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About Socket Head Screws
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Mil. Spec. Alloy Steel Socket Head Screws
Fully Threaded
Partially Threaded
Choose these screws for their adherence to strict military standards for material and construction. With a tensile strength of 160,000 psi, these alloy steel screws are stronger than Grade 8 steel screws. They're cadmium plated to resist corrosion in wet environments. 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.
Head | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | Threading | Min. Thread Lg. | Thread Spacing  | Dia. | Ht. | Drive Size | Tensile Strength, psi | Specifications Met | Each | |
Cadmium-Plated Alloy Steel | ||||||||||
2-56 | ||||||||||
| 3/16" | Fully Threaded | __ | Coarse | 9/64" | 0.086" | 5/64" | 160,000 | MS16997-1, NAS1352-02-3P | 000000000 | 00000 |
| 1/4" | Fully Threaded | __ | Coarse | 9/64" | 0.086" | 5/64" | 160,000 | MS16997-2, NAS1352-02-4P | 000000000 | 0000 |
| 3/8" | Fully Threaded | __ | Coarse | 9/64" | 0.086" | 5/64" | 160,000 | MS16997-3, NAS1352-02-6P | 000000000 | 0000 |
| 1/2" | Fully Threaded | __ | Coarse | 9/64" | 0.086" | 5/64" | 160,000 | MS16997-4, NAS1352-02-8P | 000000000 | 0000 |
4-40 | ||||||||||
| 1/4" | Fully Threaded | __ | Coarse | 0.183" | 0.112" | 3/32" | 160,000 | MS16997-9, NAS1352-04-4P | 000000000 | 0000 |
| 3/8" | Fully Threaded | __ | Coarse | 0.183" | 0.112" | 3/32" | 160,000 | MS16997-10, NAS1352-04-6P | 000000000 | 0000 |
| 1/2" | Fully Threaded | __ | Coarse | 0.183" | 0.112" | 3/32" | 160,000 | MS16997-11, NAS1352-04-8P | 000000000 | 0000 |
| 5/8" | Fully Threaded | __ | Coarse | 0.183" | 0.112" | 3/32" | 160,000 | MS16997-12, NAS1352-04-10P | 000000000 | 0000 |
| 3/4" | Fully Threaded | __ | Coarse | 0.183" | 0.112" | 3/32" | 160,000 | MS16997-13, NAS1352-04-12P | 000000000 | 0000 |
| 1" | Partially Threaded | 3/4" | Coarse | 0.183" | 0.112" | 3/32" | 160,000 | MS16997-14, NAS1352-04-16P | 000000000 | 0000 |
6-32 | ||||||||||
| 1/4" | Fully Threaded | __ | Coarse | 0.226" | 0.138" | 7/64" | 160,000 | MS16997-18, NAS1352-06-4P | 000000000 | 0000 |
| 3/8" | Fully Threaded | __ | Coarse | 0.226" | 0.138" | 7/64" | 160,000 | MS16997-19, NAS1352-06-6P | 000000000 | 0000 |
| 1/2" | Fully Threaded | __ | Coarse | 0.226" | 0.138" | 7/64" | 160,000 | MS16997-20, NAS1352-06-8P | 000000000 | 0000 |
| 5/8" | Fully Threaded | __ | Coarse | 0.226" | 0.138" | 7/64" | 160,000 | MS16997-21, NAS1352-06-10P | 000000000 | 0000 |
| 3/4" | Fully Threaded | __ | Coarse | 0.226" | 0.138" | 7/64" | 160,000 | MS16997-22, NAS1352-06-12P | 000000000 | 0000 |
| 7/8" | Fully Threaded | __ | Coarse | 0.226" | 0.138" | 7/64" | 160,000 | MS16997-23, NAS1352-06-14P | 000000000 | 0000 |
| 1" | Fully Threaded | __ | Coarse | 0.226" | 0.138" | 7/64" | 160,000 | MS16997-24, NAS1352-06-16P | 000000000 | 0000 |
8-32 | ||||||||||
| 1/4" | Fully Threaded | __ | Coarse | 0.27" | 0.164" | 9/64" | 160,000 | MS16997-30, NAS1352-08-4P | 000000000 | 0000 |
