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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 | |||||||||
---|---|---|---|---|---|---|---|---|---|
Thread Size | Wd. | Ht. | Dia. | Thick. | Specifications Met | Includes | Pkg. Qty. | Pkg. | |
Cadmium Yellow-Chromate Plated Steel | |||||||||
2-56 | 1/8" | 3/32" | 0.167" | 0.01" | MS21042-02 | __ | 5 | 000000000 | 000000 |
4-40 | 5/32" | 1/8" | 0.206" | 0.03" | MS21042-04 | __ | 5 | 000000000 | 0000 |
6-32 | 3/16" | 9/64" | 0.244" | 0.03" | MS21042-06 | __ | 5 | 000000000 | 0000 |
8-32 | 7/32" | 3/16" | 0.29" | 0.03" | MS21042-08 | __ | 5 | 000000000 | 0000 |
10-32 | 1/4" | 3/16" | 0.33" | 0.03" | MS21042-3 | __ | 5 | 000000000 | 0000 |
1/4"-28 | 5/16" | 7/32" | 0.42" | 0.04" | MS21042-4 | __ | 5 | 000000000 | 0000 |
5/16"-24 | 3/8" | 17/64" | 0.52" | 0.04" | MS21042-5 | __ | 1 | 000000000 | 0000 |
3/8"-24 | 7/16" | 9/32" | 0.62" | 0.04" | MS21042-6 | __ | 1 | 000000000 | 0000 |
Cadmium-Plated Steel | |||||||||
2-56 | 1/8" | 3/32" | 0.167" | 0.01" | MS21042L-02 | Lubricant | 5 | 000000000 | 00000 |
4-40 | 5/32" | 1/8" | 0.206" | 0.03" | MS21042L-04 | Lubricant | 5 | 000000000 | 0000 |
6-32 | 3/16" | 9/64" | 0.244" | 0.03" | MS21042L-06 | Lubricant | 5 | 000000000 | 0000 |
8-32 | 7/32" | 3/16" | 0.29" | 0.03" | MS21042L-08 | Lubricant | 5 | 000000000 | 0000 |
10-32 | 1/4" | 3/16" | 0.33" | 0.03" | MS21042L-3 | Lubricant | 5 | 000000000 | 0000 |
1/4"-28 | 5/16" | 7/32" | 0.42" | 0.04" | MS21042L-4 | Lubricant | 5 | 000000000 | 0000 |
5/16"-24 | 3/8" | 17/64" | 0.52" | 0.04" | MS21042L-5 | Lubricant | 1 | 000000000 | 0000 |
3/8"-24 | 7/16" | 9/32" | 0.62" | 0.04" | MS21042L-6 | Lubricant | 1 | 000000000 | 0000 |
Metric High-Strength Steel Distorted-Thread Flange Locknuts—Class 10
Grip metric bolts more securely than nylon-insert flange locknuts—the irregularly shaped threads on these locknuts hold extra tight. They resist vibration and sudden shocks, even after multiple uses. Thanks to their flange, these nuts distribute pressure across a greater area than standard nuts, so you don’t need to add a washer. However, they may not fit in tight spaces. Made of high-strength, Class 10 steel, these nuts are about 25% stronger than medium-strength steel flange nuts. Their strength is comparable to Class 10.9 bolts.
These flange nuts meet DIN and ISO dimensional standards that confirm their compatibility with other parts and tools. ISO 7044 is functionally equivalent to DIN 1664 (formerly DIN 6927).
Black-oxide steel flange nuts mildly resist corrosion and have a dark surface color.
Zinc-plated steel flange nuts resist corrosion, extending their life.
For technical drawings and 3-D models, click on a part number.
