Textron Lycoming Engine Part. Available also as a Certified Part at additional charge.

AN316 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 Series jam nuts are thinner than the AN315 specification nuts for use in tighter installations. AN316 hex check nuts can carry half the tension load of the AN315 nut.

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 Superseded by NASM316.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.

AN315 Series hex plain nuts are manufactured from steel and cadmium plated per QQ-P-416A, Type II, Class 3. 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. 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

Floating nut plates are low profile and lightweight plates used to install a captive nut behind a panel. The floating nut allows for an assembly that is not perfectly aligned. These lightweight, low-profile nut plates are designed for blind mounted applications where it is impractical to use hex nuts or where it is desirable to have an attached nut for ease of maintenance. F5000/MS21059 Series floating  two-lug nut plates are made of carbon steel or alloy steel and are cadmium plated.  They are superseded by NASM21059 series.

Floating nut plates are low profile and lightweight plates used to install a captive nut behind a panel. The floating nut allows for an assembly that is not perfectly aligned. MF5000/MS21075 Series miniature floating two-lug plate nut from carbon steel, cadmium plated. Similar to F5000 series but with a reduced rivet spacing. They are superseded by NASM21075 series.

K1000 series full size fixed self-locking two-lug nutplates (*) by Arconic are made from cadmium plated carbon steel. and are available in different thread sizes, with plain rivet or countersunk rivet holes with or without a dry film lube. They comform with MS21047, NAS680, NAS1023A specifications. MS21047 nutplates are superseded by NASM21047 series. 

Nutplates with a dry film lube are specified by the letter "L" in the part number.

Nutplates with countersunk rivet holes are specified by the letter "K" in the end of the part number.

Certification Details:

MS21047F, MILITARY SPECIFICATION SHEET: Nut, Self-Locking, Plate, Two Lug, Floating, Low Height Steel, 125 KSI FTU, 450 Deg. F (01 Feb 1994) [Superseded by NASM21047].

Note (*): A plate nut, also known as a nut plate, anchor nut or anchor plate, is a stamped sheet metal nut that is usually riveted to a workpiece. They have a long tube that is internally threaded and a plate with two clearance holes for rivets.

Anchor nuts are designed for blind mounted applications where it is impractical to use hex nuts or where it is desirable to have an attached nut for ease of maintenance. MS21069/MS21070 Series are fixed self-locking, two lug, reduced rivet spacing low height miniature nutplates (*). MS21069 series are manufactured from cadmium plated steel while MS21070 nutplates are produced from corrosion resistant steel. They are available in different thread sizes, with plain or countersunk rivet holes on each side and come with or without a dry film lube. Nutplates with a dry film lube are specified by the letter "L" in the part number. Nutplates with countersunk rivet holes are specified by the letter "K" at the end of the part number. MS21069/MS21070 Series are superseded by NASM21069/NASM21070 series respectively.

Note (*): A plate nut, also known as a nut plate, anchor nut or anchor plate, is a stamped sheet metal nut that is usually riveted to a workpiece. They have a long tube that is internally threaded and a plate with two clearance holes for rivets.

AN310 and AN320 Series castlellated nuts are manufactured from steel and cadmium plated. These nuts have been superseded by NASM310/320 Series.  The Part Identification Numbers (PIN) for AN310/AN320 and those for NASM310/NASM320 are identical.

Castellated nuts are of similar style and shape as castle nuts but they are not as thick (deep) as the castle nuts (they consist the thin version of standard castle nuts). The thin design makes castlellated nuts weaker than the castle nuts and are used only where shear stress forces are encountered. Fabricated from steel and cadmium plated per QQ-P-416A, Type II, Class 3. AN310 castle nuts are used with drilled-shank bolts, clevis bolts, eye bolts and studs. The slots in the nut accommodate a cotter pin for safety purposes. The thinner AN320 series castellated shear nuts, with half the tensile rating of the AN310 series nuts, are used with clevis bolts and threaded taper pins which are subject to shearing stress only.

The AN363 all-metal stop nuts are designed for use in high temp installations (up to 450°F). Fabricated from cadmium plated steel per specification QQ-P-416C or stainless steel when the letter "C" is included after the series number (e.g. AN363 cadmium plated, AN363C stainless steel). AN363/ AN363C nuts have been repaced by MS21045/MS21046C which in turn are superseded by NASM21045/NASM21046C. The Part Identification Number (PIN) for MS21045/MS21046C  and the part number for NASM21045/NASM21046C nuts are identical. The part numbers have not been changed (eg. AN363-1032 σε MS21045-3 σε NASM21045-3).

NASM21083/MS21083/AN364 series hexagonal low height self-locking  nuts with elastic insert are intended for use in structural applications. Fabricated from different materials and finishes (cadmium plated steel, corrosion resistant steel passivated, aluminum alloy anodized) indicated by the following letters after their series number:

Letter “A” after dash number for nuts having non-metallic inserts

Letter "C" corrosion resistance (stainless) steel CRES passivated

Letter "B" brass

Letter "D" aluminum alloy anodized

Letter "N" cadmium plated steel

Cad plated nuts are furnished to military specifications while stainless steel nuts are furnished to military specification and commercial grade. AN364 nuts have been repaced by MS21083 which in turn are superseded by NASM21083. The Part Identification Number (PIN) for MS21083 and the part number for NASM21083 nuts are identical. The part numbers have not been changed.

AN365 self locking nuts are intended for use in structural applications where the regular height is required. These precision-made nuts are reliable and economical fastening devices The fiber insert gives a friction grip on the threads of the bolt and holds securely. Fabricated from cadmium plated or stainless steel when the letter "C" is included after the series number (e.g. AN365 cadmium plated, AN365C stainless steel). Cad plated nuts are furnished to military specifications while stainless steel nuts are furnished to military specification and commercial grade. AN365 nuts have been repaced by MS21044 which in turn are superseded by NASM21044. The Part Identification Number (PIN) for MS21044 and the part number for NASM21044 nuts are identical. The part numbers have not been changed.

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 widely used throughout the aerospace industry together with MS21043 (superseded by NASM21043 series) all-metal reduced hexagon, reduced height self-locking nuts with a ring base made of corrosion resistance steel and silver plated. 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 (Lubed) indicated by the letter "L" in their part number. NASM21042/MS21042 and NASM21043/MS21043 series are used to replace certain versions of older NAS1291 series thin-walled reduced height self-locking nuts, made of corrosion resisting (stainless) steel or cadmium plated alloy steel (see product presentation).

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

U-Type Tinnerman Nut for Type B Sheet Metal Screw. Spring Steel, Heat Treated.