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About Hex Head Screws and Bolts
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Choose a hex head fastener with the right threading, thread size, material, and strength for your equipment.
About Nuts, Materials, and Finishes
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18-8 Stainless Steel Heavy Hex Head Screws for High-Pressure Applications
Fully Threaded
Partially Threaded
Made of 18-8 stainless steel, these Grade B8 screws resist corrosion from mild chemicals and water. They may be mildly magnetic. Also known as pressure bolts, these screws meet the high-pressure and high-temperature regulations of ASTM A193. They’re often used to secure pressure tanks, valves, and flanges. Length is measured from under the head. Use these screws with ASTM A194 Grade 8 nuts (sold separately).
Partially threaded screws have a precisely measured unthreaded section under the head, called a grip. It’s stronger than the threaded section, so you can place it in joints subjected to sideways force.
Screws | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Head | 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, ASTM A962 | 92655A331 | 00000 | 10 | 94252A709 | 00000 |
| 1 1/4" | Fully Threaded | Coarse | __ | __ | 9/16" | 15/64" | 75,000 | ASTM A193, ASTM A962 | 92655A338 | 0000 | 10 | 94252A709 | 0000 |
| 1 1/2" | Partially Threaded | Coarse | 1" | 1/2" | 9/16" | 15/64" | 75,000 | ASTM A193, ASTM A962 | 92655A345 | 0000 | 10 | 94252A709 | 0000 |
| 1 3/4" | Partially Threaded | Coarse | 1" | 3/4" | 9/16" | 15/64" | 75,000 | ASTM A193, ASTM A962 | 92655A352 | 0000 | 10 | 94252A709 | 0000 |
| 2" | Partially Threaded | Coarse | 1" | 1" | 9/16" | 15/64" | 75,000 | ASTM A193, ASTM A962 | 92655A601 | 0000 | 10 | 94252A709 | 0000 |
| 2 1/4" | Partially Threaded | Coarse | 1" | 1 1/4" | 9/16" | 15/64" | 75,000 | ASTM A193, ASTM A962 | 92655A602 | 0000 | 10 | 94252A709 | 0000 |
| 2 1/2" | Partially Threaded | Coarse | 1" | 1 1/2" | 9/16" | 15/64" | 75,000 | ASTM A193, ASTM A962 | 92655A603 | 0000 | 10 | 94252A709 | 0000 |
| 2 3/4" | Partially Threaded | Coarse | 1" | 1 3/4" | 9/16" | 15/64" | 75,000 | ASTM A193, ASTM A962 | 92655A604 | 0000 | 10 | 94252A709 | 0000 |
| 3" | Partially Threaded | Coarse | 1" | 2" | 9/16" | 15/64" | 75,000 | ASTM A193, ASTM A962 | 92655A605 | 0000 | 10 | 94252A709 | 0000 |
| 4" | Partially Threaded | Coarse | 1" | 3" | 9/16" | 15/64" | 75,000 | ASTM A193, ASTM A962 | 92655A606 | 00000 | 10 | 94252A709 | 0000 |
| 4 1/2" | Partially Threaded | Coarse | 1" | 3 1/2" | 9/16" | 15/64" | 75,000 | ASTM A193, ASTM A962 | 92655A607 | 00000 | 10 | 94252A709 | 0000 |