| 3/8" | Fully Threaded | __ | Coarse | 0.27" | 0.164" | 9/64" | 160,000 | MS16997-31, NAS1352-08-6P | 000000000 | 0000 |
| 1/2" | Fully Threaded | __ | Coarse | 0.27" | 0.164" | 9/64" | 160,000 | MS16997-32, NAS1352-08-8P | 000000000 | 0000 |
| 5/8" | Fully Threaded | __ | Coarse | 0.27" | 0.164" | 9/64" | 160,000 | MS16997-33, NAS1352-08-10P | 000000000 | 0000 |
| 3/4" | Fully Threaded | __ | Coarse | 0.27" | 0.164" | 9/64" | 160,000 | MS16997-34, NAS1352-08-12P | 000000000 | 0000 |
| 7/8" | Fully Threaded | __ | Coarse | 0.27" | 0.164" | 9/64" | 160,000 | MS16997-35, NAS1352-08-14P | 000000000 | 0000 |
| 1" | Fully Threaded | __ | Coarse | 0.27" | 0.164" | 9/64" | 160,000 | MS16997-36, NAS1352-08-16P | 000000000 | 0000 |
| 1 1/4" | Partially Threaded | 7/8" | Coarse | 0.27" | 0.164" | 9/64" | 160,000 | MS16997-37, NAS1352-08-20P | 000000000 | 0000 |
| 1 1/2" | Partially Threaded | 1 1/8" | Coarse | 0.27" | 0.164" | 9/64" | 160,000 | MS16997-38, NAS1352-08-24P | 000000000 | 0000 |
10-24 | ||||||||||
| 3/8" | Fully Threaded | __ | Coarse | 5/16" | 0.19" | 5/32" | 160,000 | MS16997-43, NAS1352-3-6P | 000000000 | 0000 |
| 1/2" | Fully Threaded | __ | Coarse | 5/16" | 0.19" | 5/32" | 160,000 | MS16997-44, NAS1352-3-8P | 000000000 | 0000 |
| 5/8" | Fully Threaded | __ | Coarse | 5/16" | 0.19" | 5/32" | 160,000 | MS16997-45, NAS1352-3-10P | 000000000 | 0000 |
| 3/4" | Fully Threaded | __ | Coarse | 5/16" | 0.19" | 5/32" | 160,000 | MS16997-46, NAS1352-3-12P | 000000000 | 0000 |
| 7/8" | Fully Threaded | __ | Coarse | 5/16" | 0.19" | 5/32" | 160,000 | MS16997-47, NAS1352-3-14P | 000000000 | 0000 |
| 1" | Fully Threaded | __ | Coarse | 5/16" | 0.19" | 5/32" | 160,000 | MS16997-48, NAS1352-3-16P | 000000000 | 0000 |
| 1 1/4" | Partially Threaded | 7/8" | Coarse | 5/16" | 0.19" | 5/32" | 160,000 | MS16997-49, NAS1352-3-20P | 000000000 | 0000 |
| 1 1/2" | Partially Threaded | 1 1/8" | Coarse | 5/16" | 0.19" | 5/32" | 160,000 | MS16997-50, NAS1352-3-24P | 000000000 | 00000 |
| 1 3/4" | Partially Threaded | 7/8" | Coarse | 5/16" | 0.19" | 5/32" | 160,000 | MS16997-51, NAS1352-3-28P | 000000000 | 0000 |
| 2" | Partially Threaded | 1 1/8" | Coarse | 5/16" | 0.19" | 5/32" | 160,000 | MS16997-52, NAS1352-3-32P | 000000000 | 00000 |
1/4"-20 | ||||||||||
| 3/8" | Fully Threaded | __ | Coarse | 3/8" | 1/4" | 3/16" | 160,000 | MS16997-57, NAS1352-4-6P | 000000000 | 0000 |
| 1/2" | Fully Threaded | __ | Coarse | 3/8" | 1/4" | 3/16" | 160,000 | MS16997-58, NAS1352-4-8P | 000000000 | 0000 |
| 5/8" | Fully Threaded | __ | Coarse | 3/8" | 1/4" | 3/16" | 160,000 | MS16997-59, NAS1352-4-10P | 000000000 | 0000 |
| 3/4" | Fully Threaded | __ | Coarse | 3/8" | 1/4" | 3/16" | 160,000 | MS16997-60, NAS1352-4-12P | 000000000 | 0000 |
| 7/8" | Fully Threaded | __ | Coarse | 3/8" | 1/4" | 3/16" | 160,000 | MS16997-61, NAS1352-4-14P | 000000000 | 0000 |
| 1" | Fully Threaded | __ | Coarse | 3/8" | 1/4" | 3/16" | 160,000 | MS16997-62, NAS1352-4-16P | 000000000 | 0000 |
