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About Hex Head Screws and Bolts
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18-8 Stainless Steel Heavy Hex Head Screws for High-Pressure Applications
Fully Threaded
Partially Threaded
These Grade B8 screws are made from 18-8 stainless steel and have good chemical resistance. 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 ASTM A194 Grade 8 nuts.
Partially threaded screws come with precise threaded and unthreaded portions, allowing you to place only the stronger unthreaded portion (grip) in joints subjected to sideways forces.
Screws | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Head | 18-8 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 B8 18-8 Stainless Steel | |||||||||||||
3/8"-16 | |||||||||||||
| 1" | Fully Threaded | Coarse | __ | __ | 9/16" | 15/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 10 | 000000000 | 00000 |
| 1 1/4" | Fully Threaded | Coarse | __ | __ | 9/16" | 15/64" | 75,000 | ASTM A193 | 000000000 | 0000 | 10 | 000000000 | 0000 |
| 1 1/2" | Partially Threaded | Coarse | 1" | 1/2" | 9/16" | 15/64" | 75,000 | ASTM A193 | 000000000 | 0000 | 10 | 000000000 | 0000 |
| 1 3/4" | Partially Threaded | Coarse | 1" | 3/4" | 9/16" | 15/64" | 75,000 | ASTM A193 | 000000000 | 0000 | 10 | 000000000 | 0000 |
| 2" | Partially Threaded | Coarse | 1" | 1" | 9/16" | 15/64" | 75,000 | ASTM A193 | 000000000 | 0000 | 10 | 000000000 | 0000 |
| 2 1/4" | Partially Threaded | Coarse | 1" | 1 1/4" | 9/16" | 15/64" | 75,000 | ASTM A193 | 000000000 | 0000 | 10 | 000000000 | 0000 |
| 2 1/2" | Partially Threaded | Coarse | 1" | 1 1/2" | 9/16" | 15/64" | 75,000 | ASTM A193 | 000000000 | 0000 | 10 | 000000000 | 0000 |
| 2 3/4" | Partially Threaded | Coarse | 1" | 1 3/4" | 9/16" | 15/64" | 75,000 | ASTM A193 | 000000000 | 0000 | 10 | 000000000 | 0000 |
| 3" | Partially Threaded | Coarse | 1" | 2" | 9/16" | 15/64" | 75,000 | ASTM A193 | 000000000 | 0000 | 10 | 000000000 | 0000 |
| 4" | Partially Threaded | Coarse | 1" | 3" | 9/16" | 15/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 10 | 000000000 | 0000 |
| 4 1/2" | Partially Threaded | Coarse | 1" | 3 1/2" | 9/16" | 15/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 10 | 000000000 | 0000 |
| 5" | Partially Threaded | Coarse | 1" | 4" | 9/16" | 15/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 10 | 000000000 | 0000 |
| 6" | Partially Threaded | Coarse | 1" | 5" | 9/16" | 15/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 10 | 000000000 | 0000 |
| 7" | Partially Threaded | Coarse | 1 1/4" | 5 3/4" | 9/16" | 15/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 10 | 000000000 | 0000 |
| 8" | Partially Threaded | Coarse | 1 1/4" | 6 3/4" | 9/16" | 15/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 10 | 000000000 | 0000 |
1/2"-13 | |||||||||||||
| 1" | Fully Threaded | Coarse | __ | __ | 7/8" | 11/32" | 75,000 | ASTM A193 | 000000000 | 0000 | 10 | 000000000 | 00000 |
| 1 1/4" | Fully Threaded | Coarse | __ | __ | 7/8" | 5/16" | 75,000 | ASTM A193 | 000000000 | 0000 | 10 | 000000000 | 00000 |
| 1 1/2" | Fully Threaded | Coarse | __ | __ | 7/8" | 5/16" | 75,000 | ASTM A193 | 000000000 | 0000 | 10 | 000000000 | 00000 |
| 1 3/4" | Partially Threaded | Coarse | 1 1/4" | 1/2" | 7/8" | 11/32" | 75,000 | ASTM A193 | 000000000 | 0000 | 10 | 000000000 | 00000 |
| 2" | Partially Threaded | Coarse | 1 1/4" | 3/4" | 7/8" | 5/16" | 75,000 | ASTM A193 | 000000000 | 0000 | 10 | 000000000 | 00000 |
| 2 1/4" | Partially Threaded | Coarse | 1 1/4" | 1" | 7/8" | 5/16" | 75,000 | ASTM A193 | 000000000 | 0000 | 10 | 000000000 | 00000 |
