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Choose a hex nut with the right profile, material, and strength for your application.
Mil. Spec. Thin-Profile Hex Nuts
Corrosion-Resistant Stainless Steel
 |
18-8 Stainless Steel—The choice for wet and outdoor environments, these nuts resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.
Thread Size | Wd. | Ht. | Mil. Spec. | Certificate Type | Pkg. Qty. | Pkg. | |||
|---|---|---|---|---|---|---|---|---|---|
18-8 Stainless Steel | |||||||||
| 1/4"-20 | 7/16" | 5/32" | Fed. Spec. FF-N-836, MS35691-3 | Material Certificate | 5 | 92101A210 | 000000 | ||
| 1/4"-28 | 7/16" | 5/32" | Fed. Spec. FF-N-836, MS35691-7 | — | 1 | 92101A320 | 0000 | ||
| 5/16"-18 | 1/2" | 3/16" | Fed. Spec. FF-N-836, MS35691-11 | Material Certificate | 5 | 92101A430 | 00000 | ||
| 5/16"-24 | 1/2" | 3/16" | Fed. Spec. FF-N-836, MS35691-15 | — | 5 | 92101A540 | 00000 | ||
| 3/8"-16 | 9/16" | 7/32" | Fed. Spec. FF-N-836, MS35691-19 | — | 1 | 92101A650 | 0000 | ||
| 3/8"-24 | 9/16" | 7/32" | Fed. Spec. FF-N-836, MS35691-23 | Material Certificate | 1 | 92101A760 | 0000 | ||
| 7/16"-14 | 11/16" | 1/4" | Fed. Spec. FF-N-836, MS35691-27 | Material Certificate | 1 | 92101A101 | 00000 | ||
| 7/16"-20 | 11/16" | 1/4" | Fed. Spec. FF-N-836, MS35691-31 | — | 1 | 92101A102 | 0000 | ||
| 1/2"-13 | 3/4" | 5/16" | Fed. Spec. FF-N-836, MS35691-35 | Material Certificate | 1 | 92101A870 | 0000 | ||
| 1/2"-20 | 3/4" | 5/16" | Fed. Spec. FF-N-836, MS35691-39 | Material Certificate | 1 | 92101A980 | 0000 | ||
| 5/8"-11 | 15/16" | 3/8" | Fed. Spec. FF-N-836, MS35691-51 | — | 1 | 92101A103 | 00000 | ||
| 5/8"-18 | 15/16" | 3/8" | Fed. Spec. FF-N-836, MS35691-55 | — | 1 | 92101A104 | 00000 | ||
Mil. Spec. Thin-Profile Nylon-Insert Locknuts
These locknuts are manufactured and tested to strict U.S. military standards for material and construction. They are about half the height of standard-profile locknuts to fit in spaces with low clearance. You can also use them as jam nuts by threading them against a hex nut to hold it in place. The nylon insert grips the screw to prevent loosening from moderate vibration without damaging threads. However, the insert may become brittle if exposed to high temperatures. These locknuts are reusable a handful of times, but the holding power decreases with each use.
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Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.
Low-Strength Steel
 |
Rated Grade 2, Class 6, or lower, these locknuts are about half as strong as medium-strength steel nuts. Use them with screws that have a similar strength rating to avoid stripping threads during installation.
Cadmium Yellow-Chromate-Plated Steel—These locknuts have good lubricity to thread on smoothly and ease installation. The plating also creates a barrier against rust that's comparable to zinc-yellow-chromate plating.
Thread Size | Wd. | Ht. | Mil. Spec. | Insert Max. Temp., ° F | Certificate Type | Pkg. Qty. | Pkg. | |||
|---|---|---|---|---|---|---|---|---|---|---|
Cadmium Yellow-Chromate-Plated Steel | ||||||||||
| 4-40 | 1/4" | 1/8" | MS21083N04, NASM21083 | 250 | Material Certificate | 10 | 95496A310 | 000000 | ||
| 6-32 | 5/16" | 9/64" | MS21083N06, NASM21083 | 250 | Material Certificate | 10 | 95496A320 | 00000 | ||
| 8-32 | 11/32" | 3/16" | MS21083N08, NASM21083 | 250 | Material Certificate | 10 | 95496A330 | 0000 | ||
| 10-32 | 3/8" | 3/16" | MS21083N3, NASM21083 | 250 | Material Certificate | 10 | 95496A340 | 0000 | ||
| 1/4"-28 | 7/16" | 7/32" | MS21083N4, NASM21083 | 250 | Material Certificate | 10 | 95496A350 | 0000 | ||
| 1/2"-20 | 3/4" | 5/16" | MS21083N8, NASM21083 | 250 | Material Certificate | 1 | 95496A380 | 0000 | ||
Corrosion-Resistant Stainless Steel
|
18-8 Stainless Steel—The choice for wet and outdoor environments, these locknuts resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.
Thread Size | Wd. | Ht. | Mil. Spec. | Insert Max. Temp., ° F | Certificate Type | Pkg. Qty. | Pkg. | |||
|---|---|---|---|---|---|---|---|---|---|---|
18-8 Stainless Steel | ||||||||||
| 2-56 | 1/4" | 7/64" | MS21083C02, NASM21083 | 250 | Material Certificate | 5 | 97231A480 | 000000 | ||
| 4-40 | 1/4" | 1/8" | MS21083C04, NASM21083 | 250 | Material Certificate | 10 | 97231A410 | 00000 | ||
| 6-32 | 5/16" | 9/64" | MS21083C06, NASM21083 | 250 | Material Certificate | 10 | 97231A420 | 00000 | ||
| 8-32 | 11/32" | 3/16" | MS21083C08, NASM21083 | 250 | Material Certificate | 5 | 97231A430 | 0000 | ||
| 10-32 | 3/8" | 3/16" | MS21083C3, NASM21083 | 250 | Material Certificate | 5 | 97231A440 | 00000 | ||
| 1/4"-28 | 7/16" | 7/32" | MS21083C4, NASM21083 | 250 | Material Certificate | 5 | 97231A450 | 00000 | ||
| 5/16"-24 | 1/2" | 17/64" | MS21083C5, NASM21083 | 250 | Material Certificate | 1 | 97231A460 | 0000 | ||
| 3/8"-24 | 9/16" | 9/32" | MS21083C6, NASM21083 | 250 | Material Certificate | 1 | 97231A470 | 0000 | ||
| 7/16"-20 | 11/16" | 21/64" | MS21083C7, NASM21083 | 250 | Material Certificate | 1 | 97231A510 | 00000 | ||
| 1/2"-20 | 3/4" | 5/16" | MS21083C8, NASM21083 | 250 | Material Certificate | 1 | 97231A490 | 00000 | ||
| 5/8"-18 | 15/16" | 13/32" | MS21083C10, NASM21083 | 250 | Material Certificate | 1 | 97231A520 | 00000 | ||
