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About Hex Head Screws and Bolts
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Super-Corrosion-Resistant 316 Stainless Steel Heavy
Hex Head Screws for High-Pressure Applications
Fully Threaded
Partially Threaded
Made from 316 stainless steel, these Grade B8M screws are more corrosion resistant than 18-8 stainless steel screws and have excellent resistance to chemicals and salt water. They may be mildly magnetic. Also known as pressure bolts, these screws meet the high-pressure and high-temperature regulations of ASTM A193 and are used to secure pressure tanks, valves, and flanges. Length is measured from under the head. Screws should be used with Grade 8M nuts.
Partially threaded screws come with threaded and unthreaded portions, allowing you to place only the stronger unthreaded portion (grip) in joints subjected to sideways forces.
For technical drawings and 3-D models, click on a part number.
Screws | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Head | 316 Stainless Steel Hex Nuts | ||||||||||||
| Lg. | Threading | Thread Spacing  | Thread Lg. | Grip Lg. | Wd. | Ht. | Tensile Strength, psi | Specifications Met | Each | Pkg. Qty. | Pkg. | ||
ASTM Grade B8M 316 Stainless Steel | |||||||||||||
3/8"-16 | |||||||||||||
| 1" | Fully Threaded | Coarse | __ | __ | 9/16" | 15/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 5 | 000000000 | 00000 |
| 1 1/4" | Fully Threaded | Coarse | __ | __ | 9/16" | 15/64" | 75,000 | ASTM A193 | 000000000 | 0000 | 5 | 000000000 | 0000 |
| 1 3/4" | Partially Threaded | Coarse | 1" | 3/4" | 9/16" | 15/64" | 75,000 | ASTM A193 | 000000000 | 0000 | 5 | 000000000 | 0000 |
| 2" | Partially Threaded | Coarse | 1" | 1" | 9/16" | 15/64" | 75,000 | ASTM A193 | 000000000 | 0000 | 5 | 000000000 | 0000 |
| 2 1/4" | Partially Threaded | Coarse | 1" | 1 1/4" | 9/16" | 15/64" | 75,000 | ASTM A193 | 000000000 | 0000 | 5 | 000000000 | 0000 |
| 2 1/2" | Partially Threaded | Coarse | 1" | 1 1/2" | 9/16" | 15/64" | 75,000 | ASTM A193 | 000000000 | 0000 | 5 | 000000000 | 0000 |
| 2 3/4" | Partially Threaded | Coarse | 1" | 1 3/4" | 9/16" | 15/64" | 75,000 | ASTM A193 | 000000000 | 0000 | 5 | 000000000 | 0000 |
| 3" | Partially Threaded | Coarse | 1" | 2" | 9/16" | 15/64" | 75,000 | ASTM A193 | 000000000 | 0000 | 5 | 000000000 | 0000 |
| 4" | Partially Threaded | Coarse | 1" | 3" | 9/16" | 15/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 5 | 000000000 | 0000 |
| 6" | Partially Threaded | Coarse | 1" | 5" | 9/16" | 15/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 5 | 000000000 | 0000 |
1/2"-13 | |||||||||||||
| 1" | Fully Threaded | Coarse | __ | __ | 7/8" | 5/16" | 75,000 | ASTM A193 | 000000000 | 0000 | 5 | 000000000 | 0000 |
| 1 1/4" | Fully Threaded | Coarse | __ | __ | 7/8" | 5/16" | 75,000 | ASTM A193 | 000000000 | 0000 | 5 | 000000000 | 0000 |
| 1 1/2" | Partially Threaded | Coarse | 1" | 1/2" | 7/8" | 5/16" | 75,000 | ASTM A193 | 000000000 | 0000 | 5 | 000000000 | 0000 |
| 1 3/4" | Partially Threaded | Coarse | 1" | 3/4" | 7/8" | 5/16" | 75,000 | ASTM A193 | 000000000 | 0000 | 5 | 000000000 | 0000 |
| 2" | Partially Threaded | Coarse | 1 1/4" | 3/4" | 7/8" | 5/16" | 75,000 | ASTM A193 | 000000000 | 0000 | 5 | 000000000 | 0000 |
| 2 1/4" | Partially Threaded | Coarse | 1 1/4" | 1" | 7/8" | 5/16" | 75,000 | ASTM A193 | 000000000 | 0000 | 5 | 000000000 | 0000 |
