Filter by
Military Specification
Material
Threading
Fastener Head Type
System of Measurement
Specifications Met
Drive Style
Tensile Strength
Thread Direction
Hardness
DFARS Specialty Metals
Thread Fit
RoHS
Export Control Classification Number (ECCN)
REACH
About Hex Head Screws and Bolts
More
Mil. Spec. 18-8 Stainless Steel Hex Head Screws
Fully Threaded
Partially Threaded
Choose these screws for their adherence to strict military standards for material and construction. Made from 18-8 stainless steel, they have good chemical resistance and may be mildly magnetic. Dimensions meet Fed. Spec. FF-S-85 specifications. Length is measured from under the head.
Match the thread spacing of mating components. Coarse threads are the industry standard; choose these screws if you don’t know the threads per inch. Fine threads are closely spaced to prevent loosening from vibration.
Head | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | Threading | Min. Thread Lg. | Thread Spacing  | Wd. | Ht. | Tensile Strength, psi | Specifications Met | Pkg. Qty. | Pkg. | |
1/4"-28 | ||||||||||
| 1/2" | Fully Threaded | __ | Fine | 7/16" | 5/32" | 70,000 | Fed. Spec. FF-S-85, MS35308-303 | 10 | 000000000 | 00000 |
| 9/16" | Fully Threaded | __ | Fine | 7/16" | 5/32" | 70,000 | Fed. Spec. FF-S-85, MS35308-304 | 10 | 000000000 | 0000 |
| 5/8" | Fully Threaded | __ | Fine | 7/16" | 5/32" | 70,000 | Fed. Spec. FF-S-85, MS35308-305 | 10 | 000000000 | 00000 |
| 3/4" | Fully Threaded | __ | Fine | 7/16" | 5/32" | 70,000 | Fed. Spec. FF-S-85, MS35308-306 | 10 | 000000000 | 0000 |
| 7/8" | Fully Threaded | __ | Fine | 7/16" | 5/32" | 70,000 | Fed. Spec. FF-S-85, MS35308-307 | 10 | 000000000 | 00000 |
| 1" | Partially Threaded | 3/4" | Fine | 7/16" | 5/32" | 70,000 | Fed. Spec. FF-S-85, MS35308-308 | 10 | 000000000 | 0000 |
| 1 1/8" | Partially Threaded | 3/4" | Fine | 7/16" | 5/32" | 70,000 | Fed. Spec. FF-S-85, MS35308-309 | 10 | 000000000 | 00000 |
| 1 1/4" | Partially Threaded | 3/4" | Fine | 7/16" | 5/32" | 70,000 | Fed. Spec. FF-S-85, MS35308-310 | 10 | 000000000 | 00000 |
| 1 3/8" | Partially Threaded | 3/4" | Fine | 7/16" | 5/32" | 70,000 | Fed. Spec. FF-S-85, MS35308-311 | 10 | 000000000 | 00000 |
| 1 1/2" | Partially Threaded | 3/4" | Fine | 7/16" | 5/32" | 70,000 | Fed. Spec. FF-S-85, MS35308-312 | 10 | 000000000 | 00000 |
| 1 3/4" | Partially Threaded | 3/4" | Fine | 7/16" | 5/32" | 70,000 | Fed. Spec. FF-S-85, MS35308-313 | 10 | 000000000 | 00000 |
| 2" | Partially Threaded | 3/4" | Fine | 7/16" | 5/32" | 70,000 | Fed. Spec. FF-S-85, MS35308-314 | 5 | 000000000 | 00000 |
