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About Socket Head Screws
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Mil. Spec. 18-8 Stainless Steel Socket Head Screws
Fully Threaded
Partially Threaded
Choose these screws for their adherence to strict military standards for material and construction. Dimensions meet Fed. Spec. FF-S-86 specifications. Screws may be mildly magnetic. Length is measured from under the head.
Coarse threads are the industry standard; choose these screws if you don’t know the threads per inch.
For technical drawings and 3-D models, click on a part number.
Head | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | Threading | Min. Thread Lg. | Thread Spacing  | Dia. | Ht. | Drive Size | Tensile Strength, psi | Specifications Met | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | |||||||||||
2-56 | |||||||||||
| 3/16" | Fully Threaded | __ | Coarse | 9/64" | 0.086" | 5/64" | 80,000 | MS16995-1, NAS1352C02-3, NASM16995, Fed. Spec. FF-S-86 | 10 | 000000000 | 00000 |
| 1/4" | Fully Threaded | __ | Coarse | 9/64" | 0.086" | 5/64" | 80,000 | MS16995-2, NAS1352C02-4, NASM16995, Fed. Spec. FF-S-86 | 10 | 000000000 | 0000 |
| 5/16" | Fully Threaded | __ | Coarse | 9/64" | 0.086" | 5/64" | 80,000 | NAS1352C02-5, Fed. Spec. FF-S-86 | 10 | 000000000 | 0000 |
| 3/8" | Fully Threaded | __ | Coarse | 9/64" | 0.086" | 5/64" | 80,000 | MS16995-3, NAS1352C02-6, NASM16995, Fed. Spec. FF-S-86 | 10 | 000000000 | 0000 |
| 1/2" | Fully Threaded | __ | Coarse | 9/64" | 0.086" | 5/64" | 80,000 | MS16995-4, NAS1352C02-8, NASM16995, Fed. Spec. FF-S-86 | 10 | 000000000 | 0000 |
4-40 | |||||||||||
| 3/16" | Fully Threaded | __ | Coarse | 0.183" | 0.112" | 3/32" | 80,000 | NAS1352C04-3, Fed. Spec. FF-S-86 | 10 | 000000000 | 0000 |
| 1/4" | Fully Threaded | __ | Coarse | 0.183" | 0.112" | 3/32" | 80,000 | MS16995-9, NAS1352C04-4, NASM16995, Fed. Spec. FF-S-86 | 10 | 000000000 | 0000 |
| 5/16" | Fully Threaded | __ | Coarse | 0.183" | 0.112" | 3/32" | 80,000 | NAS1352C04-5, Fed. Spec. FF-S-86 | 10 | 000000000 | 0000 |
| 3/8" | Fully Threaded | __ | Coarse | 0.183" | 0.112" | 3/32" | 80,000 | MS16995-10, NAS1352C04-6, NASM16995, Fed. Spec. FF-S-86 | 10 | 000000000 | 0000 |
| 7/16" | Fully Threaded | __ | Coarse | 0.183" | 0.112" | 3/32" | 80,000 | NAS1352C04-7, Fed. Spec. FF-S-86 | 10 | 000000000 | 0000 |
| 1/2" | Fully Threaded | __ | Coarse | 0.183" | 0.112" | 3/32" | 80,000 | MS16995-11, NAS1352C04-8, NASM16995, Fed. Spec. FF-S-86 | 10 | 000000000 | 0000 |
