type) ones. Lower profile  DIN 985 are used in places where height is limited, while standard height DIN 982 nuts are used in connections where increased strength and fixation are required. In addition, the size range of DIN 985 nuts is wider than that of DIN 982. DIN 985 Nylon self-locking nuts can be used in various mechanical and electrical products with temperature from – 50 ℃ to 100 ℃. Due to their significantly higher anti vibration and anti loose performance than other anti loose devices, their application ranges from  tanks, mining, agricultural, textile &  various kinds of machinery to automobiles and aerospace.

Both DIN 982 and DIN 985 lock nuts are offered as part of our own (AVIATIONEU NEW ERA) product lines. Sourced from quality manufacturers they are competitively priced and can be supplied in different materials (Steel, Brass, Carbon Steel, Alloy Steel & Stainless Steel), grades (Class 5, 6, 8 or 10), metric thread diameters (typically M3/3 mm to M30/30 mm or up to 48 mm for DIN 985 nuts), thread pitches and finishes (natural, electro zinc-plated, chrome plated, black oxide and others). Sold in pieces or packs with number of pieces per pack indicated after "PK" designation in product SKU.

Notes:

Nut thread pitch indicates the distance between threads measured along the length of the nut expressed in mm.

In the case of stainless steel lock nuts, the stainless steel grades are denoted with codes such as A2 or A4 and dash numbers indicating the minimum tensile strength to be met by the material. For example, A2-70 relates to a nylon-insert lock nut made from 304 stainless steel with a minimum tensile strength of 700N/mm² (MPa).

National Aerospace Standards (NAS) are voluntary standards developed and maintained by committees and working groups of subject matter experts from member companies of the U.S. Aerospace Industries Association (AIA).

These standards have served as the foundation for the development of aircraft, spacecraft, watercraft, ground vehicles, machinery, and electronics.

NAS parts are most well-known for state-of-the-art, high-strength, precision fasteners, electrical connectors, splices and terminations, rod end bearings, and many other types of hardware and components. The NA prefix relates to metric standards. 

NAS 1022 Series Hex Self-Locking Machine Nuts form part of NAS high-strength, precision fasteners. These low height and strength hexagon machine nuts are sourced from quality manufacturers and offered in different materials and finishes as part of our own labelled (AVIATIONEU NEW ERA) product lines in different thread sizes and dimensions in inches. Those from 450 deg. low strength steel are designated by the letter "A" after NAS1022. Similarly, the letter "C" designates nuts from corrosion resisting steel passivated while the letter "N" refers to steel cad plated nuts.

DIN LN 9338 / LN 9161 Standard nuts are hexagon flanged self Locking  nuts offered in Metric thread sizes. Also known as K-Nuts, these 6 point self locking nuts with integral washer are commonly used in aerospace and motorsport applications. Both are lightweight, with a reduced height for use in confined areas, a high mechanical resistance, corrosion resistance and a wide operating temperature range. DIN LN 9338 nuts are made of alloy steel (typically  35CrMo4 steel) and cadmium plated.  They can be used for temperatures up to 235 °C. Their counterparts of the LN 9161 Standard are offered in Regular and High Temperature versions. The high temperature LN 9161 nuts differ from regular ones in terms of material, finish and temperature class. Regular LN 9161 nuts typically made of 35CrMo4 aerospace steel with cadmium plating are intended for use for temperatures up to 315 °C while high temperature LN 9161 nuts from Stainless A286 CRES with silver plating can cover temperature requirements of up to 425 °C.

Depending on the Standard, DIN LN 9338 / LN 9161 nuts are offered in different thread sizes from various manufacturers including HOWMET AEROSPACE (separately listed), PAOLO ASTORI, ECROU AVIATION and others. 

For additional information please refer to the supplied documentation or contact us. 

