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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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About Nuts, Materials, and Finishes
More
Mil. Spec. Medium-Strength Steel Hex Nuts
Choose these nuts for their good corrosion resistance and adherence to strict military standards for material and construction. They're suitable for fastening most machinery and equipment.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Wd. | Ht. | Specifications Met | Pkg. Qty. | Pkg. | |
Cadmium Yellow-Chromate Plated Steel—Grade 5 | ||||||
|---|---|---|---|---|---|---|
| 1/4"-20 | 7/16" | 7/32" | MS51967-2; Fed. Spec. FF-N-836 | 25 | 000000000 | 000000 |
| 1/4"-28 | 7/16" | 7/32" | MS51968-2; Fed. Spec. FF-N-836 | 25 | 000000000 | 00000 |
| 5/16"-18 | 1/2" | 17/64" | MS51967-5; Fed. Spec. FF-N-836 | 25 | 000000000 | 00000 |
| 5/16"-24 | 1/2" | 17/64" | MS51968-5; Fed. Spec. FF-N-836 | 25 | 000000000 | 00000 |
| 3/8"-16 | 9/16" | 21/64" | MS51967-8; Fed. Spec. FF-N-836 | 10 | 000000000 | 0000 |
| 3/8"-24 | 9/16" | 21/64" | MS51968-8; Fed. Spec. FF-N-836 | 10 | 000000000 | 0000 |
| 7/16"-14 | 11/16" | 3/8" | MS51967-11; Fed. Spec. FF-N-836 | 5 | 000000000 | 0000 |
| 7/16"-20 | 11/16" | 3/8" | MS51968-11; Fed. Spec. FF-N-836 | 10 | 000000000 | 00000 |
| 1/2"-13 | 3/4" | 7/16" | MS51967-14; Fed. Spec. FF-N-836 | 10 | 000000000 | 00000 |
| 1/2"-20 | 3/4" | 7/16" | MS51968-14; Fed. Spec. FF-N-836 | 10 | 000000000 | 00000 |
| 9/16"-12 | 7/8" | 31/64" | MS51967-17; Fed. Spec. FF-N-836 | 5 | 000000000 | 00000 |
| 5/8"-11 | 15/16" | 35/64" | MS51967-20; Fed. Spec. FF-N-836 | 5 | 000000000 | 00000 |
| 5/8"-18 | 15/16" | 35/64" | MS51968-20; Fed. Spec. FF-N-836 | 5 | 000000000 | 00000 |
| 3/4"-10 | 1 1/8" | 41/64" | MS51967-23; Fed. Spec. FF-N-836 | 1 | 000000000 | 0000 |
| 3/4"-16 | 1 1/8" | 41/64" | MS51968-23; Fed. Spec. FF-N-836 | 5 | 000000000 | 00000 |
Mil. Spec. High-Strength Steel Hex Nuts
Choose these nuts for their adherence to strict military standards for material and construction. They're about 25% stronger than medium-strength steel nuts.
Cadmium yellow-chromate plated steel nuts resist corrosion in wet environments.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Wd. | Ht. | Specifications Met | Pkg. Qty. | Pkg. | |
Cadmium Yellow-Chromate Plated Steel—Grade 8 | ||||||
|---|---|---|---|---|---|---|
| 1/4"-20 | 7/16" | 7/32" | Fed. Spec. FF-N-836, MS51967-3 | 25 | 000000000 | 000000 |
| 1/4"-28 | 7/16" | 7/32" | Fed. Spec. FF-N-836, MS51968-3 | 25 | 000000000 | 00000 |
| 5/16"-18 | 1/2" | 17/64" | Fed. Spec. FF-N-836, MS51967-6 | 25 | 000000000 | 00000 |
| 5/16"-24 | 1/2" | 17/64" | Fed. Spec. FF-N-836, MS51968-6 | 25 | 000000000 | 00000 |
| 3/8"-16 | 9/16" | 21/64" | Fed. Spec. FF-N-836, MS51967-9 | 10 | 000000000 | 0000 |
| 3/8"-24 | 9/16" | 21/64" | Fed. Spec. FF-N-836, MS51968-9 | 10 | 000000000 | 0000 |
| 7/16"-14 | 11/16" | 3/8" | Fed. Spec. FF-N-836, MS51967-12 | 5 | 000000000 | 0000 |
| 7/16"-20 | 11/16" | 3/8" | Fed. Spec. FF-N-836, MS51968-12 | 5 | 000000000 | 0000 |
| 1/2"-13 | 3/4" | 7/16" | Fed. Spec. FF-N-836, MS51967-15 | 5 | 000000000 | 0000 |
| 1/2"-20 | 3/4" | 7/16" | Fed. Spec. FF-N-836, MS51968-15 | 5 | 000000000 | 0000 |