| 1 1/4" | Fully Threaded | __ | Coarse | 3/8" | 1/4" | 3/16" | 160,000 | MS16997-63, NAS1352-4-20P | 000000000 | 0000 |
| 1 1/2" | Partially Threaded | 1" | Coarse | 3/8" | 1/4" | 3/16" | 160,000 | MS16997-64, NAS1352-4-24P | 000000000 | 0000 |
| 1 3/4" | Partially Threaded | 1 1/4" | Coarse | 3/8" | 1/4" | 3/16" | 160,000 | MS16997-65, NAS1352-4-28P | 000000000 | 0000 |
| 2" | Partially Threaded | 1" | Coarse | 3/8" | 1/4" | 3/16" | 160,000 | MS16997-66, NAS1352-4-32P | 000000000 | 0000 |
| 2 1/4" | Partially Threaded | 1" | Coarse | 3/8" | 1/4" | 3/16" | 160,000 | MS16997-67, NAS1352-4-36P | 000000000 | 00000 |
| 2 1/2" | Partially Threaded | 1" | Coarse | 3/8" | 1/4" | 3/16" | 160,000 | MS16997-68, NAS1352-4-40P | 000000000 | 00000 |
5/16"-18 | ||||||||||
| 3/4" | Fully Threaded | __ | Coarse | 15/32" | 5/16" | 1/4" | 160,000 | MS16997-78, NAS1352-5-12P | 000000000 | 0000 |
| 7/8" | Fully Threaded | __ | Coarse | 15/32" | 5/16" | 1/4" | 160,000 | MS16997-79, NAS1352-5-14P | 000000000 | 0000 |
| 1" | Fully Threaded | __ | Coarse | 15/32" | 5/16" | 1/4" | 160,000 | MS16997-80, NAS1352-5-16P | 000000000 | 0000 |
| 1 1/4" | Fully Threaded | __ | Coarse | 15/32" | 5/16" | 1/4" | 160,000 | MS16997-81, NAS1352-5-20P | 000000000 | 0000 |
| 1 1/2" | Fully Threaded | __ | Coarse | 15/32" | 5/16" | 1/4" | 160,000 | MS16997-82, NAS1352-5-24P | 000000000 | 0000 |
| 1 3/4" | Partially Threaded | 1 1/8" | Coarse | 15/32" | 5/16" | 1/4" | 160,000 | MS16997-83, NAS1352-5-28P | 000000000 | 00000 |
| 2" | Partially Threaded | 1 3/8" | Coarse | 15/32" | 5/16" | 1/4" | 160,000 | MS16997-84, NAS1352-5-32P | 000000000 | 00000 |
| 2 1/2" | Partially Threaded | 1 3/8" | Coarse | 15/32" | 5/16" | 1/4" | 160,000 | MS16997-86, NAS1352-5-40P | 000000000 | 00000 |
3/8"-16 | ||||||||||
| 1/2" | Fully Threaded | __ | Coarse | 9/16" | 3/8" | 5/16" | 160,000 | MS16997-95, NAS1352-6-8P | 000000000 | 00000 |
| 3/4" | Fully Threaded | __ | Coarse | 9/16" | 3/8" | 5/16" | 160,000 | MS16997-97, NAS1352-6-12P | 000000000 | 00000 |
| 1" | Fully Threaded | __ | Coarse | 9/16" | 3/8" | 5/16" | 160,000 | MS16997-99, NAS1352-6-16P | 000000000 | 0000 |
| 1 1/4" | Fully Threaded | __ | Coarse | 9/16" | 3/8" | 5/16" | 160,000 | MS16997-100, NAS1352-6-20P | 000000000 | 0000 |
| 1 1/2" | Fully Threaded | __ | Coarse | 9/16" | 3/8" | 5/16" | 160,000 | MS16997-101, NAS1352-6-24P | 000000000 | 0000 |
| 1 3/4" | Partially Threaded | 1 1/4" | Coarse | 9/16" | 3/8" | 5/16" | 160,000 | MS16997-102, NAS1352-6-28P | 000000000 | 00000 |
| 2" | Partially Threaded | 1 1/2" | Coarse | 9/16" | 3/8" | 5/16" | 160,000 | MS16997-103, NAS1352-6-32P | 000000000 | 00000 |
| 2 1/4" | Partially Threaded | 1 1/4" | Coarse | 9/16" | 3/8" | 5/16" | 160,000 | MS16997-104, NAS1352-6-36P | 000000000 | 00000 |
| 2 1/2" | Partially Threaded | 1 1/2" | Coarse | 9/16" | 3/8" | 5/16" | 160,000 | MS16997-105, NAS1352-6-40P | 000000000 | 00000 |
| 2 3/4" | Partially Threaded | 1 1/4" | Coarse | 9/16" | 3/8" | 5/16" | 160,000 | MS16997-106, NAS1352-6-44P | 000000000 | 00000 |