Boeing & Airbus, the two leading airframe builders, have developed specifications for fasteners, hardware and other parts manufactured by different companies. Compliance with  Boeing (aka BAC) and Airbus (aka ASNA) Standards is a  prerequisite for installation or use of these parts on their respective aircraft. In many cases, Boeing & Airbus fasteners and other parts have the same fit, form, and function and they are considered as alternatives or substitutes to the respective parts designed and/or manufactured by industry leaders such as HI-SHEAR  or HOWMET in the case of fastening products.They also conform to widely accepted Military & Aerospace Standards such as AN, MS, NAS and others. However, caution is required as, depending on their series & conforming standard, fasteners are offered in Imperial (in.), Metric (mm) systems, or  both, with resulting variations in their dimensions and units of measurement of their properties.

As a result of the extensive portfolio of fastening products (including screws and bolts, nuts, washers, pins, rivets, clamps, and many others) from different leading suppliers, and those falling under Boeing, Airbus, Military and Aerospace Standards, these are listed separately in our Web Platform for Supplies.  It must be noted that, depending on the intended application, usually more than one options are available to prospective buyers and selection is finally made, apart from specifications, on the basis of price or lead time required for non-stock parts. Whenever possible,correlation tables and other information and documentation is provided to facilitate the users' awareness on interchangeability of offered fasteners and the selection of the right parts for their intended application. For additional information please contact us.

NAS1291 Series Nuts

The NAS1291 series lock-nuts are widely used throughout the aerospace industry. They are thin-walled, self-locking nuts with a reduced height and are made of silver plated corrosion resisting (stainless) steel for maximum temperatures 800°F or cadmium plated alloy steel for maximum temperatures 450°F, and offered with or without dry film lubricant The NAS1291 series of nuts ranges in size from 02 to 10 corresponding to thread diameters of .086 to .6250 inches. The following designators indicate the material and the dry film lubrication of these nuts:

- No letter after NAS1291 indicates nuts made of cadmium plated alloy steel with dry film lubrication,

- The letter "X" after NAS1291 is used to designate nuts made of cadmium plated alloy steel without dry film lubrication,

- The letter "C" after NAS1291 indicates nuts made of silver plated corrosion resisting steel (CRES) for use at max temperature 800°F.When the letter "M" is included in the end of the part number, dry film lubrication is included & max temperature is 450°F.

Nuts NAS1291-02 thru -6, NAS1291X02 thru X6, NAS1291C04 thru C6 are inactive for new design. They have been superseded by respective nuts of NASM21042/MS21042 and NASM21043/MS21043 series.

NASM21042/MS21042 and NASM21043/MS21043 Series Nuts 

The MS21042 series (superseded by NASM21042 series) are all-metal hexagon reduced height self-locking nuts, rated at 160,000 psi tensile strength, made of cadmium plated steel. They are shorter than the AN363 nut but develop the same tensile strength. They are also  lighter than AN365 nylon lock nuts (an average of 63% lighter for sizes -3 through -6).The NASM21042/MS21042 lock nuts are widely used throughout the aerospace industry together with those of MS21043 series (superseded by NASM21043) all-metal reduced hexagon, reduced height self-locking nuts with a ring base made of corrosion resistance steel and silver plated. Because of their reduced hex dimension, they are widely used in limited space applications where wrench access is a problem. Both are designed for use in high temperature installations (up to 450°F for MS21042 series  and up to 800°F for MS21043 series nuts). They both come without or with or  a dark grey dry film lubricant, indicated by the letter "L" in their part number.

Sourced from quality producers, NAS1291, NASM/MS 21042 and 21043 series nuts are offered as part of our AVIATIONEU NEW ERA product lines. Sold in pieces or packs with the number of nuts per pack indicated after the letters "PK" at the product reference code (SKU).

Depending on the selected nut  & stock conditions alternate part numbers of the same fastener may be supplied in lieu of the ordered, meeting or exceeding standard specifications of ordered parts. 

For more information please refer to the supplied documentation.