| 5" | Partially Threaded | Coarse | 1" | 4" | 9/16" | 15/64" | 75,000 | ASTM A193, ASTM A962 | 92655A608 | 00000 | 10 | 94252A709 | 0000 |
| 6" | Partially Threaded | Coarse | 1" | 5" | 9/16" | 15/64" | 75,000 | ASTM A193, ASTM A962 | 92655A609 | 00000 | 10 | 94252A709 | 0000 |
| 7" | Partially Threaded | Coarse | 1 1/4" | 5 3/4" | 9/16" | 15/64" | 75,000 | ASTM A193, ASTM A962 | 92655A611 | 00000 | 10 | 94252A709 | 0000 |
| 8" | Partially Threaded | Coarse | 1 1/4" | 6 3/4" | 9/16" | 15/64" | 75,000 | ASTM A193, ASTM A962 | 92655A612 | 00000 | 10 | 94252A709 | 0000 |
1/2"-13 | |||||||||||||
| 1" | Fully Threaded | Coarse | __ | __ | 7/8" | 11/32" | 75,000 | ASTM A193, ASTM A962 | 92655A399 | 0000 | 10 | 94252A712 | 00000 |
| 1 1/4" | Fully Threaded | Coarse | __ | __ | 7/8" | 5/16" | 75,000 | ASTM A193, ASTM A962 | 92655A401 | 0000 | 10 | 94252A712 | 00000 |
| 1 1/2" | Fully Threaded | Coarse | __ | __ | 7/8" | 5/16" | 75,000 | ASTM A193, ASTM A962 | 92655A405 | 0000 | 10 | 94252A712 | 00000 |
| 1 3/4" | Partially Threaded | Coarse | 1 1/4" | 1/2" | 7/8" | 11/32" | 75,000 | ASTM A193, ASTM A962 | 92655A408 | 0000 | 10 | 94252A712 | 00000 |
| 2" | Partially Threaded | Coarse | 1 1/4" | 3/4" | 7/8" | 5/16" | 75,000 | ASTM A193, ASTM A962 | 92655A412 | 0000 | 10 | 94252A712 | 00000 |
| 2 1/4" | Partially Threaded | Coarse | 1 1/4" | 1" | 7/8" | 5/16" | 75,000 | ASTM A193, ASTM A962 | 92655A613 | 0000 | 10 | 94252A712 | 00000 |
| 2 1/2" | Partially Threaded | Coarse | 1 1/4" | 1 1/4" | 7/8" | 5/16" | 75,000 | ASTM A193, ASTM A962 | 92655A416 | 0000 | 10 | 94252A712 | 00000 |
| 2 3/4" | Partially Threaded | Coarse | 1 1/4" | 1 1/2" | 7/8" | 5/16" | 75,000 | ASTM A193, ASTM A962 | 92655A614 | 0000 | 10 | 94252A712 | 00000 |
| 3" | Partially Threaded | Coarse | 1 1/4" | 1 3/4" | 7/8" | 5/16" | 75,000 | ASTM A193, ASTM A962 | 92655A419 | 0000 | 10 | 94252A712 | 00000 |
| 3 1/4" | Partially Threaded | Coarse | 1 1/4" | 2" | 7/8" | 5/16" | 75,000 | ASTM A193, ASTM A962 | 92655A615 | 0000 | 10 | 94252A712 | 00000 |
| 3 1/2" | Partially Threaded | Coarse | 1 1/4" | 2 1/4" | 7/8" | 5/16" | 75,000 | ASTM A193, ASTM A962 | 92655A423 | 0000 | 10 | 94252A712 | 00000 |
| 3 3/4" | Partially Threaded | Coarse | 1 1/4" | 2 1/2" | 7/8" | 5/16" | 75,000 | ASTM A193, ASTM A962 | 92655A616 | 0000 | 10 | 94252A712 | 00000 |
| 4" | Partially Threaded | Coarse | 1 1/4" | 2 3/4" | 7/8" | 5/16" | 75,000 | ASTM A193, ASTM A962 | 92655A426 | 0000 | 10 | 94252A712 | 00000 |
