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About Hex Head Screws and Bolts
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18-8 Stainless Steel Hex Head Screws
Fully Threaded
Partially Threaded
The standard choice for fastening in wet and outdoor conditions. Made of 18-8 stainless steel, these screws resist corrosion from mild chemicals and water. These screws may be mildly magnetic. Length is measured from under the head.
Screws that are made in the U.S. are headed and threaded domestically using DFARS-compliant materials. Those that meet MS35307 or MS35308 adhere to military standards for material and construction; their dimensions also meet Fed. Spec. FF-S-85.
Match the thread spacing of mating components. Coarse threads are the industry standard; choose these screws if you don’t know the pitch or threads per inch.
Head | Made in the U.S. | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Lg. | Threading | Min. Thread Lg. | Thread Spacing  | Wd. | Ht. | Tensile Strength, psi | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | |||||||||
1/4"-20 | |||||||||
| 1/2" | Fully Threaded | __ | Coarse | 7/16" | 5/32" | 70,000 | 10 | 000000000 | 00000 |
| 9/16" | Fully Threaded | __ | Coarse | 7/16" | 5/32" | 70,000 | 10 | 000000000 | 0000 |
| 5/8" | Fully Threaded | __ | Coarse | 7/16" | 5/32" | 70,000 | 10 | 000000000 | 0000 |
| 3/4" | Fully Threaded | __ | Coarse | 7/16" | 5/32" | 70,000 | 10 | 000000000 | 0000 |
| 7/8" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 70,000 | 10 | 000000000 | 0000 |
| 1" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 70,000 | 10 | 000000000 | 00000 |
| 1 1/8" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 70,000 | 10 | 000000000 | 00000 |
| 1 1/4" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 70,000 | 10 | 000000000 | 00000 |
| 1 3/8" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 70,000 | 10 | 000000000 | 00000 |
| 1 1/2" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 70,000 | 5 | 000000000 | 0000 |
| 1 3/4" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 70,000 | 5 | 000000000 | 00000 |
| 2" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 70,000 | 5 | 000000000 | 0000 |
| 2 1/4" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 70,000 | 5 | 000000000 | 00000 |
| 2 1/2" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 70,000 | 5 | 000000000 | 00000 |
| 2 3/4" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 70,000 | 5 | 000000000 | 00000 |
| 3" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 70,000 | 5 | 000000000 | 00000 |
| 3 1/2" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 70,000 | 5 | 000000000 | 00000 |
| 3 3/4" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 70,000 | 1 | 000000000 | 0000 |
| 4" | Partially Threaded | 3/4" | Coarse | 7/16" | 5/32" | 70,000 | 1 | 000000000 | 0000 |
5/16"-18 | |||||||||
| 1/2" | Fully Threaded | __ | Coarse | 1/2" | 13/64" | 70,000 | 10 | 000000000 | 00000 |
| 5/8" | Fully Threaded | __ | Coarse | 1/2" | 13/64" | 70,000 | 10 | 000000000 | 00000 |
| 3/4" | Fully Threaded | __ | Coarse | 1/2" | 13/64" | 70,000 | 10 | 000000000 | 00000 |
| 7/8" | Fully Threaded | __ | Coarse | 1/2" | 13/64" | 70,000 | 5 | 000000000 | 0000 |
| 1" | Partially Threaded | 7/8" | Coarse | 1/2" | 13/64" | 70,000 | 5 | 000000000 | 0000 |
| 1 1/8" | Partially Threaded | 7/8" | Coarse | 1/2" | 13/64" | 70,000 | 5 | 000000000 | 00000 |
| 1 1/4" | Partially Threaded | 7/8" | Coarse | 1/2" | 13/64" | 70,000 | 5 | 000000000 | 0000 |
| 1 3/8" | Partially Threaded | 7/8" | Coarse | 1/2" | 13/64" | 70,000 | 5 | 000000000 | 00000 |
| 1 1/2" | Partially Threaded | 7/8" | Coarse | 1/2" | 13/64" | 70,000 | 5 | 000000000 | 00000 |
| 1 3/4" | Partially Threaded | 7/8" | Coarse | 1/2" | 13/64" | 70,000 | 5 | 000000000 | 00000 |
| 2" | Partially Threaded | 7/8" | Coarse | 1/2" | 13/64" | 70,000 | 1 | 000000000 | 0000 |
| 2 1/4" | Partially Threaded | 7/8" | Coarse | 1/2" | 13/64" | 70,000 | 1 | 000000000 | 0000 |
| 2 1/2" | Partially Threaded | 7/8" | Coarse | 1/2" | 13/64" | 70,000 | 1 | 000000000 | 0000 |
| 2 3/4" | Partially Threaded | 7/8" | Coarse | 1/2" | 13/64" | 70,000 | 1 | 000000000 | 0000 |
| 3" | Partially Threaded | 7/8" | Coarse | 1/2" | 13/64" | 70,000 | 1 | 000000000 | 0000 |
| 3 1/4" | Partially Threaded | 7/8" | Coarse | 1/2" | 13/64" | 70,000 | 1 | 000000000 | 0000 |
