Filter by
Military Specification
System of Measurement
Length
Material
Threading
Fastener Head Type
Specifications Met
Drive Style
Thread Direction
DFARS Specialty Metals
Thread Fit
Tensile Strength
Export Control Classification Number (ECCN)
REACH
RoHS
Hardness
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.
For technical drawings and 3-D models, click on a part number.
Head | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | Threading | Min. Thread Lg. | Thread Spacing  | Wd. | Ht. | Tensile Strength, psi | Specifications Met | Pkg. Qty. | Pkg. | |
1/4"-20 | ||||||||||
| 1/2" | Fully Threaded | __ | Coarse | 7/16" | 5/32" | 70,000 | Fed. Spec. FF-S-85, MS35307-303 | 10 | 000000000 | 00000 |
| 9/16" | Fully Threaded | __ | Coarse | 7/16" | 5/32" | 70,000 | Fed. Spec. FF-S-85, MS35307-304 | 10 | 000000000 | 00000 |
| 5/8" | Fully Threaded | __ | Coarse | 7/16" | 5/32" | 70,000 | Fed. Spec. FF-S-85, MS35307-305 | 10 | 000000000 | 00000 |
| 3/4" | Fully Threaded | __ | Coarse | 7/16" | 5/32" | 70,000 | Fed. Spec. FF-S-85, MS35307-306 | 10 | 000000000 | 0000 |
| 7/8" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 70,000 | Fed. Spec. FF-S-85, MS35307-307 | 10 | 000000000 | 0000 |
| 1" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 70,000 | Fed. Spec. FF-S-85, MS35307-308 | 10 | 000000000 | 00000 |
| 1 1/8" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 70,000 | Fed. Spec. FF-S-85, MS35307-309 | 10 | 000000000 | 00000 |
| 1 1/4" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 70,000 | Fed. Spec. FF-S-85, MS35307-310 | 10 | 000000000 | 00000 |
| 1 3/8" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 70,000 | Fed. Spec. FF-S-85, MS35307-311 | 10 | 000000000 | 00000 |
| 1 1/2" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 70,000 | Fed. Spec. FF-S-85, MS35307-312 | 5 | 000000000 | 0000 |
| 1 3/4" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 70,000 | Fed. Spec. FF-S-85, MS35307-313 | 5 | 000000000 | 00000 |
| 2" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 70,000 | Fed. Spec. FF-S-85, MS35307-314 | 5 | 000000000 | 00000 |
| 2 1/4" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 70,000 | Fed. Spec. FF-S-85, MS35307-315 | 5 | 000000000 | 00000 |
| 2 1/2" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 70,000 | Fed. Spec. FF-S-85, MS35307-316 | 5 | 000000000 | 00000 |
| 2 3/4" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 70,000 | Fed. Spec. FF-S-85, MS35307-317 | 5 | 000000000 | 00000 |
| 3" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 70,000 | Fed. Spec. FF-S-85, MS35307-318 | 5 | 000000000 | 00000 |
| 3 1/2" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 70,000 | Fed. Spec. FF-S-85, MS35307-320 | 5 | 000000000 | 00000 |