| 4 1/4" | Partially Threaded | Coarse | 1 1/4" | 3" | 7/8" | 5/16" | 75,000 | ASTM A193, ASTM A962 | 92655A617 | 0000 | 10 | 94252A712 | 00000 |
| 4 1/2" | Partially Threaded | Coarse | 1 1/4" | 3 1/4" | 7/8" | 5/16" | 75,000 | ASTM A193, ASTM A962 | 92655A618 | 0000 | 10 | 94252A712 | 00000 |
| 5" | Partially Threaded | Coarse | 1 1/4" | 3 3/4" | 7/8" | 5/16" | 75,000 | ASTM A193, ASTM A962 | 92655A619 | 00000 | 10 | 94252A712 | 00000 |
| 5 1/2" | Partially Threaded | Coarse | 1 1/4" | 4 1/4" | 7/8" | 11/32" | 75,000 | ASTM A193, ASTM A962 | 92655A124 | 00000 | 10 | 94252A712 | 00000 |
| 6" | Partially Threaded | Coarse | 1 1/4" | 4 3/4" | 7/8" | 5/16" | 75,000 | ASTM A193, ASTM A962 | 92655A621 | 00000 | 10 | 94252A712 | 00000 |
| 6 1/2" | Partially Threaded | Coarse | 1 1/2" | 5" | 7/8" | 11/32" | 75,000 | ASTM A193, ASTM A962 | 92655A126 | 00000 | 10 | 94252A712 | 00000 |
| 7" | Partially Threaded | Coarse | 1 1/2" | 5 1/2" | 7/8" | 5/16" | 75,000 | ASTM A193, ASTM A962 | 92655A709 | 00000 | 10 | 94252A712 | 00000 |
| 8" | Partially Threaded | Coarse | 1 1/2" | 6 1/2" | 7/8" | 5/16" | 75,000 | ASTM A193, ASTM A962 | 92655A622 | 00000 | 10 | 94252A712 | 00000 |
| 9" | Partially Threaded | Coarse | 1 1/2" | 7 1/2" | 7/8" | 5/16" | 75,000 | ASTM A193, ASTM A962 | 92655A623 | 00000 | 10 | 94252A712 | 00000 |
5/8"-11 | |||||||||||||
| 1" | Fully Threaded | Coarse | __ | __ | 1 1/16" | 25/64" | 75,000 | ASTM A193, ASTM A962 | 92655A625 | 00000 | 5 | 94252A715 | 00000 |
| 1 1/4" | Fully Threaded | Coarse | __ | __ | 1 1/16" | 25/64" | 75,000 | ASTM A193, ASTM A962 | 92655A626 | 0000 | 5 | 94252A715 | 00000 |
| 1 1/2" | Fully Threaded | Coarse | __ | __ | 1 1/16" | 25/64" | 75,000 | ASTM A193, ASTM A962 | 92655A443 | 0000 | 5 | 94252A715 | 00000 |
| 1 3/4" | Partially Threaded | Coarse | 1 1/2" | 1/4" | 1 1/16" | 25/64" | 75,000 | ASTM A193, ASTM A962 | 92655A627 | 0000 | 5 | 94252A715 | 00000 |
| 2" | Partially Threaded | Coarse | 1 1/2" | 1/2" | 1 1/16" | 25/64" | 75,000 | ASTM A193, ASTM A962 | 92655A451 | 0000 | 5 | 94252A715 | 00000 |
| 2 1/4" | Partially Threaded | Coarse | 1 1/2" | 3/4" | 1 1/16" | 25/64" | 75,000 | ASTM A193, ASTM A962 | 92655A628 | 0000 | 5 | 94252A715 | 00000 |
| 2 1/2" | Partially Threaded | Coarse | 1 1/2" | 1" | 1 1/16" | 25/64" | 75,000 | ASTM A193, ASTM A962 | 92655A629 | 0000 | 5 | 94252A715 | 00000 |
| 2 3/4" | Partially Threaded | Coarse | 1 1/2" | 1 1/4" | 1 1/16" | 25/64" | 75,000 | ASTM A193, ASTM A962 | 92655A631 | 0000 | 5 | 94252A715 | 00000 |
| 3" | Partially Threaded | Coarse | 1 1/2" | 1 1/2" | 1 1/16" | 25/64" | 75,000 | ASTM A193, ASTM A962 | 92655A456 | 0000 | 5 | 94252A715 | 00000 |