| 2 1/2" | Partially Threaded | Coarse | 1 1/4" | 1 1/4" | 7/8" | 5/16" | 75,000 | ASTM A193 | 000000000 | 0000 | 5 | 000000000 | 0000 |
| 2 3/4" | Partially Threaded | Coarse | 1 1/4" | 1 1/2" | 7/8" | 5/16" | 75,000 | ASTM A193 | 000000000 | 0000 | 5 | 000000000 | 0000 |
| 3" | Partially Threaded | Coarse | 1 1/4" | 1 3/4" | 7/8" | 5/16" | 75,000 | ASTM A193 | 000000000 | 0000 | 5 | 000000000 | 0000 |
| 3 1/2" | Partially Threaded | Coarse | 1 1/4" | 2 1/4" | 7/8" | 5/16" | 75,000 | ASTM A193 | 000000000 | 0000 | 5 | 000000000 | 0000 |
| 3 3/4" | Partially Threaded | Coarse | 1 1/4" | 2 1/2" | 7/8" | 5/16" | 75,000 | ASTM A193 | 000000000 | 0000 | 5 | 000000000 | 0000 |
| 4" | Partially Threaded | Coarse | 1 1/4" | 2 3/4" | 7/8" | 5/16" | 75,000 | ASTM A193 | 000000000 | 0000 | 5 | 000000000 | 0000 |
| 4 1/4" | Partially Threaded | Coarse | 1 1/4" | 3" | 7/8" | 5/16" | 75,000 | ASTM A193 | 000000000 | 00000 | 5 | 000000000 | 0000 |
| 6" | Partially Threaded | Coarse | 1 1/4" | 4 3/4" | 7/8" | 5/16" | 75,000 | ASTM A193 | 000000000 | 00000 | 5 | 000000000 | 0000 |
| 7" | Partially Threaded | Coarse | 1 1/2" | 5 1/2" | 7/8" | 5/16" | 75,000 | ASTM A193 | 000000000 | 00000 | 5 | 000000000 | 0000 |
| 8" | Partially Threaded | Coarse | 1 1/2" | 6 1/2" | 7/8" | 5/16" | 75,000 | ASTM A193 | 000000000 | 00000 | 5 | 000000000 | 0000 |
5/8"-11 | |||||||||||||
| 1 1/4" | Fully Threaded | Coarse | __ | __ | 1 1/16" | 25/64" | 75,000 | ASTM A193 | 000000000 | 0000 | 1 | 000000000 | 0000 |
| 1 1/2" | Fully Threaded | Coarse | __ | __ | 1 1/16" | 25/64" | 75,000 | ASTM A193 | 000000000 | 0000 | 1 | 000000000 | 0000 |
| 1 3/4" | Fully Threaded | Coarse | __ | __ | 1 1/16" | 25/64" | 75,000 | ASTM A193 | 000000000 | 0000 | 1 | 000000000 | 0000 |
| 2" | Partially Threaded | Coarse | 1 1/2" | 1/2" | 1 1/16" | 25/64" | 75,000 | ASTM A193 | 000000000 | 0000 | 1 | 000000000 | 0000 |
| 2 1/4" | Partially Threaded | Coarse | 1 1/2" | 3/4" | 1 1/16" | 25/64" | 75,000 | ASTM A193 | 000000000 | 0000 | 1 | 000000000 | 0000 |
| 2 1/2" | Partially Threaded | Coarse | 1 1/2" | 1" | 1 1/16" | 25/64" | 75,000 | ASTM A193 | 000000000 | 0000 | 1 | 000000000 | 0000 |
| 2 3/4" | Partially Threaded | Coarse | 1 1/2" | 1 1/4" | 1 1/16" | 25/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 3" | Partially Threaded | Coarse | 1 1/2" | 1 1/2" | 1 1/16" | 25/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 3 1/4" | Partially Threaded | Coarse | 1 1/2" | 1 3/4" | 1 1/16" | 25/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 3 1/2" | Partially Threaded | Coarse | 1 1/2" | 2" | 1 1/16" | 25/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 3 3/4" | Partially Threaded | Coarse | 1 1/2" | 2 1/4" | 1 1/16" | 25/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 4" | Partially Threaded | Coarse | 1 1/2" | 2 1/2" | 1 1/16" | 25/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 4 1/2" | Partially Threaded | Coarse | 1 1/2" | 3" | 1 1/16" | 25/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 5" | Partially Threaded | Coarse | 1 1/2" | 3 1/2" | 1 1/16" | 25/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 5 1/2" | Partially Threaded | Coarse | 1 1/2" | 4" | 1 1/16" | 25/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 6" | Partially Threaded | Coarse | 1 1/2" | 4 1/2" | 1 1/16" | 25/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
3/4"-10 | |||||||||||||