These AVIATIONEU NEW ERA hexagon locking nuts comform with ASTM A194 standard specification for carbon, alloy and stainless steel nuts used in high pressure, temperature or other special-purpose applications. They can be indicatively used in the process industries, such as petroleum and chemicals for pressure vessels, valves, flanges, and fittings. Sourced by certified manufacturers these nuts are competitively priced and offered in metric (M3 - M36 diameter) or inch (3/16" - 1.1/2") sizes, different thread types and grade range to meet respective design, service conditions, mechanical properties, and high temperature requirements. Please refer to ASTM A194  specification table for additional information. Sold in packs of 100 pcs each.  Appearing price is for reference only per pack. Please contact us for a quotation.

A wide range of Stainless Steel Hexagonal Nuts are offered as part of our own label (AVIATIONEU NEW ERA) product lines to meet diverse applications in aerospace and other industrial sectors. An overview of this product family structured in series is included below wihile additional information are included in the Product Description section. Sourced from quality manufacturers these nuts are available in different stainless steel materials, Metric or inch sizes, threads types and classes and comply with different standards/specifications depending on the selected product. Depending on selected nut size they are sold in pieces or convenient pacls of specified number of nuts per pack indicated after the letters "PK" in the product reference number (SKU). For further information please consult the supplied documentation or contact us.

AVIATIONEU NEW ERA AISI 304 Stainless Steel Nylon Insert Hex Lock (Elastic Stop) Nuts - Inch System. Retain locking ability up to 250 °F (121 °C).

AVIATIONEU NEW ERA AISI 304/316/667 Stainless Steel Hexagonal Lock Nuts - Metric System

AISI 304, 316 or 667 Stainless Steel. Meet DIN 985 standard. They feature a coarse thread type, bright finish and a strength class of  A2-70.

AVIATIONEU NEW ERA AISI 304 Stainless Steel Hexagonal (Non Lock) Nuts - Metric System

AISI 304 Stainless Steel. Meet DIN 439 standard. They feature a coarse thread type, bright finish and a strength class of  A2-70.

AVIATIONEU NEW ERA  AISI 410 Stainless Steel Hexagonal (Non Lock) Nuts - Metric System

ASTM A193 Grade B6 Stainless Steel Hexagonal Nuts combining high tensile strength, excellent resistance to corrosion, durability and long service life. Used in different high tensile strength and corrosion resistance applications.

AVIATIONEU NEW ERA AISI 304 Stainless Steel Nylon Insert Hex Jam Lock Nuts - Inch System

 Low profile lock nuts fromAISI 304 Stainless Steel. Suitable for corrosion resistance in applications exposed to fresh water.

AVIATIONEU NEW ERA 18-8 Stainless Steel Hex Jam Nuts - Inch System, UNEF Thread Type

Exhibit good chemical resistance and may be mildly magnetic. Used in low-clearance applications. Offered as RH or LH Threaded (UNEF Thread Type).

AVIATIONEU NEW ERA 18-8 / AISI 316 Stainless Steel Hex Panel Nuts - Inch System, UNEF Thread Type

Extremely thin nuts for tight spaces such as electrical panels. Can be furnished in 18-8 or AISI 316 Stainless Steel in different finishes. Those with a black-oxide finish have a dark surface color.

AN315/NASM315 Series hex plain nuts are manufactured from steel and cadmium plated per QQ-P-416A, Type II, Class 3, corrosion resistance steel or aluminum alloys. The AN315 nuts have been superseded by NASM315 Series. Similar to common nuts  but with a rugged construction they are designed and built with aviation grade materials and to specific aviation design specifications. They can carry the same high tension load as the AN310 castle nuts and require an auxiliary locking device such as a check nut or lock washer. 

Sourced from quality producers, the AN315/NASM315 Series hex plain nuts are offered as part of AVIATIONEU NEW ERA product lines in different thicknesses and thread sizes in inches. The following letters are used to designate specific types of airframe nuts:

"C" before dash number for corrosion resistance steel nuts

"D" before dash number for aluminum-alloy nuts

"L" after dash number for left-hand thread

"R" after dash number for right-hand thread

For additional information please consult the supplied documentation or contact us.