| 3 3/4" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 70,000 | Fed. Spec. FF-S-85, MS35307-321 | 1 | 000000000 | 0000 |
| 4" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 70,000 | Fed. Spec. FF-S-85, MS35307-322 | 1 | 000000000 | 0000 |
5/16"-18 | ||||||||||
| 1/2" | Fully Threaded | __ | Coarse | 1/2" | 13/64" | 70,000 | Fed. Spec. FF-S-85, MS35307-329 | 10 | 000000000 | 00000 |
| 5/8" | Fully Threaded | __ | Coarse | 1/2" | 13/64" | 70,000 | Fed. Spec. FF-S-85, MS35307-331 | 10 | 000000000 | 00000 |
| 3/4" | Fully Threaded | __ | Coarse | 1/2" | 13/64" | 70,000 | Fed. Spec. FF-S-85, MS35307-332 | 10 | 000000000 | 00000 |
| 7/8" | Fully Threaded | __ | Coarse | 1/2" | 13/64" | 70,000 | Fed. Spec. FF-S-85, MS35307-333 | 5 | 000000000 | 00000 |
| 1" | Partially Threaded | 7/8" | Coarse | 1/2" | 13/64" | 70,000 | Fed. Spec. FF-S-85, MS35307-334 | 5 | 000000000 | 0000 |
| 1 1/8" | Partially Threaded | 7/8" | Coarse | 1/2" | 13/64" | 70,000 | Fed. Spec. FF-S-85, MS35307-335 | 5 | 000000000 | 00000 |
| 1 1/4" | Partially Threaded | 7/8" | Coarse | 1/2" | 13/64" | 70,000 | Fed. Spec. FF-S-85, MS35307-336 | 5 | 000000000 | 0000 |
| 1 3/8" | Partially Threaded | 7/8" | Coarse | 1/2" | 13/64" | 70,000 | Fed. Spec. FF-S-85, MS35307-337 | 5 | 000000000 | 00000 |
| 1 1/2" | Partially Threaded | 7/8" | Coarse | 1/2" | 13/64" | 70,000 | Fed. Spec. FF-S-85, MS35307-338 | 5 | 000000000 | 00000 |
| 1 3/4" | Partially Threaded | 7/8" | Coarse | 1/2" | 13/64" | 70,000 | Fed. Spec. FF-S-85, MS35307-339 | 5 | 000000000 | 00000 |
| 2" | Partially Threaded | 7/8" | Coarse | 1/2" | 13/64" | 70,000 | Fed. Spec. FF-S-85, MS35307-340 | 1 | 000000000 | 0000 |
| 2 1/4" | Partially Threaded | 7/8" | Coarse | 1/2" | 13/64" | 70,000 | Fed. Spec. FF-S-85, MS35307-341 | 1 | 000000000 | 0000 |
| 2 1/2" | Partially Threaded | 7/8" | Coarse | 1/2" | 13/64" | 70,000 | Fed. Spec. FF-S-85, MS35307-342 | 1 | 000000000 | 0000 |
| 2 3/4" | Partially Threaded | 7/8" | Coarse | 1/2" | 13/64" | 70,000 | Fed. Spec. FF-S-85, MS35307-343 | 1 | 000000000 | 0000 |
| 3" | Partially Threaded | 7/8" | Coarse | 1/2" | 13/64" | 70,000 | Fed. Spec. FF-S-85, MS35307-344 | 1 | 000000000 | 0000 |
| 3 1/4" | Partially Threaded | 7/8" | Fine | 1/2" | 13/64" | 70,000 | Fed. Spec. FF-S-85, MS35307-345 | 1 | 000000000 | 0000 |
| 3 1/2" | Partially Threaded | 7/8" | Coarse | 1/2" | 13/64" | 70,000 | Fed. Spec. FF-S-85, MS35307-346 | 1 | 000000000 | 0000 |
3/8"-16 | ||||||||||
| 1/2" | Fully Threaded | __ | Coarse | 9/16" | 15/64" | 70,000 | Fed. Spec. FF-S-85, MS35307-355 | 5 | 000000000 | 00000 |
| 5/8" | Fully Threaded | __ | Coarse | 9/16" | 15/64" | 70,000 | Fed. Spec. FF-S-85, MS35307-357 | 5 | 000000000 | 00000 |