| 5/8" | Fully Threaded | __ | Coarse | 0.183" | 0.112" | 3/32" | 80,000 | MS16995-12, NAS1352C04-10, NASM16995, Fed. Spec. FF-S-86 | 10 | 000000000 | 0000 |
| 3/4" | Fully Threaded | __ | Coarse | 0.183" | 0.112" | 3/32" | 80,000 | MS16995-13, NAS1352C04-12, NASM16995, Fed. Spec. FF-S-86 | 10 | 000000000 | 0000 |
6-32 | |||||||||||
| 1/4" | Fully Threaded | __ | Coarse | 0.226" | 0.138" | 7/64" | 80,000 | MS16995-16, NAS1352C06-4, NASM16995, Fed. Spec. FF-S-86 | 10 | 000000000 | 0000 |
| 5/16" | Fully Threaded | __ | Coarse | 0.226" | 0.138" | 7/64" | 80,000 | NAS1352C06-5, Fed. Spec. FF-S-86 | 10 | 000000000 | 0000 |
| 3/8" | Fully Threaded | __ | Coarse | 0.226" | 0.138" | 7/64" | 80,000 | MS16995-17, NAS1352C06-6, NASM16995, Fed. Spec. FF-S-86 | 10 | 000000000 | 0000 |
| 7/16" | Fully Threaded | __ | Coarse | 0.226" | 0.138" | 7/64" | 80,000 | NAS1352C06-7, Fed. Spec. FF-S-86 | 10 | 000000000 | 0000 |
| 1/2" | Fully Threaded | __ | Coarse | 0.226" | 0.138" | 7/64" | 80,000 | MS16995-18, NAS1352C06-8, NASM16995, Fed. Spec. FF-S-86 | 10 | 000000000 | 0000 |
| 5/8" | Fully Threaded | __ | Coarse | 0.226" | 0.138" | 7/64" | 80,000 | MS16995-19, NAS1352C06-10, NASM16995, Fed. Spec. FF-S-86 | 10 | 000000000 | 0000 |
| 3/4" | Fully Threaded | __ | Coarse | 0.226" | 0.138" | 7/64" | 80,000 | MS16995-20, NAS1352C06-12, NASM16995, Fed. Spec. FF-S-86 | 10 | 000000000 | 0000 |
| 1" | Fully Threaded | __ | Coarse | 0.226" | 0.138" | 7/64" | 80,000 | MS16995-21, NAS1352C06-16, NASM16995, Fed. Spec. FF-S-86 | 10 | 000000000 | 0000 |
8-32 | |||||||||||
| 1/4" | Fully Threaded | __ | Coarse | 0.27" | 0.164" | 9/64" | 80,000 | NAS1352C08-4, Fed. Spec. FF-S-86 | 10 | 000000000 | 0000 |
| 3/8" | Fully Threaded | __ | Coarse | 0.27" | 0.164" | 9/64" | 80,000 | MS16995-25, NAS1352C08-6, NASM16995, Fed. Spec. FF-S-86 | 10 | 000000000 | 0000 |
| 1/2" | Fully Threaded | __ | Coarse | 0.27" | 0.164" | 9/64" | 80,000 | MS16995-26, NAS1352C08-8, NASM16995, Fed. Spec. FF-S-86 | 10 | 000000000 | 0000 |
| 5/8" | Fully Threaded | __ | Coarse | 0.27" | 0.164" | 9/64" | 80,000 | MS16995-27, NAS1352C08-10, NASM16995, Fed. Spec. FF-S-86 | 10 | 000000000 | 0000 |
| 3/4" | Fully Threaded | __ | Coarse | 0.27" | 0.164" | 9/64" | 80,000 | MS16995-28, NAS1352C08-12, NASM16995, Fed. Spec. FF-S-86 | 10 | 000000000 | 0000 |
| 7/8" | Fully Threaded | __ | Coarse | 0.27" | 0.164" | 9/64" | 80,000 | MS16995-29, NAS1352C08-14, NASM16995, Fed. Spec. FF-S-86 | 10 | 000000000 | 0000 |
| 1" | Fully Threaded | __ | Coarse | 0.27" | 0.164" | 9/64" | 80,000 | MS16995-30, NAS1352C08-16, NASM16995, Fed. Spec. FF-S-86 | 10 | 000000000 | 0000 |