| 3 1/4" | Partially Threaded | Coarse | 1 1/2" | 1 3/4" | 1 1/16" | 25/64" | 75,000 | ASTM A193, ASTM A962 | 92655A632 | 0000 | 5 | 94252A715 | 00000 |
| 3 1/2" | Partially Threaded | Coarse | 1 1/2" | 2" | 1 1/16" | 25/64" | 75,000 | ASTM A193, ASTM A962 | 92655A461 | 0000 | 5 | 94252A715 | 00000 |
| 3 3/4" | Partially Threaded | Coarse | 1 1/2" | 2 1/4" | 1 1/16" | 25/64" | 75,000 | ASTM A193, ASTM A962 | 92655A633 | 00000 | 5 | 94252A715 | 00000 |
| 4" | Partially Threaded | Coarse | 1 1/2" | 2 1/2" | 1 1/16" | 25/64" | 75,000 | ASTM A193, ASTM A962 | 92655A465 | 00000 | 5 | 94252A715 | 00000 |
| 4 1/4" | Partially Threaded | Coarse | 1 1/2" | 2 3/4" | 1 1/16" | 25/64" | 75,000 | ASTM A193, ASTM A962 | 92655A634 | 00000 | 5 | 94252A715 | 00000 |
| 4 1/2" | Partially Threaded | Coarse | 1 1/2" | 3" | 1 1/16" | 25/64" | 75,000 | ASTM A193, ASTM A962 | 92655A635 | 00000 | 5 | 94252A715 | 00000 |
| 4 3/4" | Partially Threaded | Coarse | 1 1/2" | 3 1/4" | 1 1/16" | 25/64" | 75,000 | ASTM A193, ASTM A962 | 92655A636 | 00000 | 5 | 94252A715 | 00000 |
| 5" | Partially Threaded | Coarse | 1 1/2" | 3 1/2" | 1 1/16" | 25/64" | 75,000 | ASTM A193, ASTM A962 | 92655A637 | 00000 | 5 | 94252A715 | 00000 |
| 5 1/2" | Partially Threaded | Coarse | 1 1/2" | 4" | 1 1/16" | 25/64" | 75,000 | ASTM A193, ASTM A962 | 92655A638 | 00000 | 5 | 94252A715 | 00000 |
| 6" | Partially Threaded | Coarse | 1 1/2" | 4 1/2" | 1 1/16" | 25/64" | 75,000 | ASTM A193, ASTM A962 | 92655A639 | 00000 | 5 | 94252A715 | 00000 |
| 7" | Partially Threaded | Coarse | 1 3/4" | 5 1/4" | 1 1/16" | 25/64" | 75,000 | ASTM A193, ASTM A962 | 92655A641 | 00000 | 5 | 94252A715 | 00000 |
| 8" | Partially Threaded | Coarse | 1 3/4" | 6 1/4" | 1 1/16" | 25/64" | 75,000 | ASTM A193, ASTM A962 | 92655A642 | 00000 | 5 | 94252A715 | 00000 |
3/4"-10 | |||||||||||||
| 1" | Fully Threaded | Coarse | __ | __ | 1 1/4" | 15/32" | 75,000 | ASTM A193, ASTM A962 | 92655A645 | 00000 | 1 | 94252A719 | 0000 |
| 1 1/4" | Fully Threaded | Coarse | __ | __ | 1 1/4" | 15/32" | 75,000 | ASTM A193, ASTM A962 | 92655A646 | 00000 | 1 | 94252A719 | 0000 |
| 1 1/2" | Fully Threaded | Coarse | __ | __ | 1 1/4" | 15/32" | 75,000 | ASTM A193, ASTM A962 | 92655A481 | 0000 | 1 | 94252A719 | 0000 |
| 1 3/4" | Fully Threaded | Coarse | __ | __ | 1 1/4" | 15/32" | 75,000 | ASTM A193, ASTM A962 | 92655A647 | 0000 | 1 | 94252A719 | 0000 |
| 2" | Fully Threaded | Coarse | __ | __ | 1 1/4" | 15/32" | 75,000 | ASTM A193, ASTM A962 | 92655A486 | 0000 | 1 | 94252A719 | 0000 |