Thread | Flange | ||||||||
---|---|---|---|---|---|---|---|---|---|
Size | Pitch, mm | Wd., mm | Ht., mm | Dia., mm | Thick., mm | Specifications Met | Pkg. Qty. | Pkg. | |
Black-Oxide Steel—Class 10 | |||||||||
M6 | 1 | 10 | 7.3 | 14.2 | 1.1 | DIN 1664, DIN 6927, ISO 7044 | 25 | 0000000 | 00000 |
M8 | 1.25 | 13 | 9.4 | 17.9 | 1.2 | DIN 1664, DIN 6927, ISO 7044 | 10 | 0000000 | 0000 |
M10 | 1.5 | 15 | 11.4 | 21.8 | 1.5 | DIN 1664, DIN 6927, ISO 7044 | 10 | 0000000 | 0000 |
M12 | 1.75 | 18 | 13.8 | 26 | 1.8 | DIN 1664, DIN 6927, ISO 7044 | 10 | 0000000 | 0000 |
M14 | 2 | 21 | 15.9 | 29.9 | 2.1 | DIN 1664, DIN 6927, ISO 7044 | 5 | 0000000 | 0000 |
M16 | 2 | 24 | 18.3 | 34.5 | 2.4 | DIN 1664, DIN 6927, ISO 7044 | 1 | 0000000 | 0000 |
Zinc-Plated Steel—Class 10 | |||||||||
M6 | 1 | 10 | 7.3 | 14.2 | 1.1 | DIN 1664, DIN 6927, ISO 7044 | 50 | 0000000 | 00000 |
M8 | 1.25 | 13 | 9.4 | 17.9 | 1.2 | DIN 1664, DIN 6927, ISO 7044 | 25 | 0000000 | 00000 |
M10 | 1.5 | 15 | 11.4 | 21.8 | 1.5 | DIN 1664, DIN 6927, ISO 7044 | 10 | 0000000 | 0000 |
M12 | 1.75 | 18 | 13.8 | 26 | 1.8 | DIN 1664, DIN 6927, ISO 7044 | 10 | 0000000 | 00000 |
M14 | 2 | 21 | 15.9 | 29.9 | 2.1 | DIN 1664, DIN 6927, ISO 7044 | 5 | 0000000 | 00000 |
M16 | 2 | 24 | 18.3 | 34.5 | 2.4 | DIN 1664, DIN 6927, ISO 7044 | 1 | 0000000 | 0000 |
M20 | 2.5 | 30 | 22.4 | 42.8 | 3 | DIN 1664, DIN 6927, ISO 7044 | 1 | 0000000 | 0000 |
High-Strength Steel Distorted-Thread Flange Locknuts
An irregularly-shaped thread grips the bolt for a stronger hold than nylon-insert flange locknuts. They have a flange that distributes pressure where the nut meets the material surface, eliminating the need for a separate washer. Grade G locknuts are comparable in strength to Grade 8 bolts. Height includes the flange.
Black-oxide steel locknuts are mildly corrosion resistant.
Zinc yellow-chromate plated steel locknuts resist corrosion in wet environments.
For technical drawings and 3-D models, click on a part number.
Flange | |||||||
---|---|---|---|---|---|---|---|
Thread Size | Wd. | Ht. | Dia. | Thick. | Pkg. Qty. | Pkg. | |
Black-Oxide Steel—Grade G | |||||||
1/4"-20 | 7/16" | 19/64" | 9/16" | 0.04" | 50 | 000000000 | 000000 |
1/4"-28 | 7/16" | 19/64" | 9/16" | 0.04" | 50 | 000000000 | 00000 |
5/16"-18 | 1/2" | 23/64" | 11/16" | 0.05" | 25 | 000000000 | 00000 |
5/16"-24 | 1/2" | 23/64" | 11/16" | 0.05" | 25 | 000000000 | 00000 |
3/8"-16 | 9/16" | 27/64" | 13/16" | 0.06" | 25 | 000000000 | 00000 |
3/8"-24 | 9/16" | 27/64" | 13/16" | 0.06" | 25 | 000000000 | 00000 |
1/2"-13 | 3/4" | 9/16" | 1 1/16" | 0.08" | 10 | 000000000 | 00000 |
1/2"-20 | 3/4" | 9/16" | 1 1/16" | 0.08" | 10 | 000000000 | 00000 |
5/8"-11 | 15/16" | 11/16" | 1 21/64" | 0.1" | 10 | 000000000 | 00000 |
5/8"-18 | 15/16" | 11/16" | 1 21/64" | 0.1" | 10 | 000000000 | 00000 |
3/4"-10 | 1 1/8" | 13/16" | 1 37/64" | 0.11" | 5 | 000000000 | 00000 |
Black-Phosphate Steel—Grade G | |||||||
1/4"-20 | 7/16" | 19/64" | 9/16" | 0.04" | 100 | 000000000 | 0000 |
1/4"-28 | 7/16" | 19/64" | 9/16" | 0.04" | 100 | 000000000 | 0000 |
5/16"-18 | 1/2" | 23/64" | 11/16" | 0.05" | 100 | 000000000 | 00000 |
5/16"-24 | 1/2" | 23/64" | 11/16" | 0.05" | 100 | 000000000 | 00000 |
3/8"-16 | 9/16" | 27/64" | 13/16" | 0.06" | 50 | 000000000 | 00000 |
