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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. Fine threads are closely spaced to prevent loosening from vibration. They are not compatible with coarse threads.
Head | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | Threading | Min. Thread Lg. | Thread Spacing  | Dia. | Ht. | Drive Size | Tensile Strength, psi | Specifications Met | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | |||||||||||
0-80 | |||||||||||
| 1/8" | Fully Threaded | __ | Fine | 0.096" | 0.06" | 0.050" | 80,000 | MS16996-1, NAS1351C00-2, NASM16996, Fed. Spec. FF-S-86 | 10 | 000000000 | 00000 |
| 3/16" | Fully Threaded | __ | Fine | 0.096" | 0.06" | 0.050" | 80,000 | MS16996-2, NAS1351C00-3, NASM16996, Fed. Spec. FF-S-86 | 10 | 000000000 | 0000 |
| 1/4" | Fully Threaded | __ | Fine | 0.096" | 0.06" | 0.050" | 80,000 | MS16996-3, NAS1351C00-4, NASM16996, Fed. Spec. FF-S-86 | 10 | 000000000 | 0000 |
| 3/8" | Fully Threaded | __ | Fine | 0.096" | 0.06" | 0.050" | 80,000 | MS16996-4, NAS1351C00-6, NASM16996, Fed. Spec. FF-S-86 | 10 | 000000000 | 0000 |
10-32 | |||||||||||
| 3/8" | Fully Threaded | __ | Fine | 5/16" | 0.19" | 5/32" | 80,000 | MS16996-9, NAS1351C3-6, NASM16996, Fed. Spec. FF-S-86 | 10 | 000000000 | 0000 |
| 1/2" | Fully Threaded | __ | Fine | 5/16" | 0.19" | 5/32" | 80,000 | MS16996-10, NAS1351C3-8, NASM16996, Fed. Spec. FF-S-86 | 10 | 000000000 | 0000 |
| 5/8" | Fully Threaded | __ | Fine | 5/16" | 0.19" | 5/32" | 80,000 | MS16996-11, NAS1351C3-10, NASM16996, Fed. Spec. FF-S-86 | 10 | 000000000 | 0000 |
| 3/4" | Fully Threaded | __ | Fine | 5/16" | 0.19" | 5/32" | 80,000 | MS16996-12, NAS1351C3-12, NASM16996, Fed. Spec. FF-S-86 | 10 | 000000000 | 0000 |
| 7/8" | Fully Threaded | __ | Fine | 5/16" | 0.19" | 5/32" | 80,000 | MS16996-13, NAS1351C3-14, NASM16996, Fed. Spec. FF-S-86 | 10 | 000000000 | 0000 |
| 1" | Fully Threaded | __ | Fine | 5/16" | 0.19" | 5/32" | 80,000 | MS16996-14, NAS1351C3-16, NASM16996, Fed. Spec. FF-S-86 | 10 | 000000000 | 0000 |
| 1 1/4" | Partially Threaded | 7/8" | Fine | 5/16" | 0.19" | 5/32" | 80,000 | MS16996-15, NAS1351C3-20, NASM16996, Fed. Spec. FF-S-86 | 10 | 000000000 | 0000 |
| 1 1/2" | Partially Threaded | 1 1/8" | Fine | 5/16" | 0.19" | 5/32" | 80,000 | MS16996-16, NAS1351C3-24, NASM16996, Fed. Spec. FF-S-86 | 10 | 000000000 | 0000 |
1/4"-28 | |||||||||||
| 1/2" | Fully Threaded | __ | Fine | 3/8" | 1/4" | 3/16" | 80,000 | MS16996-21, NAS1351C4-8, NASM16996, Fed. Spec. FF-S-86 | 5 | 000000000 | 0000 |
| 5/8" | Fully Threaded | __ | Fine | 3/8" | 1/4" | 3/16" | 80,000 | MS16996-22, NAS1351C4-10, NASM16996, Fed. Spec. FF-S-86 | 5 | 000000000 | 0000 |
| 3/4" | Fully Threaded | __ | Fine | 3/8" | 1/4" | 3/16" | 80,000 | MS16996-23, NAS1351C4-12, NASM16996, Fed. Spec. FF-S-86 | 5 | 000000000 | 0000 |
| 1" | Fully Threaded | __ | Fine | 3/8" | 1/4" | 3/16" | 80,000 | MS16996-24, NAS1351C4-16, NASM16996, Fed. Spec. FF-S-86 | 5 | 000000000 | 00000 |
| 1 1/4" | Fully Threaded | __ | Fine | 3/8" | 1/4" | 3/16" | 80,000 | MS16996-25, NAS1351C4-20, NASM16996, Fed. Spec. FF-S-86 | 5 | 000000000 | 00000 |
| 1 1/2" | Partially Threaded | 1" | Fine | 3/8" | 1/4" | 3/16" | 80,000 | MS16996-26, NAS1351C4-24, NASM16996, Fed. Spec. FF-S-86 | 5 | 000000000 | 00000 |
5/16"-24 | |||||||||||
| 3/4" | Fully Threaded | __ | Fine | 15/32" | 5/16" | 1/4" | 80,000 | MS16996-31, NAS1351C5-12, NASM16996, Fed. Spec. FF-S-86 | 1 | 000000000 | 0000 |
| 1" | Fully Threaded | __ | Fine | 15/32" | 5/16" | 1/4" | 80,000 | MS16996-32, NAS1351C5-16, NASM16996, Fed. Spec. FF-S-86 | 1 | 000000000 | 0000 |
| 1 1/4" | Fully Threaded | __ | Fine | 15/32" | 5/16" | 1/4" | 80,000 | MS16996-33, NAS1351C5-20, NASM16996, Fed. Spec. FF-S-86 | 1 | 000000000 | 0000 |
| 1 1/2" | Fully Threaded | __ | Fine | 15/32" | 5/16" | 1/4" | 80,000 | MS16996-34, NAS1351C5-24, NASM16996, Fed. Spec. FF-S-86 | 1 | 000000000 | 0000 |
3/8"-24 | |||||||||||
| 3/4" | Fully Threaded | __ | Fine | 9/16" | 3/8" | 5/16" | 80,000 | MS16996-39, NAS1351C6-12, NASM16996, Fed. Spec. FF-S-86 | 1 | 000000000 | 0000 |
| 1" | Fully Threaded | __ | Fine | 9/16" | 3/8" | 5/16" | 80,000 | MS16996-40, NAS1351C6-16, NASM16996, Fed. Spec. FF-S-86 | 1 | 000000000 | 0000 |
| 1 1/4" | Fully Threaded | __ | Fine | 9/16" | 3/8" | 5/16" | 80,000 | MS16996-41, NAS1351C6-20, NASM16996, Fed. Spec. FF-S-86 | 1 | 000000000 | 00000 |
| 1 1/2" | Fully Threaded | __ | Fine | 9/16" | 3/8" | 5/16" | 80,000 | MS16996-42, NAS1351C6-24, NASM16996, Fed. Spec. FF-S-86 | 1 | 000000000 | 0000 |