Certification Details:

AN315 (REV. 10) (NOTICE 2)., AIR FORCE-NAVY AERONAUTICAL STANDARD: Nut, Plain, Castellated, Airframe (23 SEP 2002) [S/S BY NASM315]., AN315 REV. 10, dated 29 DECEMBER 1972, is hereby canceled and superseded by NASM315. The Part Identification Number (PIN) for AN315 REV. 10 and the part number for NASM315 are identical. The part numbers have not been changed.

AN316/NASM316 Series hexagonal steel cadmium plated  thin non-locking check nuts are Military Specification versions of non-locking jam nuts used typically to lock in adjustments where a male threaded part screws only partway into a female threaded part (rod ends, grub screws, bulkhead fittings, etc). AN316/NASM316 Series jam nuts are thinner than the AN315 specification nuts for use in tighter installations but the AN316/NASM316 hex check nuts can carry half the tension load of the AN315 nuts.

Sourced from quality producers, the AN316/NASM316 Series check nuts are offered as part of AVIATIONEU NEW ERA product lines in steel cadmium plated or corrosion resistant steel (CRES) passivated (indicated by the letter "C" replacing the dash number) in different thicknesses and thread sizes in inches.  Letters "R" and "L" after the dash number indicate a Right or Left Hand thread respectively. For additional information please consult the supplied documentation or contact us.

Certification Details:

AN316 (REV. 11)., AIR FORCE-NAVY AERONAUTICAL STANDARD: Nut, Jam, Hexagon (25 Feb 1991). Superseded by NASM316. The Part Identification Number (PIN) for AN316 and the part number for NASM316 are identical. The part numbers have not been changed.

Screws, bolts and nuts are standard fastening hardware widely used in a range of applications. 

Internal wrenching (also known as Allen) fasteners are threaded fasteners. Screws and bolts have a drive recess within the head allowing the insertion of an internal wrench for their installation or removal. Allen socket set screws are blind (headless) fasteners with an internal hex drive offered in different styles (regular cap screw and flat and button type) while Allen nuts are cylindrical nuts internally threaded on one side with an Allen socket on the other. These fasteners are produced by different manufacturers and come in different styles, inch or Metric sizes, materials, finishes,  and coarse or fine threadings. They are offered as OEM parts or parts of AVIATIONEU NEW ERA product lines. Sold in pieces or packs of specified number of pieces per pack as designated by the number after the letters "PK" in the product reference code (SKU). 

Internal wrenching fasteners for aerospace applications are designed and intended for use in aircraft construction and repair and conform to Military or Aerospace Standards. Aerospace Industries Association Standard NASM 20004 through 20024 internal wrenching bolts supersede respective part numbers of MS 20004 through 20024 which in turn have superseeded those of older National Aerospace Standard NAS NAS 144 to 158 series. Fabricated from 160-180 ksi high-strength steel they are intended for use in both tension and shear applications. 

Socket screws for aerospace and military uses come in different sizes and meet aerospace/military standards including AN565 (superseded by NASM565), NAS1081, MS18063, MS18064, MS51021, MS51023, MS51029, MS51031, MS51038, MS51045, MS51963, MS51964, MS51965, MS51966. Those of AN565 (NASM565) standard are headless hex and fluted socket set screws while their MS51963 standard counterparts are cup point hex socket set screws.  Both are made of high-quality steel and they are designed to deliver maximum holding pressure Typically used to bind parts onto shafts. Available in cup or cone point styles, in different thread sizes and lengths in inches.

81791 internal wrenching  nuts are self-locking, high-strength, corrosion and oxidation resistant nuts made of nickel-chromium alloy with cadmium plating. These nuts are catalogued and supplied in different sizes as part numbers of TEXTRON AVIATION (separately listed).

For more information, please refer to the Product Description section, the supplied documentation or contact us.