| 2 1/4" | Partially Threaded | Coarse | 1 3/4" | 1/2" | 1 1/4" | 15/32" | 75,000 | ASTM A193, ASTM A962 | 92655A648 | 0000 | 1 | 94252A719 | 0000 |
| 2 1/2" | Partially Threaded | Coarse | 1 3/4" | 3/4" | 1 1/4" | 15/32" | 75,000 | ASTM A193, ASTM A962 | 92655A489 | 00000 | 1 | 94252A719 | 0000 |
| 2 3/4" | Partially Threaded | Coarse | 1 3/4" | 1" | 1 1/4" | 15/32" | 75,000 | ASTM A193, ASTM A962 | 92655A649 | 00000 | 1 | 94252A719 | 0000 |
| 3" | Partially Threaded | Coarse | 1 3/4" | 1 1/4" | 1 1/4" | 15/32" | 75,000 | ASTM A193, ASTM A962 | 92655A492 | 00000 | 1 | 94252A719 | 0000 |
| 3 1/4" | Partially Threaded | Coarse | 1 3/4" | 1 1/2" | 1 1/4" | 15/32" | 75,000 | ASTM A193, ASTM A962 | 92655A651 | 00000 | 1 | 94252A719 | 0000 |
| 3 1/2" | Partially Threaded | Coarse | 1 3/4" | 1 3/4" | 1 1/4" | 15/32" | 75,000 | ASTM A193, ASTM A962 | 92655A495 | 00000 | 1 | 94252A719 | 0000 |
| 3 3/4" | Partially Threaded | Coarse | 1 3/4" | 2" | 1 1/4" | 15/32" | 75,000 | ASTM A193, ASTM A962 | 92655A652 | 00000 | 1 | 94252A719 | 0000 |
| 4" | Partially Threaded | Coarse | 1 3/4" | 2 1/4" | 1 1/4" | 15/32" | 75,000 | ASTM A193, ASTM A962 | 92655A499 | 00000 | 1 | 94252A719 | 0000 |
| 4 1/4" | Partially Threaded | Coarse | 1 3/4" | 2 1/2" | 1 1/4" | 15/32" | 75,000 | ASTM A193, ASTM A962 | 92655A653 | 00000 | 1 | 94252A719 | 0000 |
| 4 1/2" | Partially Threaded | Coarse | 1 3/4" | 2 3/4" | 1 1/4" | 15/32" | 75,000 | ASTM A193, ASTM A962 | 92655A654 | 00000 | 1 | 94252A719 | 0000 |
| 5" | Partially Threaded | Coarse | 1 3/4" | 3 1/4" | 1 1/4" | 15/32" | 75,000 | ASTM A193, ASTM A962 | 92655A655 | 00000 | 1 | 94252A719 | 0000 |
| 5 1/2" | Partially Threaded | Coarse | 1 3/4" | 3 3/4" | 1 1/4" | 15/32" | 75,000 | ASTM A193, ASTM A962 | 92655A656 | 00000 | 1 | 94252A719 | 0000 |
| 6" | Partially Threaded | Coarse | 1 3/4" | 4 1/4" | 1 1/4" | 15/32" | 75,000 | ASTM A193, ASTM A962 | 92655A657 | 00000 | 1 | 94252A719 | 0000 |
| 7" | Partially Threaded | Coarse | 2" | 5" | 1 1/4" | 15/32" | 75,000 | ASTM A193, ASTM A962 | 92655A658 | 00000 | 1 | 94252A719 | 0000 |
| 8" | Partially Threaded | Coarse | 2" | 6" | 1 1/4" | 15/32" | 75,000 | ASTM A193, ASTM A962 | 92655A659 | 00000 | 1 | 94252A719 | 0000 |
7/8"-9 | |||||||||||||
| 1" | Fully Threaded | Coarse | __ | __ | 1 7/16" | 35/64" | 75,000 | ASTM A193, ASTM A962 | 92655A663 | 00000 | 1 | 94252A722 | 0000 |
| 1 1/4" | Fully Threaded | Coarse | __ | __ | 1 7/16" | 35/64" | 75,000 | ASTM A193, ASTM A962 | 92655A664 | 00000 | 1 | 94252A722 | 0000 |
| 1 1/2" | Fully Threaded | Coarse | __ | __ | 1 7/16" | 35/64" | 75,000 | ASTM A193, ASTM A962 | 92655A665 | 00000 | 1 | 94252A722 | 0000 |