| 3/4" | Fully Threaded | __ | Coarse | 9/16" | 15/64" | 70,000 | Fed. Spec. FF-S-85, MS35307-358 | 5 | 000000000 | 00000 |
| 7/8" | Fully Threaded | __ | Coarse | 9/16" | 15/64" | 70,000 | Fed. Spec. FF-S-85, MS35307-359 | 5 | 000000000 | 00000 |
| 1" | Fully Threaded | __ | Coarse | 9/16" | 15/64" | 70,000 | Fed. Spec. FF-S-85, MS35307-360 | 5 | 000000000 | 00000 |
| 1 1/8" | Fully Threaded | __ | Coarse | 9/16" | 15/64" | 70,000 | Fed. Spec. FF-S-85, MS35307-361 | 5 | 000000000 | 00000 |
| 1 1/4" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 70,000 | Fed. Spec. FF-S-85, MS35307-362 | 1 | 000000000 | 0000 |
| 1 3/8" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 70,000 | Fed. Spec. FF-S-85, MS35307-363 | 1 | 000000000 | 0000 |
| 1 1/2" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 70,000 | Fed. Spec. FF-S-85, MS35307-364 | 1 | 000000000 | 0000 |
| 1 3/4" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 70,000 | Fed. Spec. FF-S-85, MS35307-365 | 1 | 000000000 | 0000 |
| 2" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 70,000 | Fed. Spec. FF-S-85, MS35307-366 | 1 | 000000000 | 0000 |
| 2 1/4" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 70,000 | Fed. Spec. FF-S-85, MS35307-367 | 1 | 000000000 | 0000 |
| 2 1/2" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 70,000 | Fed. Spec. FF-S-85, MS35307-368 | 1 | 000000000 | 0000 |
| 2 3/4" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 70,000 | Fed. Spec. FF-S-85, MS35307-369 | 1 | 000000000 | 0000 |
| 3" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 70,000 | Fed. Spec. FF-S-85, MS35307-370 | 1 | 000000000 | 0000 |
| 3 1/2" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 70,000 | Fed. Spec. FF-S-85, MS35307-372 | 1 | 000000000 | 0000 |
| 3 3/4" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 70,000 | Fed. Spec. FF-S-85, MS35307-373 | 1 | 000000000 | 0000 |
1/2"-13 | ||||||||||
| 3/4" | Fully Threaded | __ | Coarse | 3/4" | 5/16" | 70,000 | Fed. Spec. FF-S-85, MS35307-407 | 1 | 000000000 | 0000 |
| 1" | Fully Threaded | __ | Coarse | 3/4" | 5/16" | 70,000 | Fed. Spec. FF-S-85, MS35307-409 | 1 | 000000000 | 0000 |
| 1 1/8" | Fully Threaded | __ | Coarse | 3/4" | 5/16" | 70,000 | Fed. Spec. FF-S-85, MS35307-410 | 1 | 000000000 | 0000 |
| 1 1/4" | Fully Threaded | __ | Coarse | 3/4" | 5/16" | 70,000 | Fed. Spec. FF-S-85, MS35307-411 | 1 | 000000000 | 0000 |
| 1 3/8" | Fully Threaded | __ | Coarse | 3/4" | 5/16" | 70,000 | Fed. Spec. FF-S-85, MS35307-412 | 1 | 000000000 | 0000 |
| 1 1/2" | Partially Threaded | 1 1/4" | Coarse | 3/4" | 5/16" | 70,000 | Fed. Spec. FF-S-85, MS35307-413 | 1 | 000000000 | 0000 |
| 1 3/4" | Partially Threaded | 1 1/4" | Coarse | 3/4" | 5/16" | 70,000 | Fed. Spec. FF-S-85, MS35307-414 | 1 | 000000000 | 0000 |