10-24 | |||||||||||
| 3/8" | Fully Threaded | __ | Coarse | 5/16" | 0.19" | 5/32" | 80,000 | MS16995-35, NAS1352C3-6, NASM16995, Fed. Spec. FF-S-86 | 10 | 000000000 | 0000 |
| 1/2" | Fully Threaded | __ | Coarse | 5/16" | 0.19" | 5/32" | 80,000 | MS16995-36, NAS1352C3-8, NASM16995, Fed. Spec. FF-S-86 | 10 | 000000000 | 0000 |
| 5/8" | Fully Threaded | __ | Coarse | 5/16" | 0.19" | 5/32" | 80,000 | MS16995-37, NAS1352C3-10, NASM16995, Fed. Spec. FF-S-86 | 10 | 000000000 | 0000 |
| 3/4" | Fully Threaded | __ | Coarse | 5/16" | 0.19" | 5/32" | 80,000 | MS16995-38, NAS1352C3-12, NASM16995, Fed. Spec. FF-S-86 | 10 | 000000000 | 0000 |
| 7/8" | Fully Threaded | __ | Coarse | 5/16" | 0.19" | 5/32" | 80,000 | MS16995-39, NAS1352C3-14, NASM16995, Fed. Spec. FF-S-86 | 10 | 000000000 | 0000 |
| 1" | Fully Threaded | __ | Coarse | 5/16" | 0.19" | 5/32" | 80,000 | MS16995-40, NAS1352C3-16, NASM16995, Fed. Spec. FF-S-86 | 10 | 000000000 | 0000 |
| 1 1/4" | Partially Threaded | 7/8" | Coarse | 5/16" | 0.19" | 5/32" | 80,000 | MS16995-41, NAS1352C3-20, NASM16995, Fed. Spec. FF-S-86 | 10 | 000000000 | 0000 |
| 1 1/2" | Partially Threaded | 1 1/8" | Coarse | 5/16" | 0.19" | 5/32" | 80,000 | MS16995-42, NAS1352C3-24, NASM16995, Fed. Spec. FF-S-86 | 10 | 000000000 | 0000 |
1/4"-20 | |||||||||||
| 3/8" | Fully Threaded | __ | Coarse | 3/8" | 1/4" | 3/16" | 80,000 | MS16995-47, NAS1352C4-6, NASM16995, Fed. Spec. FF-S-86 | 5 | 000000000 | 0000 |
| 1/2" | Fully Threaded | __ | Coarse | 3/8" | 1/4" | 3/16" | 80,000 | MS16995-48, NAS1352C4-8, NASM16995, Fed. Spec. FF-S-86 | 5 | 000000000 | 0000 |
| 5/8" | Fully Threaded | __ | Coarse | 3/8" | 1/4" | 3/16" | 80,000 | MS16995-49, NAS1352C4-10, NASM16995, Fed. Spec. FF-S-86 | 5 | 000000000 | 0000 |
| 3/4" | Fully Threaded | __ | Coarse | 3/8" | 1/4" | 3/16" | 80,000 | MS16995-50, NAS1352C4-12, NASM16995, Fed. Spec. FF-S-86 | 5 | 000000000 | 0000 |
| 7/8" | Fully Threaded | __ | Coarse | 3/8" | 1/4" | 3/16" | 80,000 | MS16995-51, NAS1352C4-14, NASM16995, Fed. Spec. FF-S-86 | 5 | 000000000 | 0000 |
| 1" | Fully Threaded | __ | Coarse | 3/8" | 1/4" | 3/16" | 80,000 | MS16995-52, NAS1352C4-16, NASM16995, Fed. Spec. FF-S-86 | 5 | 000000000 | 00000 |
| 1 1/4" | Fully Threaded | __ | Coarse | 3/8" | 1/4" | 3/16" | 80,000 | MS16995-53, NAS1352C4-20, NASM16995, Fed. Spec. FF-S-86 | 5 | 000000000 | 0000 |
| 1 1/2" | Partially Threaded | 1" | Coarse | 3/8" | 1/4" | 3/16" | 80,000 | MS16995-54, NAS1352C4-24, NASM16995, Fed. Spec. FF-S-86 | 5 | 000000000 | 00000 |