3/8"-24 | 9/16" | 27/64" | 13/16" | 0.06" | 25 | 000000000 | 00000 |
1/2"-13 | 3/4" | 9/16" | 1 1/16" | 0.08" | 25 | 000000000 | 00000 |
1/2"-20 | 3/4" | 9/16" | 1 1/16" | 0.08" | 25 | 000000000 | 0000 |
5/8"-11 | 15/16" | 11/16" | 1 21/64" | 0.1" | 10 | 000000000 | 00000 |
5/8"-18 | 15/16" | 11/16" | 1 21/64" | 0.1" | 10 | 000000000 | 0000 |
3/4"-10 | 1 1/8" | 53/64" | 1 37/64" | 0.11" | 10 | 000000000 | 00000 |
3/4"-16 | 1 1/8" | 53/64" | 1 37/64" | 0.11" | 10 | 000000000 | 0000 |
7/8"-9 | 1 5/16" | 51/64" | 1 3/4" | 0.12" | 5 | 000000000 | 00000 |
7/8"-14 | 1 5/16" | 51/64" | 1 3/4" | 0.12" | 5 | 000000000 | 00000 |
1"-8 | 1 1/2" | 57/64" | 2 1/16" | 0.13" | 5 | 000000000 | 00000 |
1"-14 | 1 1/2" | 57/64" | 2 1/16" | 0.13" | 5 | 000000000 | 00000 |
Zinc Yellow-Chromate Plated Steel—Grade G | |||||||
1/4"-20 | 7/16" | 19/64" | 9/16" | 0.04" | 50 | 000000000 | 00000 |
1/4"-28 | 7/16" | 19/64" | 9/16" | 0.04" | 50 | 000000000 | 00000 |
5/16"-18 | 1/2" | 23/64" | 11/16" | 0.05" | 25 | 000000000 | 00000 |
5/16"-24 | 1/2" | 23/64" | 11/16" | 0.05" | 25 | 000000000 | 00000 |
3/8"-16 | 9/16" | 27/64" | 13/16" | 0.06" | 25 | 000000000 | 00000 |
3/8"-24 | 9/16" | 27/64" | 13/16" | 0.06" | 25 | 000000000 | 00000 |
1/2"-13 | 3/4" | 9/16" | 1 1/16" | 0.08" | 10 | 000000000 | 0000 |
1/2"-20 | 3/4" | 9/16" | 1 1/16" | 0.08" | 10 | 000000000 | 00000 |
5/8"-11 | 15/16" | 11/16" | 1 21/64" | 0.1" | 10 | 000000000 | 00000 |
5/8"-18 | 15/16" | 11/16" | 1 21/64" | 0.1" | 10 | 000000000 | 00000 |
3/4"-10 | 1 1/8" | 13/16" | 1 37/64" | 0.11" | 5 | 000000000 | 00000 |
Metric Medium-Strength Steel Distorted-Thread Flange Locknuts—Class 8
With irregularly-shaped threads, these metric locknuts grip the bolt for a stronger hold than nylon-insert flange locknuts and resist loosening from vibration. The flange distributes pressure on the material surface, so you don’t need a separate washer. Made from Class 8 steel, these locknuts are a good choice for fastening most machinery and equipment. They’re zinc plated, so they resist corrosion in wet environments.
For technical drawings and 3-D models, click on a part number.
Thread | Flange | ||||||||
---|---|---|---|---|---|---|---|---|---|
Size | Pitch, mm | Wd., mm | Ht., mm | Dia., mm | Thick., mm | Specifications Met | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel—Class 8 | |||||||||
M5 | 0.8 | 8 | 6.2 | 11.8 | 1 | DIN 6927 | 50 | 000000000 | 00000 |
M6 | 1 | 10 | 7.3 | 14.2 | 1.1 | DIN 6927 | 50 | 000000000 | 00000 |
M8 | 1.25 | 13 | 9.4 | 17.9 | 1.2 | DIN 6927 | 50 | 000000000 | 00000 |
M10 | 1.25 | 15 | 11.4 | 21.8 | 1.5 | DIN 6927 | 25 | 000000000 | 00000 |
M10 | 1.5 | 15 | 11.4 | 21.8 | 1.5 | DIN 6927 | 25 | 000000000 | 0000 |
M12 | 1.75 | 18 | 13.8 | 26 | 1.8 | DIN 6927 | 25 | 000000000 | 00000 |
M16 | 2 | 24 | 18.3 | 34.5 | 2.4 | DIN 6927 | 10 | 000000000 | 00000 |
Medium-Strength Steel Distorted-Thread Flange Locknuts—Grade 5
For a stronger hold than nylon-insert flange locknuts, these locknuts grip the bolt with an irregularly shaped thread. The flange distributes pressure where the nut meets the material surface, so you don’t need a separate washer. Made from Grade 5 steel, these locknuts are a good choice for fastening most machinery and equipment.