| 2 1/2" | Partially Threaded | Coarse | 1 1/4" | 1 1/4" | 7/8" | 5/16" | 75,000 | ASTM A193 | 000000000 | 0000 | 10 | 000000000 | 00000 |
| 2 3/4" | Partially Threaded | Coarse | 1 1/4" | 1 1/2" | 7/8" | 5/16" | 75,000 | ASTM A193 | 000000000 | 0000 | 10 | 000000000 | 00000 |
| 3" | Partially Threaded | Coarse | 1 1/4" | 1 3/4" | 7/8" | 5/16" | 75,000 | ASTM A193 | 000000000 | 0000 | 10 | 000000000 | 00000 |
| 3 1/4" | Partially Threaded | Coarse | 1 1/4" | 2" | 7/8" | 5/16" | 75,000 | ASTM A193 | 000000000 | 0000 | 10 | 000000000 | 00000 |
| 3 1/2" | Partially Threaded | Coarse | 1 1/4" | 2 1/4" | 7/8" | 5/16" | 75,000 | ASTM A193 | 000000000 | 0000 | 10 | 000000000 | 00000 |
| 3 3/4" | Partially Threaded | Coarse | 1 1/4" | 2 1/2" | 7/8" | 5/16" | 75,000 | ASTM A193 | 000000000 | 0000 | 10 | 000000000 | 00000 |
| 4" | Partially Threaded | Coarse | 1 1/4" | 2 3/4" | 7/8" | 5/16" | 75,000 | ASTM A193 | 000000000 | 0000 | 10 | 000000000 | 00000 |
| 4 1/4" | Partially Threaded | Coarse | 1 1/4" | 3" | 7/8" | 5/16" | 75,000 | ASTM A193 | 000000000 | 0000 | 10 | 000000000 | 00000 |
| 4 1/2" | Partially Threaded | Coarse | 1 1/4" | 3 1/4" | 7/8" | 5/16" | 75,000 | ASTM A193 | 000000000 | 0000 | 10 | 000000000 | 00000 |
| 5" | Partially Threaded | Coarse | 1 1/4" | 3 3/4" | 7/8" | 5/16" | 75,000 | ASTM A193 | 000000000 | 00000 | 10 | 000000000 | 00000 |
| 6" | Partially Threaded | Coarse | 1 1/4" | 4 3/4" | 7/8" | 5/16" | 75,000 | ASTM A193 | 000000000 | 00000 | 10 | 000000000 | 00000 |
| 7" | Partially Threaded | Coarse | 1 1/2" | 5 1/2" | 7/8" | 5/16" | 75,000 | ASTM A193 | 000000000 | 00000 | 10 | 000000000 | 00000 |
| 8" | Partially Threaded | Coarse | 1 1/2" | 6 1/2" | 7/8" | 5/16" | 75,000 | ASTM A193 | 000000000 | 00000 | 10 | 000000000 | 00000 |
| 9" | Partially Threaded | Coarse | 1 1/2" | 7 1/2" | 7/8" | 5/16" | 75,000 | ASTM A193 | 000000000 | 00000 | 10 | 000000000 | 00000 |
5/8"-11 | |||||||||||||
| 1" | Fully Threaded | Coarse | __ | __ | 1 1/16" | 25/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 5 | 000000000 | 00000 |
| 1 1/4" | Fully Threaded | Coarse | __ | __ | 1 1/16" | 25/64" | 75,000 | ASTM A193 | 000000000 | 0000 | 5 | 000000000 | 00000 |
| 1 1/2" | Fully Threaded | Coarse | __ | __ | 1 1/16" | 25/64" | 75,000 | ASTM A193 | 000000000 | 0000 | 5 | 000000000 | 00000 |
| 1 3/4" | Partially Threaded | Coarse | 1 1/2" | 1/4" | 1 1/16" | 25/64" | 75,000 | ASTM A193 | 000000000 | 0000 | 5 | 000000000 | 00000 |
| 2" | Partially Threaded | Coarse | 1 1/2" | 1/2" | 1 1/16" | 25/64" | 75,000 | ASTM A193 | 000000000 | 0000 | 5 | 000000000 | 00000 |
| 2 1/4" | Partially Threaded | Coarse | 1 1/2" | 3/4" | 1 1/16" | 25/64" | 75,000 | ASTM A193 | 000000000 | 0000 | 5 | 000000000 | 00000 |
| 2 1/2" | Partially Threaded | Coarse | 1 1/2" | 1" | 1 1/16" | 25/64" | 75,000 | ASTM A193 | 000000000 | 0000 | 5 | 000000000 | 00000 |
| 2 3/4" | Partially Threaded | Coarse | 1 1/2" | 1 1/4" | 1 1/16" | 25/64" | 75,000 | ASTM A193 | 000000000 | 0000 | 5 | 000000000 | 00000 |
| 3" | Partially Threaded | Coarse | 1 1/2" | 1 1/2" | 1 1/16" | 25/64" | 75,000 | ASTM A193 | 000000000 | 0000 | 5 | 000000000 | 00000 |
| 3 1/4" | Partially Threaded | Coarse | 1 1/2" | 1 3/4" | 1 1/16" | 25/64" | 75,000 | ASTM A193 | 000000000 | 0000 | 5 | 000000000 | 00000 |
| 3 1/2" | Partially Threaded | Coarse | 1 1/2" | 2" | 1 1/16" | 25/64" | 75,000 | ASTM A193 | 000000000 | 0000 | 5 | 000000000 | 00000 |
| 3 3/4" | Partially Threaded | Coarse | 1 1/2" | 2 1/4" | 1 1/16" | 25/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 5 | 000000000 | 00000 |