| 1 3/4" | Partially Threaded | 1 1/4" | Coarse | 3/8" | 1/4" | 3/16" | 80,000 | MS16995-55, NAS1352C4-28, NASM16995, Fed. Spec. FF-S-86 | 5 | 000000000 | 00000 |
| 2" | Partially Threaded | 1" | Coarse | 3/8" | 1/4" | 3/16" | 80,000 | MS16995-56, NAS1352C4-32, NASM16995, Fed. Spec. FF-S-86 | 5 | 000000000 | 00000 |
5/16"-18 | |||||||||||
| 3/8" | Fully Threaded | __ | Coarse | 15/32" | 5/16" | 1/4" | 80,000 | MS16995-61, NAS1352C5-6, NASM16995, Fed. Spec. FF-S-86 | 1 | 000000000 | 0000 |
| 1/2" | Fully Threaded | __ | Coarse | 15/32" | 5/16" | 1/4" | 80,000 | MS16995-62, NAS1352C5-8, NASM16995, Fed. Spec. FF-S-86 | 1 | 000000000 | 0000 |
| 5/8" | Fully Threaded | __ | Coarse | 15/32" | 5/16" | 1/4" | 80,000 | MS16995-63, NAS1352C5-10, NASM16995, Fed. Spec. FF-S-86 | 1 | 000000000 | 0000 |
| 3/4" | Fully Threaded | __ | Coarse | 15/32" | 5/16" | 1/4" | 80,000 | MS16995-64, NAS1352C5-12, NASM16995, Fed. Spec. FF-S-86 | 1 | 000000000 | 0000 |
| 7/8" | Fully Threaded | __ | Coarse | 15/32" | 5/16" | 1/4" | 80,000 | MS16995-65, NAS1352C5-14, NASM16995, Fed. Spec. FF-S-86 | 1 | 000000000 | 0000 |
| 1" | Fully Threaded | __ | Coarse | 15/32" | 5/16" | 1/4" | 80,000 | MS16995-66, NAS1352C5-16, NASM16995, Fed. Spec. FF-S-86 | 1 | 000000000 | 0000 |
| 1 1/4" | Fully Threaded | __ | Coarse | 15/32" | 5/16" | 1/4" | 80,000 | MS16995-67, NAS1352C5-20, NASM16995, Fed. Spec. FF-S-86 | 1 | 000000000 | 0000 |
| 1 1/2" | Fully Threaded | __ | Coarse | 15/32" | 5/16" | 1/4" | 80,000 | MS16995-68, NAS1352C5-24, NASM16995, Fed. Spec. FF-S-86 | 1 | 000000000 | 0000 |
| 1 3/4" | Partially Threaded | 1 1/8" | Coarse | 15/32" | 5/16" | 1/4" | 80,000 | MS16995-69, NAS1352C5-28, NASM16995, Fed. Spec. FF-S-86 | 1 | 000000000 | 0000 |
| 2" | Partially Threaded | 1 3/8" | Coarse | 15/32" | 5/16" | 1/4" | 80,000 | MS16995-70, NAS1352C5-32, NASM16995, Fed. Spec. FF-S-86 | 1 | 000000000 | 00000 |
| 2 1/4" | Partially Threaded | 1 1/8" | Coarse | 15/32" | 5/16" | 1/4" | 80,000 | MS16995-71, NAS1352C5-36, NASM16995, Fed. Spec. FF-S-86 | 1 | 000000000 | 00000 |
| 2 1/2" | Partially Threaded | 1 3/8" | Coarse | 15/32" | 5/16" | 1/4" | 80,000 | MS16995-72, NAS1352C5-40, NASM16995, Fed. Spec. FF-S-86 | 1 | 000000000 | 00000 |
3/8"-16 | |||||||||||
| 1/2" | Fully Threaded | __ | Coarse | 9/16" | 3/8" | 5/16" | 80,000 | MS16995-77, NAS1352C6-8, NASM16995, Fed. Spec. FF-S-86 | 1 | 000000000 | 0000 |
| 5/8" | Fully Threaded | __ | Coarse | 9/16" | 3/8" | 5/16" | 80,000 | MS16995-78, NAS1352C6-10, NASM16995, Fed. Spec. FF-S-86 | 1 | 000000000 | 0000 |