Black-phosphate steel locknuts resist corrosion in wet environments and have a black finish that blends in with dark surfaces.
Zinc-plated steel locknuts resist corrosion in wet environments.
For technical drawings and 3-D models, click on a part number.
Flange | |||||||
---|---|---|---|---|---|---|---|
Thread Size | Wd. | Ht. | Dia. | Thick. | Pkg. Qty. | Pkg. | |
Black-Phosphate Steel—Grade 5 | |||||||
1/4"-20 | 7/16" | 15/64" | 9/16" | 0.05" | 100 | 000000000 | 00000 |
5/16"-18 | 1/2" | 9/32" | 11/16" | 0.05" | 100 | 000000000 | 0000 |
3/8"-16 | 9/16" | 11/32" | 3/4" | 0.06" | 100 | 000000000 | 00000 |
7/16"-14 | 11/16" | 25/64" | 15/16" | 0.06" | 50 | 000000000 | 00000 |
7/16"-20 | 11/16" | 25/64" | 15/16" | 0.06" | 50 | 000000000 | 00000 |
1/2"-13 | 3/4" | 29/64" | 1 1/32" | 0.08" | 50 | 000000000 | 00000 |
1/2"-20 | 3/4" | 29/64" | 1 1/32" | 0.08" | 50 | 000000000 | 00000 |
5/8"-11 | 15/16" | 9/16" | 1 9/32" | 0.09" | 10 | 000000000 | 0000 |
3/4"-10 | 1 1/8" | 43/64" | 1 37/64" | 0.11" | 10 | 000000000 | 0000 |
1"-8 | 1 1/2" | 29/32" | 2 1/16" | 0.13" | 1 | 000000000 | 0000 |
Zinc-Plated Steel—Grade 5 | |||||||
1/4"-20 | 7/16" | 15/64" | 9/16" | 0.05" | 100 | 000000000 | 0000 |
5/16"-18 | 1/2" | 9/32" | 11/16" | 0.05" | 100 | 000000000 | 0000 |
5/16"-24 | 1/2" | 9/32" | 11/16" | 0.05" | 100 | 000000000 | 0000 |
3/8"-16 | 9/16" | 11/32" | 3/4" | 0.06" | 100 | 000000000 | 00000 |
7/16"-14 | 11/16" | 25/64" | 15/16" | 0.06" | 50 | 000000000 | 00000 |
7/16"-20 | 11/16" | 25/64" | 15/16" | 0.06" | 50 | 000000000 | 00000 |
1/2"-13 | 3/4" | 29/64" | 1 1/32" | 0.08" | 50 | 000000000 | 00000 |
1/2"-20 | 3/4" | 29/64" | 1 1/32" | 0.08" | 50 | 000000000 | 00000 |
5/8"-11 | 15/16" | 9/16" | 1 9/32" | 0.09" | 10 | 000000000 | 0000 |
3/4"-10 | 1 1/8" | 43/64" | 1 37/64" | 0.11" | 10 | 000000000 | 0000 |
7/8"-9 | 1 5/16" | 25/32" | 1 3/4" | 0.13" | 5 | 000000000 | 00000 |
1"-8 | 1 1/2" | 29/32" | 2 1/16" | 0.13" | 1 | 000000000 | 0000 |
1"-14 | 1 1/2" | 29/32" | 2 1/16" | 0.13" | 1 | 000000000 | 0000 |
Stainless Steel Distorted-Thread Flange Locknuts
These flange locknuts have excellent resistance to chemicals and salt water. They have an irregularly shaped thread that grips the bolt for a stronger hold than nylon-insert flange locknuts. A flange distributes pressure where the nut meets the material surface, eliminating the need for a separate washer. These nuts may be mildly magnetic. Height includes the flange.
A286 stainless steel nuts cannot be reused. Those with lubricant thread onto bolts smoothly.
18-8 stainless steel nuts can be used multiple times.
Nuts with serrations grip the material surface for mild vibration resistance.
For technical drawings and 3-D models, click on a part number.