| 4" | Partially Threaded | Coarse | 1 1/2" | 2 1/2" | 1 1/16" | 25/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 5 | 000000000 | 00000 |
| 4 1/4" | Partially Threaded | Coarse | 1 1/2" | 2 3/4" | 1 1/16" | 25/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 5 | 000000000 | 00000 |
| 4 1/2" | Partially Threaded | Coarse | 1 1/2" | 3" | 1 1/16" | 25/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 5 | 000000000 | 00000 |
| 4 3/4" | Partially Threaded | Coarse | 1 1/2" | 3 1/4" | 1 1/16" | 25/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 5 | 000000000 | 00000 |
| 5" | Partially Threaded | Coarse | 1 1/2" | 3 1/2" | 1 1/16" | 25/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 5 | 000000000 | 00000 |
| 5 1/2" | Partially Threaded | Coarse | 1 1/2" | 4" | 1 1/16" | 25/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 5 | 000000000 | 00000 |
| 6" | Partially Threaded | Coarse | 1 1/2" | 4 1/2" | 1 1/16" | 25/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 5 | 000000000 | 00000 |
| 7" | Partially Threaded | Coarse | 1 3/4" | 5 1/4" | 1 1/16" | 25/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 5 | 000000000 | 00000 |
| 8" | Partially Threaded | Coarse | 1 3/4" | 6 1/4" | 1 1/16" | 25/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 5 | 000000000 | 00000 |
3/4"-10 | |||||||||||||
| 1" | Fully Threaded | Coarse | __ | __ | 1 1/4" | 15/32" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 1 1/4" | Fully Threaded | Coarse | __ | __ | 1 1/4" | 15/32" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 1 1/2" | Fully Threaded | Coarse | __ | __ | 1 1/4" | 15/32" | 75,000 | ASTM A193 | 000000000 | 0000 | 1 | 000000000 | 0000 |
| 1 3/4" | Fully Threaded | Coarse | __ | __ | 1 1/4" | 15/32" | 75,000 | ASTM A193 | 000000000 | 0000 | 1 | 000000000 | 0000 |
| 2" | Fully Threaded | Coarse | __ | __ | 1 1/4" | 15/32" | 75,000 | ASTM A193 | 000000000 | 0000 | 1 | 000000000 | 0000 |
| 2 1/4" | Partially Threaded | Coarse | 1 3/4" | 1/2" | 1 1/4" | 15/32" | 75,000 | ASTM A193 | 000000000 | 0000 | 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 |
| 2 3/4" | Partially Threaded | Coarse | 1 3/4" | 1" | 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 1/4" | Partially Threaded | Coarse | 1 3/4" | 1 1/2" | 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 1/2" | Partially Threaded | Coarse | 1 3/4" | 2 3/4" | 1 1/4" | 15/32" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 5" | Partially Threaded | Coarse | 1 3/4" | 3 1/4" | 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 |
| 6" | Partially Threaded | Coarse | 1 3/4" | 4 1/4" | 1 1/4" | 15/32" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 7" | Partially Threaded | Coarse | 2" | 5" | 1 1/4" | 15/32" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 8" | Partially Threaded | Coarse | 2" | 6" | 1 1/4" | 15/32" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
7/8"-9 | |||||||||||||
| 1" | Fully Threaded | Coarse | __ | __ | 1 7/16" | 35/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 1 1/4" | Fully Threaded | Coarse | __ | __ | 1 7/16" | 35/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 1 1/2" | Fully Threaded | Coarse | __ | __ | 1 7/16" | 35/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 1 3/4" | Fully Threaded | Coarse | __ | __ | 1 7/16" | 35/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 2" | Fully Threaded | Coarse | __ | __ | 1 7/16" | 35/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 2 1/4" | Partially Threaded | Coarse | 2" | 1/4" | 1 7/16" | 35/64" | 75,000 | ASTM A193 | 000000000 | 00000 | 1 | 000000000 | 0000 |