| 2 1/4" | Partially Threaded | 3/4" | Fine | 7/16" | 5/32" | 70,000 | Fed. Spec. FF-S-85, MS35308-315 | 5 | 000000000 | 00000 |
| 2 1/2" | Partially Threaded | 3/4" | Fine | 7/16" | 5/32" | 70,000 | Fed. Spec. FF-S-85, MS35308-316 | 5 | 000000000 | 00000 |
| 3" | Partially Threaded | 3/4" | Fine | 7/16" | 5/32" | 70,000 | Fed. Spec. FF-S-85, MS35308-318 | 5 | 000000000 | 00000 |
5/16"-24 | ||||||||||
| 5/8" | Fully Threaded | __ | Fine | 1/2" | 13/64" | 70,000 | Fed. Spec. FF-S-85, MS35308-331 | 10 | 000000000 | 00000 |
| 3/4" | Fully Threaded | __ | Fine | 1/2" | 13/64" | 70,000 | Fed. Spec. FF-S-85, MS35308-332 | 5 | 000000000 | 0000 |
| 7/8" | Fully Threaded | __ | Fine | 1/2" | 13/64" | 70,000 | Fed. Spec. FF-S-85, MS35308-333 | 5 | 000000000 | 00000 |
| 1" | Partially Threaded | 7/8" | Fine | 1/2" | 13/64" | 70,000 | Fed. Spec. FF-S-85, MS35308-334 | 5 | 000000000 | 00000 |
| 1 1/8" | Partially Threaded | 7/8" | Fine | 1/2" | 13/64" | 70,000 | Fed. Spec. FF-S-85, MS35308-335 | 5 | 000000000 | 00000 |
| 1 1/4" | Partially Threaded | 7/8" | Fine | 1/2" | 13/64" | 70,000 | Fed. Spec. FF-S-85, MS35308-336 | 5 | 000000000 | 00000 |
| 1 3/8" | Partially Threaded | 7/8" | Fine | 1/2" | 13/64" | 70,000 | Fed. Spec. FF-S-85, MS35308-337 | 5 | 000000000 | 00000 |
| 1 1/2" | Partially Threaded | 7/8" | Fine | 1/2" | 13/64" | 70,000 | Fed. Spec. FF-S-85, MS35308-338 | 5 | 000000000 | 00000 |
| 1 3/4" | Partially Threaded | 7/8" | Fine | 1/2" | 13/64" | 70,000 | Fed. Spec. FF-S-85, MS35308-339 | 5 | 000000000 | 00000 |
| 2" | Partially Threaded | 7/8" | Fine | 1/2" | 13/64" | 70,000 | Fed. Spec. FF-S-85, MS35308-340 | 1 | 000000000 | 0000 |
| 2 1/4" | Partially Threaded | 7/8" | Fine | 1/2" | 13/64" | 70,000 | Fed. Spec. FF-S-85, MS35308-341 | 1 | 000000000 | 0000 |
| 2 1/2" | Partially Threaded | 7/8" | Fine | 1/2" | 13/64" | 70,000 | Fed. Spec. FF-S-85, MS35308-342 | 1 | 000000000 | 0000 |
| 2 3/4" | Partially Threaded | 7/8" | Fine | 1/2" | 13/64" | 70,000 | Fed. Spec. FF-S-85, MS35308-343 | 1 | 000000000 | 0000 |
3/8"-24 | ||||||||||
| 5/8" | Fully Threaded | __ | Fine | 9/16" | 15/64" | 70,000 | Fed. Spec. FF-S-85, MS35308-357 | 5 | 000000000 | 0000 |
| 3/4" | Fully Threaded | __ | Fine | 9/16" | 15/64" | 70,000 | Fed. Spec. FF-S-85, MS35308-358 | 5 | 000000000 | 00000 |
| 7/8" | Fully Threaded | __ | Fine | 9/16" | 15/64" | 70,000 | Fed. Spec. FF-S-85, MS35308-359 | 5 | 000000000 | 00000 |
| 1" | Fully Threaded | __ | Fine | 9/16" | 15/64" | 70,000 | Fed. Spec. FF-S-85, MS35308-360 | 5 | 000000000 | 00000 |