| 2" | Partially Threaded | 1 1/4" | Coarse | 3/4" | 5/16" | 70,000 | Fed. Spec. FF-S-85, MS35307-415 | 1 | 000000000 | 0000 |
| 2 1/4" | Partially Threaded | 1 1/4" | Coarse | 3/4" | 5/16" | 70,000 | Fed. Spec. FF-S-85, MS35307-416 | 1 | 000000000 | 00000 |
| 2 1/2" | Partially Threaded | 1 1/4" | Coarse | 3/4" | 5/16" | 70,000 | Fed. Spec. FF-S-85, MS35307-417 | 1 | 000000000 | 0000 |
| 2 3/4" | Partially Threaded | 1 1/4" | Coarse | 3/4" | 5/16" | 70,000 | Fed. Spec. FF-S-85, MS35307-418 | 1 | 000000000 | 0000 |
| 3" | Partially Threaded | 1 1/4" | Coarse | 3/4" | 5/16" | 70,000 | Fed. Spec. FF-S-85, MS35307-419 | 1 | 000000000 | 0000 |
5/8"-11 | ||||||||||
| 1" | Fully Threaded | __ | Coarse | 15/16" | 25/64" | 70,000 | Fed. Spec. FF-S-85, MS35307-458 | 1 | 000000000 | 00000 |
| 1 1/4" | Fully Threaded | __ | Coarse | 15/16" | 25/64" | 70,000 | Fed. Spec. FF-S-85, MS35307-460 | 1 | 000000000 | 00000 |
| 1 1/2" | Fully Threaded | __ | Coarse | 15/16" | 25/64" | 70,000 | Fed. Spec. FF-S-85, MS35307-462 | 1 | 000000000 | 00000 |
| 1 3/4" | Partially Threaded | 1 1/2" | Coarse | 15/16" | 25/64" | 70,000 | Fed. Spec. FF-S-85, MS35307-463 | 1 | 000000000 | 00000 |
| 2" | Partially Threaded | 1 1/2" | Coarse | 15/16" | 25/64" | 70,000 | Fed. Spec. FF-S-85, MS35307-464 | 1 | 000000000 | 00000 |
| 2 1/4" | Partially Threaded | 1 1/2" | Coarse | 15/16" | 25/64" | 70,000 | Fed. Spec. FF-S-85, MS35307-465 | 1 | 000000000 | 00000 |
| 2 1/2" | Partially Threaded | 1 1/2" | Coarse | 15/16" | 25/64" | 70,000 | Fed. Spec. FF-S-85, MS35307-466 | 1 | 000000000 | 00000 |
| 2 3/4" | Partially Threaded | 1 1/2" | Coarse | 15/16" | 25/64" | 70,000 | Fed. Spec. FF-S-85, MS35307-467 | 1 | 000000000 | 00000 |
| 3" | Partially Threaded | 1 1/2" | Coarse | 15/16" | 25/64" | 70,000 | Fed. Spec. FF-S-85, MS35307-468 | 1 | 000000000 | 00000 |
| 3 1/2" | Partially Threaded | 1 1/2" | Coarse | 15/16" | 25/64" | 70,000 | Fed. Spec. FF-S-85, MS35307-470 | 1 | 000000000 | 00000 |
| 4" | Partially Threaded | 1 1/2" | Coarse | 15/16" | 25/64" | 70,000 | Fed. Spec. FF-S-85, MS35307-472 | 1 | 000000000 | 00000 |
3/4"-10 | ||||||||||
| 1 1/2" | Fully Threaded | __ | Coarse | 1 1/8" | 15/32" | 70,000 | Fed. Spec. FF-S-85, MS35307-485 | 1 | 000000000 | 00000 |
| 2" | Fully Threaded | __ | Coarse | 1 1/8" | 15/32" | 70,000 | Fed. Spec. FF-S-85, MS35307-487 | 1 | 000000000 | 00000 |
| 2 1/4" | Partially Threaded | 1 3/4" | Coarse | 1 1/8" | 15/32" | 70,000 | Fed. Spec. FF-S-85, MS35307-488 | 1 | 000000000 | 00000 |
| 2 1/2" | Partially Threaded | 1 3/4" | Coarse | 1 1/8" | 15/32" | 70,000 | Fed. Spec. FF-S-85, MS35307-489 | 1 | 000000000 | 00000 |
| 3" | Partially Threaded | 1 3/4" | Coarse | 1 1/8" | 15/32" | 70,000 | Fed. Spec. FF-S-85, MS35307-491 | 1 | 000000000 | 00000 |