| 3/4" | Fully Threaded | __ | Coarse | 9/16" | 3/8" | 5/16" | 80,000 | MS16995-79, NAS1352C6-12, NASM16995, Fed. Spec. FF-S-86 | 1 | 000000000 | 0000 |
| 7/8" | Fully Threaded | __ | Coarse | 9/16" | 3/8" | 5/16" | 80,000 | MS16995-80, NAS1352C6-14, NASM16995, Fed. Spec. FF-S-86 | 1 | 000000000 | 0000 |
| 1" | Fully Threaded | __ | Coarse | 9/16" | 3/8" | 5/16" | 80,000 | MS16995-81, NAS1352C6-16, NASM16995, Fed. Spec. FF-S-86 | 1 | 000000000 | 0000 |
| 1 1/4" | Fully Threaded | __ | Coarse | 9/16" | 3/8" | 5/16" | 80,000 | MS16995-82, NAS1352C6-20, NASM16995, Fed. Spec. FF-S-86 | 1 | 000000000 | 0000 |
| 1 1/2" | Fully Threaded | __ | Coarse | 9/16" | 3/8" | 5/16" | 80,000 | MS16995-83, NAS1352C6-24, NASM16995, Fed. Spec. FF-S-86 | 1 | 000000000 | 00000 |
| 1 3/4" | Partially Threaded | 1 1/4" | Coarse | 9/16" | 3/8" | 5/16" | 80,000 | MS16995-84, NAS1352C6-28, NASM16995, Fed. Spec. FF-S-86 | 1 | 000000000 | 00000 |
| 2" | Partially Threaded | 1 1/2" | Coarse | 9/16" | 3/8" | 5/16" | 80,000 | MS16995-85, NAS1352C6-32, NASM16995, Fed. Spec. FF-S-86 | 1 | 000000000 | 00000 |
| 2 1/4" | Partially Threaded | 1 1/4" | Coarse | 9/16" | 3/8" | 5/16" | 80,000 | MS16995-86, NAS1352C6-36, NASM16995, Fed. Spec. FF-S-86 | 1 | 000000000 | 00000 |
| 2 1/2" | Partially Threaded | 1 1/2" | Coarse | 9/16" | 3/8" | 5/16" | 80,000 | MS16995-87, NAS1352C6-40, NASM16995, Fed. Spec. FF-S-86 | 1 | 000000000 | 00000 |
1/2"-13 | |||||||||||
| 3/4" | Fully Threaded | __ | Coarse | 3/4" | 1/2" | 3/8" | 80,000 | MS16995-92, NAS1352C8-12, NASM16995, Fed. Spec. FF-S-86 | 1 | 000000000 | 00000 |
| 1" | Fully Threaded | __ | Coarse | 3/4" | 1/2" | 3/8" | 80,000 | MS16995-94, NAS1352C8-16, NASM16995, Fed. Spec. FF-S-86 | 1 | 000000000 | 00000 |
| 1 1/4" | Fully Threaded | __ | Coarse | 3/4" | 1/2" | 3/8" | 80,000 | MS16995-95, NAS1352C8-20, NASM16995, Fed. Spec. FF-S-86 | 1 | 000000000 | 00000 |
| 1 1/2" | Fully Threaded | __ | Coarse | 3/4" | 1/2" | 3/8" | 80,000 | MS16995-96, NAS1352C8-24, NASM16995, Fed. Spec. FF-S-86 | 1 | 000000000 | 00000 |
| 2" | Fully Threaded | __ | Coarse | 3/4" | 1/2" | 3/8" | 80,000 | MS16995-98, NAS1352C8-32, NASM16995, Fed. Spec. FF-S-86 | 1 | 000000000 | 00000 |
| 2 1/2" | Partially Threaded | 1 3/4" | Coarse | 3/4" | 1/2" | 3/8" | 80,000 | MS16995-100, NAS1352C8-40, NASM16995, Fed. Spec. FF-S-86 | 1 | 000000000 | 00000 |
| 3" | Partially Threaded | 1 1/2" | Coarse | 3/4" | 1/2" | 3/8" | 80,000 | MS16995-102, NAS1352C8-48, NASM16995, Fed. Spec. FF-S-86 | 1 | 000000000 | 00000 |