A castellated nut, also referred to as a castle nut or slotted nut, is a nut with slots (notches) cut into one end. Although castellated nuts are frequently referred to as slotted nuts, there are slight differences. Castellated nuts are formed with a round section at the top where the slots are located. Slotted nuts do not have this rounded modification. The flat sides of slotted nuts extend fully from the top to the bottom of the nut. Both castellated and slotted nuts are designed to use a pin (usually a split pin) that fits through the slots and through a hole in the screw to which the nut is attached. This pin prevents the nut from turning and loosening. Compared with slotted nuts, castellated nuts allow the cotter pin to be confined closer to the margins of the nut itself, providing added secureness.

MS14144 Series nuts are slotted hexagon style lightweight castellated self locking nuts manufactured from steel and cadmium plated. They are offered as part of our own labelled (AVIATIONEU NEW ERA) product lines in different sizes with right-hand thread direction and a dry film lubricant as applicable, specified by the letter "L" in the part number.

Note: Depending on availability,these parts part may be supplied without or with Dry-Film Lubricant indicated by letter "L" in the SKU.

These nuts are for use in Textron Lycoming aircraft engines. Supplied with our own Certificate of Conformance. If additional certification is required, please contact us as a respective charge may apply.

HOWMET® AEROSPACE Inc. (formerly ARCONIC Inc.) develops & manufactures high performance, engineered products & solutions for the aerospace, industrial gas turbine, commercial transportation and oil and gas markets. ALCOA FASTENING SYSTEMS (ALCOA), now a business unit of  HOWMET® AEROSPACE is one of the largest manufacturers of aerospace hardware in the world.

SIMMONDS®, a HOWMET® AEROSPACE business unit, specialises on self-locking & special nuts. Their self locking nuts come in different types (series) offered in different materials and sizes, and can be reused at least 15 times without affecting the nut's performance. They are lightweight and extremely durable, exhibit a very strong locking performance & can be used in a wide temperature range.

SIMMONDS® Nylstop® Type P (Standard Version) & Type T (Low Profile Version) nylon locking nuts have been designed to stop nut and bolt disengagement during use. The internal nylon ring deforms around the threads as the nut is twisted on to the bolt, ensuring a tight, vibration resistant grip on the bolt.

SIMMONDS® PH Series Aerospace quality hexagonal self-locking nuts are small, thin walled, lightweight and extremely strong. Made from  A286 stainless steel (CRES) and silver plated these nutls are particularly useful when space and weight are at a premium. Used typically in engine applications, they are MJ threaded in Meric sizes M3-M12 to meet different applications requirements. 

SIMMONDS® SIMLOC® PH135M-ISO-MJ Series Hexagon Self-Locking Nuts are made of Alloy Steel 30CD4 or 35CD4 in accordance with TR 3791, heat treated for 40-43 HRC. They are Cadmium plated 5 µm mini in accordance with EN 2133 + Dry Film Lubricant in accordance with EN 2491. These lock nuts have an operating temperature up to 235°C and a 1100 MPa at ambient temperature. They are MJ threaded in accordance with ISO 5855-2 and comply with ISO 5858 standard qualification and acceptance conditions. They consist alternative parts for DIN LN 9338:2002-03 Aerospace Standard for hexagon self-locking washer nuts by various manufacturers. Offered nuts may be either parts of HOWMET SIMLOC® PH135M-ISO-MJ Series or parts conforming to DIN LN 9338:2002-03.

HM41/HM42 Series Flanged Self-Locking Nuts offered as part of HOWMET® AEROSPACE product portfolio. Made from A286 CRES per AMS 5732 or AMS 5735 specifications, they have Metric threads (M3 to M12) and are intended for use in temperatures up to 235 °C (HM42) or 425 °C (HM41). Tensile Stength 1100 Mpa. They are alternatives for DIN LN 9161 Standard nuts.

SIMMONDS® MHT Series are conical shaped self locking nuts, where the diameter of the upper part of the nut is slightly reduced. Six vertical slots open gradually whilst the nut is screwed onto the bolt. The elasticity of the particular shape of the nut will ensure the required locking torque.

For additional information on SIMMONDS® self locking nuts please refer to the Product Description section & the supplied documentation.