| 9/16"-18 | 7/8" | 31/64" | Fed. Spec. FF-N-836, MS51968-18 | 5 | 000000000 | 0000 |
| 5/8"-11 | 15/16" | 35/64" | Fed. Spec. FF-N-836, MS51967-21 | 5 | 000000000 | 00000 |
| 5/8"-18 | 15/16" | 35/64" | Fed. Spec. FF-N-836, MS51968-21 | 5 | 000000000 | 00000 |
| 3/4"-10 | 1 1/8" | 41/64" | Fed. Spec. FF-N-836, MS51967-24 | 1 | 000000000 | 0000 |
| 3/4"-16 | 1 1/8" | 41/64" | Fed. Spec. FF-N-836, MS51968-24 | 1 | 000000000 | 0000 |
Mil. Spec. Low-Strength Steel Hex Nuts
Choose these nuts for their good corrosion resistance and adherence to strict military standards for material and construction. About half the strength of medium-strength steel nuts, these nuts are for light duty fastening applications, such as securing access panels.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Wd. | Ht. | Specifications Met | Pkg. Qty. | Pkg. | |
Cadmium Yellow-Chromate Plated Steel | ||||||
|---|---|---|---|---|---|---|
| 2-56 | 3/16" | 1/16" | MS35649-222, Fed. Spec. FF-N-836 | 10 | 000000000 | 00000 |
| 4-40 | 1/4" | 3/32" | MS35649-242, Fed. Spec. FF-N-836 | 50 | 000000000 | 0000 |
| 6-32 | 5/16" | 7/64" | MS35649-262, Fed. Spec. FF-N-836 | 10 | 000000000 | 0000 |
| 8-32 | 11/32" | 1/8" | MS35649-282, Fed. Spec. FF-N-836 | 50 | 000000000 | 00000 |
| 10-24 | 3/8" | 1/8" | MS35649-202, Fed. Spec. FF-N-836 | 50 | 000000000 | 00000 |
| 10-32 | 3/8" | 1/8" | MS35650-302, Fed. Spec. FF-N-836 | 50 | 000000000 | 00000 |
| 1/4"-20 | 7/16" | 3/16" | MS35649-2252, Fed. Spec. FF-N-836 | 50 | 000000000 | 00000 |
| 5/16"-18 | 9/16" | 7/32" | MS35649-2312, Fed. Spec. FF-N-836 | 25 | 000000000 | 00000 |
| 3/8"-16 | 5/8" | 1/4" | MS35649-2382, Fed. Spec. FF-N-836 | 25 | 000000000 | 00000 |
Extreme-Strength Steel Hex Nuts—Grade 9
These nuts are about 20% stronger than high-strength steel nuts and are often used in heavy machinery, such as earth-moving equipment. They're cadmium yellow-chromate plated to resist corrosion in wet environments.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Wd. | Ht. | Pkg. Qty. | Pkg. | |
Cadmium Yellow-Chromate Plated Steel—Grade 9 | |||||
|---|---|---|---|---|---|
| 1/4"-20 | 7/16" | 17/64" | 50 | 000000000 | 000000 |
| 1/4"-28 | 7/16" | 17/64" | 50 | 000000000 | 0000 |
| 5/16"-18 | 1/2" | 5/16" | 25 | 000000000 | 0000 |
| 5/16"-24 | 1/2" | 5/16" | 25 | 000000000 | 0000 |
| 3/8"-16 | 9/16" | 25/64" | 25 | 000000000 | 0000 |
| 3/8"-24 | 9/16" | 25/64" | 25 | 000000000 | 00000 |
| 7/16"-14 | 11/16" | 7/16" | 10 | 000000000 | 0000 |
| 7/16"-20 | 11/16" | 7/16" | 10 | 000000000 | 0000 |
| 1/2"-13 | 3/4" | 17/32" | 10 | 000000000 | 0000 |
| 1/2"-20 | 3/4" | 17/32" | 10 | 000000000 | 0000 |
| 5/8"-11 | 15/16" | 11/16" | 5 | 000000000 | 0000 |
| 5/8"-18 | 15/16" | 11/16" | 5 | 000000000 | 0000 |
| 3/4"-10 | 1 1/8" | 25/32" | 1 | 000000000 | 0000 |
| 3/4"-16 | 1 1/8" | 25/32" | 1 | 000000000 | 0000 |
| 7/8"-9 | 1 5/16" | 55/64" | 1 | 000000000 | 0000 |
| 7/8"-14 | 1 5/16" | 55/64" | 1 | 000000000 | 0000 |
| 1"-8 | 1 1/2" | 1" | 1 | 000000000 | 00000 |
| 1"-14 | 1 1/2" | 1" | 1 | 000000000 | 00000 |
Mil. Spec. Low-Strength Steel Nylon-Insert Locknuts