| 1 1/2" | Fully Threaded | Coarse | __ | __ | 1 1/4" | 15/32" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 1 3/4" | Fully Threaded | Coarse | __ | __ | 1 1/4" | 15/32" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 2" | Fully Threaded | Coarse | __ | __ | 1 1/4" | 15/32" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 2 1/4" | Partially Threaded | Coarse | 1 3/4" | 1/2" | 1 1/4" | 15/32" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 2 1/2" | Partially Threaded | Coarse | 1 3/4" | 3/4" | 1 1/4" | 15/32" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 3" | Partially Threaded | Coarse | 1 3/4" | 1 1/4" | 1 1/4" | 15/32" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 3 1/2" | Partially Threaded | Coarse | 1 3/4" | 1 3/4" | 1 1/4" | 15/32" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 3 3/4" | Partially Threaded | Coarse | 1 3/4" | 2" | 1 1/4" | 15/32" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 4" | Partially Threaded | Coarse | 1 3/4" | 2 1/4" | 1 1/4" | 15/32" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 4 1/4" | Partially Threaded | Coarse | 1 3/4" | 2 1/2" | 1 1/4" | 15/32" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 4 3/4" | Partially Threaded | Coarse | 1 3/4" | 3" | 1 1/4" | 15/32" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 5 1/4" | Partially Threaded | Coarse | 1 3/4" | 3 1/2" | 1 1/4" | 15/32" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 5 1/2" | Partially Threaded | Coarse | 1 3/4" | 3 3/4" | 1 1/4" | 15/32" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 5 3/4" | Partially Threaded | Coarse | 1 3/4" | 4" | 1 1/4" | 15/32" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 6" | Partially Threaded | Coarse | 1 3/4" | 4 1/4" | 1 1/4" | 15/32" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 6 1/2" | Partially Threaded | Coarse | 1 3/4" | 4 3/4" | 1 1/4" | 15/32" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 6 3/4" | Partially Threaded | Coarse | 1 3/4" | 5" | 1 1/4" | 15/32" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
7/8"-9 | |||||||||||||
| 2 1/2" | Partially Threaded | Coarse | 2" | 1/2" | 1 7/16" | 35/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 3 1/2" | Partially Threaded | Coarse | 2" | 1 1/2" | 1 7/16" | 35/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 4 1/2" | Partially Threaded | Coarse | 2" | 2 1/2" | 1 7/16" | 35/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 4 3/4" | Partially Threaded | Coarse | 2" | 2 3/4" | 1 7/16" | 35/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 5" | Partially Threaded | Coarse | 2" | 3" | 1 7/16" | 35/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
1"-8 | |||||||||||||
| 2" | Fully Threaded | Coarse | __ | __ | 1 5/8" | 39/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 3" | Partially Threaded | Coarse | 2" | 1" | 1 5/8" | 39/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 4" | Partially Threaded | Coarse | 2" | 2" | 1 5/8" | 39/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 4 1/4" | Partially Threaded | Coarse | 2" | 2 1/4" | 1 5/8" | 39/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 5" | Partially Threaded | Coarse | 2" | 3" | 1 5/8" | 39/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 5 1/2" | Partially Threaded | Coarse | 2" | 3 1/2" | 1 5/8" | 39/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 6" | Partially Threaded | Coarse | 2" | 4" | 1 5/8" | 39/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |