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.

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.

HI-SHEAR Fasteners are patented fasteners of HI-SHEAR CORPORATION (Patent Holder), subsidiary of LISI AEROSPACE, a manufacturer of advanced aerospace fasteners and installation equipment used in space, military and commercial vehicles. Depending on the fastener, they are made by quality fastener manufacturers (licensees) in different  countries including but not limited to LISI AEROSPACE companies, HOWMET ALCOA / SIMMONDS / FAIRCHILD, PCC  SPS, and others. 

HI-SHEAR nuts and collars are designed to fit with their related HI-LOK™/HI-TIGUE™ and HI-LITE™ pins  (separately presented) forming the respective fastener system. HI-LOK™ nuts and collars are designed to fit HI-LOK™ & HI-TIGUE™ pins. HI-LITE™ nuts and collars are designed to fit HI-LITE™, PULL-IN™, PULL-STEM™ & TAPER HI-LITE™ pins.

With a wide range of shapes, materials and coatings, they are suited for most of structural assemblies and are commonly used in the aerospace industry in tension and shear applications. Collars’ wrenching element is designed to break-away at a controlled preload. It has been tested over time and has proven its reliability when installed with non-torque-controlled tools. Main features of nuts and collars include:

- controlled preload

- wide variety of materials and coatings for installation in all structures

- suitable for shear or tension applications, with captive washer, self-aligning or self-sealing options

- limited access installation, using conventional tooling

- designed with a counterbore to fit nominal and oversized pins

- nuts allow customized torque and preload & low height design for low access areas

Please refer to the supplied documentation for additional information.

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.

NAFCO USA is a manufacturer of self-locking nuts as well as different types of nutplates and press-in inserts and dome nuts. Their fasteners conform with National Aerospace Standards (NAS) developed and maintained by the U.S. Aerospace Industries Association (AIA) and served as the foundation for the development of aircraft, spacecraft, watercraft, ground vehicles, machinery, and electronics. The NA prefix in the part numbers of the fasteners relates to metric standards.

In the world of aerospace fasteners NAFCO USA has built a reputation for quality, affordable, and innovative products. NAFCO USA’s stressnut rivetless nutplates, are no exception. Their stressnut rivetless nutplates meet and exceed the requirements of aerospace standard NASM25027 and offer high resistance to push-out and torque. In addition, the rivetless design eliminates the need for additional drilled holes and rivet installation, allowing faster installation times. Time savings on installation translates into reduced labor costs. Other Features Include:

Increase substrate fatigue life up to 300%.

Installed with convenient split sleeve tooling.

Replaceable nut elements (NAS1794 standard).

Inch or metric unit versions.

Sealed or unsealed versions.

Do not require gang channels.

Reduced profile/weight versions available.

MONADNΟCK floating clip nuts  are high strength forged hex nuts suitable for structural and non-structural applications in metal, plastic and composite materials. Made of carbon steel, heat treated, cad plated per QQ-P-416, type II, class 2.

Brass nuts for mounting of aircraft instruments from the front of the panel.