Choose these locknuts for their adherence to strict military standards for material and construction. The nylon insert grips the bolt to resist loosening without damaging threads. These locknuts are reusable, but their holding power lessens with each use. A cadmium yellow-chromate plating provides corrosion resistance in wet environments and adds lubricity so they thread on smoothly.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Wd. | Ht. | Insert Max. Temp., °F | Specifications Met | Pkg. Qty. | Pkg. | |
Cadmium Yellow-Chromate Plated Steel | |||||||
|---|---|---|---|---|---|---|---|
| 4-40 | 1/4" | 5/32" | 250° | MS21044-N04 | 10 | 000000000 | 00000 |
| 6-32 | 5/16" | 3/16" | 250° | MS21044-N06 | 10 | 000000000 | 0000 |
| 8-32 | 11/32" | 9/32" | 250° | MS21044-N08 | 10 | 000000000 | 0000 |
| 10-32 | 3/8" | 9/32" | 250° | MS21044-N3 | 10 | 000000000 | 0000 |
| 1/4"-28 | 7/16" | 23/64" | 250° | MS21044-N4 | 10 | 000000000 | 0000 |
| 5/16"-24 | 1/2" | 23/64" | 250° | MS21044-N5 | 5 | 000000000 | 00000 |
| 3/8"-24 | 9/16" | 15/32" | 250° | MS21044-N6 | 5 | 000000000 | 00000 |
| 1/2"-20 | 3/4" | 19/32" | 250° | MS21044-N8 | 5 | 000000000 | 0000 |
| 5/8"-18 | 15/16" | 3/4" | 250° | MS21044-N10 | 1 | 000000000 | 0000 |
Mil. Spec. Low-Strength Steel Thin Nylon-Insert Locknuts
Choose these locknuts for their adherence to strict military standards for material and construction. About half the height of standard nylon-insert locknuts, use them in light duty low-clearance applications or jam one against a hex nut to hold it in place. The nylon insert grips the bolt to resist loosening without damaging threads. They're reusable, but their holding power lessens with each use. A cadmium yellow-chromate plating provides corrosion resistance in wet environments and adds lubricity so they thread on smoothly.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Wd. | Ht. | Insert Max. Temp., °F | Specifications Met | Pkg. Qty. | Pkg. | |
Cadmium Yellow-Chromate Plated Steel | |||||||
|---|---|---|---|---|---|---|---|
| 4-40 | 1/4" | 1/8" | 250° | MS21083N04, NASM21083 | 10 | 000000000 | 000000 |
| 6-32 | 5/16" | 9/64" | 250° | MS21083N06, NASM21083 | 10 | 000000000 | 00000 |
| 8-32 | 11/32" | 3/16" | 250° | MS21083N08, NASM21083 | 10 | 000000000 | 0000 |
| 10-32 | 3/8" | 3/16" | 250° | MS21083N3, NASM21083 | 10 | 000000000 | 0000 |
| 1/4"-28 | 7/16" | 7/32" | 250° | MS21083N4, NASM21083 | 10 | 000000000 | 0000 |
| 1/2"-20 | 3/4" | 5/16" | 250° | MS21083N8, NASM21083 | 1 | 000000000 | 0000 |
Mil. Spec. Steel Flex-Top Locknuts for Heavy Vibration
Choose these locknuts for their adherence to strict military standards for material and construction. Threads at the top of the nut expand to grip the bolt on all sides for a stronger hold than distorted-thread locknuts. The strength of the bolt should match the strength of the nut to prevent damaging threads. These locknuts have equivalent strength to Grade 8 steel locknuts. A cadmium yellow-chromate plating provides corrosion resistance in wet environments and adds lubricity so they thread on smoothly.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Wd. | Ht. | Specifications Met | Pkg. Qty. | Pkg. | |
Cadmium Yellow-Chromate Plated Steel | ||||||
|---|---|---|---|---|---|---|