| 3 1/2" | Partially Threaded | 7/8" | Coarse | 1/2" | 13/64" | 70,000 | 1 | 000000000 | 0000 |
3/8"-16 | |||||||||
| 1/2" | Fully Threaded | __ | Coarse | 9/16" | 15/64" | 70,000 | 5 | 000000000 | 00000 |
| 5/8" | Fully Threaded | __ | Coarse | 9/16" | 15/64" | 70,000 | 5 | 000000000 | 00000 |
| 3/4" | Fully Threaded | __ | Coarse | 9/16" | 15/64" | 70,000 | 5 | 000000000 | 00000 |
| 7/8" | Fully Threaded | __ | Coarse | 9/16" | 15/64" | 70,000 | 5 | 000000000 | 00000 |
| 1" | Fully Threaded | __ | Coarse | 9/16" | 15/64" | 70,000 | 5 | 000000000 | 00000 |
| 1 1/8" | Fully Threaded | __ | Coarse | 9/16" | 15/64" | 70,000 | 5 | 000000000 | 00000 |
| 1 1/4" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 70,000 | 1 | 000000000 | 0000 |
| 1 3/8" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 70,000 | 1 | 000000000 | 0000 |
| 1 1/2" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 70,000 | 1 | 000000000 | 0000 |
| 1 3/4" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 70,000 | 1 | 000000000 | 0000 |
| 2" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 70,000 | 1 | 000000000 | 0000 |
| 2 1/4" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 70,000 | 1 | 000000000 | 0000 |
| 2 1/2" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 70,000 | 1 | 000000000 | 0000 |
| 2 3/4" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 70,000 | 1 | 000000000 | 0000 |
| 3" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 70,000 | 1 | 000000000 | 0000 |
| 3 1/2" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 70,000 | 1 | 000000000 | 0000 |
| 3 3/4" | Partially Threaded | 1" | Coarse | 9/16" | 15/64" | 70,000 | 1 | 000000000 | 0000 |
1/2"-13 | |||||||||
| 3/4" | Fully Threaded | __ | Coarse | 3/4" | 5/16" | 70,000 | 1 | 000000000 | 0000 |
| 1" | Fully Threaded | __ | Coarse | 3/4" | 5/16" | 70,000 | 1 | 000000000 | 0000 |
| 1 1/8" | Fully Threaded | __ | Coarse | 3/4" | 5/16" | 70,000 | 1 | 000000000 | 0000 |
| 1 1/4" | Fully Threaded | __ | Coarse | 3/4" | 5/16" | 70,000 | 1 | 000000000 | 0000 |
| 1 3/8" | Fully Threaded | __ | Coarse | 3/4" | 5/16" | 70,000 | 1 | 000000000 | 0000 |
| 1 1/2" | Partially Threaded | 1 1/4" | Coarse | 3/4" | 5/16" | 70,000 | 1 | 000000000 | 0000 |
| 1 3/4" | Partially Threaded | 1 1/4" | Coarse | 3/4" | 5/16" | 70,000 | 1 | 000000000 | 0000 |
| 2" | Partially Threaded | 1 1/4" | Coarse | 3/4" | 5/16" | 70,000 | 1 | 000000000 | 0000 |
| 2 1/4" | Partially Threaded | 1 1/4" | Coarse | 3/4" | 5/16" | 70,000 | 1 | 000000000 | 0000 |
| 2 1/2" | Partially Threaded | 1 1/4" | Coarse | 3/4" | 5/16" | 70,000 | 1 | 000000000 | 0000 |
| 2 3/4" | Partially Threaded | 1 1/4" | Coarse | 3/4" | 5/16" | 70,000 | 1 | 000000000 | 0000 |
| 3" | Partially Threaded | 1 1/4" | Coarse | 3/4" | 5/16" | 70,000 | 1 | 000000000 | 0000 |
5/8"-11 | |||||||||
| 1" | Fully Threaded | __ | Coarse | 15/16" | 25/64" | 70,000 | 1 | 000000000 | 00000 |
| 1 1/4" | Fully Threaded | __ | Coarse | 15/16" | 25/64" | 70,000 | 1 | 000000000 | 00000 |
| 1 1/2" | Fully Threaded | __ | Coarse | 15/16" | 25/64" | 70,000 | 1 | 000000000 | 00000 |
| 1 3/4" | Partially Threaded | 1 1/2" | Coarse | 15/16" | 25/64" | 70,000 | 1 | 000000000 | 00000 |
| 2" | Partially Threaded | 1 1/2" | Coarse | 15/16" | 25/64" | 70,000 | 1 | 000000000 | 00000 |
| 2 1/4" | Partially Threaded | 1 1/2" | Coarse | 15/16" | 25/64" | 70,000 | 1 | 000000000 | 00000 |
| 2 1/2" | Partially Threaded | 1 1/2" | Coarse | 15/16" | 25/64" | 70,000 | 1 | 000000000 | 00000 |
| 2 3/4" | Partially Threaded | 1 1/2" | Coarse | 15/16" | 25/64" | 70,000 | 1 | 000000000 | 00000 |
| 3" | Partially Threaded | 1 1/2" | Coarse | 15/16" | 25/64" | 70,000 | 1 | 000000000 | 00000 |
| 3 1/2" | Partially Threaded | 1 1/2" | Coarse | 15/16" | 25/64" | 70,000 | 1 | 000000000 | 00000 |
| 4" | Partially Threaded | 1 1/2" | Coarse | 15/16" | 25/64" | 70,000 | 1 | 000000000 | 00000 |
3/4"-10 | |||||||||
| 1 1/2" | Fully Threaded | __ | Coarse | 1 1/8" | 15/32" | 70,000 | 1 | 000000000 | 00000 |
| 2" | Fully Threaded | __ | Coarse | 1 1/8" | 15/32" | 70,000 | 1 | 000000000 | 00000 |
| 2 1/4" | Partially Threaded | 1 3/4" | Coarse | 1 1/8" | 15/32" | 70,000 | 1 | 000000000 | 00000 |
| 2 1/2" | Partially Threaded | 1 3/4" | Coarse | 1 1/8" | 15/32" | 70,000 | 1 | 000000000 | 00000 |
| 3" | Partially Threaded | 1 3/4" | Coarse | 1 1/8" | 15/32" | 70,000 | 1 | 000000000 | 00000 |