| 1 1/8" | Fully Threaded | __ | Fine | 9/16" | 15/64" | 70,000 | Fed. Spec. FF-S-85, MS35308-361 | 1 | 000000000 | 0000 |
| 1 1/4" | Partially Threaded | 1" | Fine | 9/16" | 15/64" | 70,000 | Fed. Spec. FF-S-85, MS35308-362 | 1 | 000000000 | 0000 |
| 1 3/8" | Partially Threaded | 1" | Fine | 9/16" | 15/64" | 70,000 | Fed. Spec. FF-S-85, MS35308-363 | 1 | 000000000 | 0000 |
| 1 1/2" | Partially Threaded | 1" | Fine | 9/16" | 15/64" | 70,000 | Fed. Spec. FF-S-85, MS35308-364 | 1 | 000000000 | 0000 |
| 1 3/4" | Partially Threaded | 1" | Fine | 9/16" | 15/64" | 70,000 | Fed. Spec. FF-S-85, MS35308-365 | 1 | 000000000 | 0000 |
| 2" | Partially Threaded | 1" | Fine | 9/16" | 15/64" | 70,000 | Fed. Spec. FF-S-85, MS35308-366 | 1 | 000000000 | 0000 |
| 2 1/4" | Partially Threaded | 1" | Fine | 9/16" | 15/64" | 70,000 | Fed. Spec. FF-S-85, MS35308-367 | 1 | 000000000 | 0000 |
| 2 1/2" | Partially Threaded | 1" | Fine | 9/16" | 15/64" | 70,000 | Fed. Spec. FF-S-85, MS35308-368 | 1 | 000000000 | 0000 |
| 3" | Partially Threaded | 1" | Fine | 9/16" | 15/64" | 70,000 | Fed. Spec. FF-S-85, MS35308-370 | 1 | 000000000 | 0000 |
1/2"-20 | ||||||||||
| 3/4" | Fully Threaded | __ | Fine | 3/4" | 5/16" | 70,000 | Fed. Spec. FF-S-85, MS35308-407 | 1 | 000000000 | 0000 |
| 1" | Fully Threaded | __ | Fine | 3/4" | 5/16" | 70,000 | Fed. Spec. FF-S-85, MS35308-409 | 1 | 000000000 | 0000 |
| 1 1/8" | Fully Threaded | __ | Fine | 3/4" | 5/16" | 70,000 | Fed. Spec. FF-S-85, MS35308-410 | 1 | 000000000 | 0000 |
| 1 1/4" | Fully Threaded | __ | Fine | 3/4" | 5/16" | 70,000 | Fed. Spec. FF-S-85, MS35308-411 | 1 | 000000000 | 0000 |
| 1 1/2" | Partially Threaded | 1 1/4" | Fine | 3/4" | 5/16" | 70,000 | Fed. Spec. FF-S-85, MS35308-413 | 1 | 000000000 | 0000 |
| 1 3/4" | Partially Threaded | 1 1/4" | Fine | 3/4" | 5/16" | 70,000 | Fed. Spec. FF-S-85, MS35308-414 | 1 | 000000000 | 0000 |
| 2" | Partially Threaded | 1 1/4" | Fine | 3/4" | 5/16" | 70,000 | Fed. Spec. FF-S-85, MS35308-415 | 1 | 000000000 | 0000 |
| 2 1/4" | Partially Threaded | 1 1/4" | Fine | 3/4" | 5/16" | 70,000 | Fed. Spec. FF-S-85, MS35308-416 | 1 | 000000000 | 00000 |
| 2 1/2" | Partially Threaded | 1 1/4" | Fine | 3/4" | 5/16" | 70,000 | Fed. Spec. FF-S-85, MS35308-417 | 1 | 000000000 | 00000 |
| 2 3/4" | Partially Threaded | 1 1/4" | Coarse | 3/4" | 5/16" | 70,000 | Fed. Spec. FF-S-85, MS35308-418 | 1 | 000000000 | 00000 |
| 3" | Partially Threaded | 1 1/4" | Coarse | 3/4" | 5/16" | 70,000 | Fed. Spec. FF-S-85, MS35308-419 | 1 | 000000000 | 00000 |