Flange | |||||||||
---|---|---|---|---|---|---|---|---|---|
Thread Size | Wd. | Ht. | Dia. | Thick. | Specifications Met | Locking Type | Pkg. Qty. | Pkg. | |
Silver-Plated A286 Stainless Steel | |||||||||
4-40 | 5/32" | 1/8" | 0.206" | 0.03" | MS21043-04 | Distorted Thread | 5 | 000000000 | 000000 |
6-32 | 3/16" | 9/64" | 0.244" | 0.03" | MS21043-06 | Distorted Thread | 5 | 000000000 | 0000 |
8-32 | 7/32" | 3/16" | 0.29" | 0.03" | MS21043-08 | Distorted Thread | 5 | 000000000 | 00000 |
10-32 | 1/4" | 3/16" | 0.33" | 0.03" | MS21043-3 | Distorted Thread | 5 | 000000000 | 0000 |
1/4"-28 | 5/16" | 7/32" | 0.42" | 0.04" | MS21043-4 | Distorted Thread | 5 | 000000000 | 00000 |
5/16"-24 | 3/8" | 17/64" | 0.52" | 0.04" | MS21043-5 | Distorted Thread | 1 | 000000000 | 0000 |
3/8"-24 | 7/16" | 9/32" | 0.62" | 0.04" | MS21043-6 | Distorted Thread | 1 | 000000000 | 0000 |
A286 Stainless Steel with Lubricant | |||||||||
2-56 | 1/8" | 3/32" | 0.167" | 0.01" | NAS1291C02M | Distorted Thread | 5 | 000000000 | 00000 |
4-40 | 5/32" | 1/8" | 0.206" | 0.01" | NAS1291C04M | Distorted Thread | 1 | 000000000 | 0000 |
6-32 | 3/16" | 9/64" | 0.244" | 0.01" | NAS1291C06M | Distorted Thread | 1 | 000000000 | 0000 |
8-32 | 7/32" | 3/16" | 0.29" | 0.02" | NAS1291C08M | Distorted Thread | 1 | 000000000 | 0000 |
10-32 | 1/4" | 3/16" | 0.33" | 0.02" | NAS1291C3M | Distorted Thread | 1 | 000000000 | 0000 |
1/4"-28 | 5/16" | 7/32" | 0.42" | 0.02" | NAS1291C4M | Distorted Thread | 1 | 000000000 | 0000 |
5/16"-24 | 3/8" | 17/64" | 0.52" | 0.03" | NAS1291C5M | Distorted Thread | 1 | 000000000 | 0000 |
3/8"-24 | 7/16" | 9/32" | 0.62" | 0.03" | NAS1291C6M | Distorted Thread | 1 | 000000000 | 00000 |
7/16"-20 | 1/2" | 21/64" | 0.708" | 0.04" | NAS1291C7M | Distorted Thread | 1 | 000000000 | 00000 |
1/2"-20 | 9/16" | 13/32" | 0.814" | 0.04" | NAS1291C8M | Distorted Thread | 1 | 000000000 | 00000 |
18-8 Stainless Steel | |||||||||
6-32 | 5/16" | 11/64" | 0.422" | 0.02" | __ | Distorted Thread | 5 | 000000000 | 0000 |
8-32 | 11/32" | 13/64" | 0.469" | 0.02" | __ | Distorted Thread | 5 | 000000000 | 0000 |
10-24 | 3/8" | 7/32" | 0.5" | 0.03" | __ | Distorted Thread | 5 | 000000000 | 0000 |
10-32 | 3/8" | 7/32" | 0.5" | 0.03" | __ | Distorted Thread | 5 | 000000000 | 0000 |
12-24 | 7/16" | 15/64" | 0.594" | 0.04" | __ | Distorted Thread | 5 | 000000000 | 00000 |
1/4"-20 | 7/16" | 15/64" | 0.594" | 0.04" | __ | Distorted Thread, Serrations | 10 | 000000000 | 0000 |
1/4"-28 | 7/16" | 15/64" | 0.594" | 0.04" | __ | Distorted Thread | 1 | 000000000 | 0000 |
5/16"-18 | 1/2" | 9/32" | 0.68" | 0.04" | __ | Distorted Thread, Serrations | 10 | 000000000 | 0000 |
3/8"-16 | 9/16" | 11/32" | 0.75" | 0.04" | __ | Distorted Thread, Serrations | 10 | 000000000 | 0000 |
3/8"-24 | 9/16" | 11/32" | 0.75" | 0.04" | __ | Distorted Thread | 1 | 000000000 | 0000 |
1/2"-13 | 3/4" | 29/64" | 1.031" | 0.04" | __ | Distorted Thread, Serrations | 5 | 000000000 | 0000 |
1/2"-20 | 3/4" | 29/64" | 1.031" | 0.05" | __ | Distorted Thread | 1 | 000000000 | 0000 |