| 4-40 | 1/4" | 5/32" | MS21045-04 | 5 | 000000000 | 00000 |
| 6-32 | 5/16" | 3/16" | MS21045-06 | 5 | 000000000 | 0000 |
| 8-32 | 11/32" | 1/4" | MS21045-08 | 5 | 000000000 | 00000 |
| 10-32 | 3/8" | 1/4" | MS21045-3 | 5 | 000000000 | 0000 |
| 1/4"-28 | 7/16" | 5/16" | MS21045-4 | 5 | 000000000 | 0000 |
| 5/16"-24 | 1/2" | 23/64" | MS21045-5 | 5 | 000000000 | 00000 |
| 3/8"-24 | 9/16" | 15/32" | MS21045-6 | 5 | 000000000 | 00000 |
| 7/16"-20 | 11/16" | 15/32" | MS21045-7 | 1 | 000000000 | 0000 |
| 1/2"-20 | 3/4" | 39/64" | MS21045-8 | 1 | 000000000 | 0000 |
| 9/16"-18 | 7/8" | 11/16" | MS21045-9 | 1 | 000000000 | 00000 |
| 5/8"-18 | 15/16" | 49/64" | MS21045-10 | 1 | 000000000 | 00000 |
| 3/4"-16 | 1 1/16" | 57/64" | MS21045-12 | 1 | 000000000 | 00000 |
Mil. Spec. Low-Strength Steel Distorted-Thread Flange Locknuts
Choose these flange locknuts for their adherence to strict military standards for material and construction. They have an irregularly-shaped thread that grips the bolt for a stronger hold than nylon-insert flange locknuts. A flange that distributes pressure where the nut meets the material surface, eliminating the need for a separate washer. They're not reusable. A cadmium yellow-chromate plating provides corrosion resistance in wet environments. Height includes the flange.
Locknuts with lubricant keep screws from binding to the locknuts while you tighten them. They’re often used with screws made from soft metals, such as aluminum, which are more likely to bind to the locknuts than harder materials such as steel.
For technical drawings and 3-D models, click on a part number.
Flange | Locknuts | Locknuts with Lubricant | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Thread Size | Wd. | Ht. | Dia. | Thick. | Pkg. Qty. | Specifications Met | Pkg. | Specifications Met | Pkg. | ||
Cadmium Yellow-Chromate Plated Steel | |||||||||||
| 2-56 | 1/8" | 3/32" | 0.167" | 0.01" | 5 | MS21042-02 | 000000000 | 00000 | MS21042L-02 | 000000000 | 000000 |
| 4-40 | 5/32" | 1/8" | 0.206" | 0.03" | 5 | MS21042-04 | 000000000 | 0000 | MS21042L-04 | 000000000 | 0000 |
| 6-32 | 3/16" | 9/64" | 0.244" | 0.03" | 5 | MS21042-06 | 000000000 | 0000 | MS21042L-06 | 000000000 | 0000 |
| 8-32 | 7/32" | 3/16" | 0.29" | 0.03" | 5 | MS21042-08 | 000000000 | 0000 | MS21042L-08 | 000000000 | 0000 |
| 10-32 | 1/4" | 3/16" | 0.33" | 0.03" | 5 | MS21042-3 | 000000000 | 0000 | MS21042L-3 | 000000000 | 0000 |
| 1/4"-28 | 5/16" | 7/32" | 0.42" | 0.04" | 5 | MS21042-4 | 000000000 | 0000 | MS21042L-4 | 000000000 | 0000 |
| 5/16"-24 | 3/8" | 17/64" | 0.52" | 0.04" | 1 | MS21042-5 | 000000000 | 0000 | MS21042L-5 | 000000000 | 0000 |
| 3/8"-24 | 7/16" | 9/32" | 0.62" | 0.04" | 1 | MS21042-6 | 000000000 | 0000 | MS21042L-6 | 000000000 | 0000 |
Nylon-Insert Press-Fit Locknuts for Sheet Metal
These press-fit nuts have a nylon insert that grips threads to resist loosening and knurls on the bottom of the nut that hold them firmly in place. Press them into a drilled or punched hole with an installation tool or an arbor press. Installation requires access to both sides of the panel.
Cadmium yellow-chromate plated steel locknuts resist corrosion in wet environments.
For technical drawings and 3-D models, click on a part number.