Filter by
System of Measurement
Length
Fastener Strength Grade/Class
Material
Grip Length
Threading
Fastener Head Type
Drive Style
Thread Spacing
Thread Direction
Thread Type
Tensile Strength
Hardness
U.S.–Mexico–Canada Agreement (USMCA) Qualifying
Export Control Classification Number (ECCN)
REACH
RoHS
DFARS Specialty Metals
About Nuts, Materials, and Finishes
More
About Hex Head Screws and Bolts
More
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 | 000000000 | 00000 | 10 | 000000000 | 00000 |
| 1 1/4" | Fully Threaded | Coarse | __ | __ | 9/16" | 15/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 0000 | 10 | 000000000 | 0000 |
| 1 1/2" | Partially Threaded | Coarse | 1" | 1/2" | 9/16" | 15/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 0000 | 10 | 000000000 | 0000 |
| 1 3/4" | Partially Threaded | Coarse | 1" | 3/4" | 9/16" | 15/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 0000 | 10 | 000000000 | 0000 |
| 2" | Partially Threaded | Coarse | 1" | 1" | 9/16" | 15/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 0000 | 10 | 000000000 | 0000 |
| 2 1/4" | Partially Threaded | Coarse | 1" | 1 1/4" | 9/16" | 15/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 0000 | 10 | 000000000 | 0000 |
| 2 1/2" | Partially Threaded | Coarse | 1" | 1 1/2" | 9/16" | 15/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 0000 | 10 | 000000000 | 0000 |
| 2 3/4" | Partially Threaded | Coarse | 1" | 1 3/4" | 9/16" | 15/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 0000 | 10 | 000000000 | 0000 |
| 3" | Partially Threaded | Coarse | 1" | 2" | 9/16" | 15/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 0000 | 10 | 000000000 | 0000 |
| 4" | Partially Threaded | Coarse | 1" | 3" | 9/16" | 15/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 10 | 000000000 | 0000 |
| 4 1/2" | Partially Threaded | Coarse | 1" | 3 1/2" | 9/16" | 15/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 10 | 000000000 | 0000 |
| 5" | Partially Threaded | Coarse | 1" | 4" | 9/16" | 15/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 10 | 000000000 | 0000 |
| 6" | Partially Threaded | Coarse | 1" | 5" | 9/16" | 15/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 10 | 000000000 | 0000 |
| 7" | Partially Threaded | Coarse | 1 1/4" | 5 3/4" | 9/16" | 15/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 10 | 000000000 | 0000 |
| 8" | Partially Threaded | Coarse | 1 1/4" | 6 3/4" | 9/16" | 15/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 10 | 000000000 | 0000 |
1/2"-13 | |||||||||||||
| 1" | Fully Threaded | Coarse | __ | __ | 7/8" | 11/32" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 0000 | 10 | 000000000 | 00000 |
| 1 1/4" | Fully Threaded | Coarse | __ | __ | 7/8" | 5/16" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 0000 | 10 | 000000000 | 00000 |
| 1 1/2" | Fully Threaded | Coarse | __ | __ | 7/8" | 5/16" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 0000 | 10 | 000000000 | 00000 |
| 1 3/4" | Partially Threaded | Coarse | 1 1/4" | 1/2" | 7/8" | 11/32" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 0000 | 10 | 000000000 | 00000 |
| 2" | Partially Threaded | Coarse | 1 1/4" | 3/4" | 7/8" | 5/16" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 0000 | 10 | 000000000 | 00000 |
| 2 1/4" | Partially Threaded | Coarse | 1 1/4" | 1" | 7/8" | 5/16" | 75,000 | ASTM A193, ASTM A962 | 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, ASTM A962 | 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, ASTM A962 | 000000000 | 0000 | 10 | 000000000 | 00000 |
| 3" | Partially Threaded | Coarse | 1 1/4" | 1 3/4" | 7/8" | 5/16" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 0000 | 10 | 000000000 | 00000 |
| 3 1/4" | Partially Threaded | Coarse | 1 1/4" | 2" | 7/8" | 5/16" | 75,000 | ASTM A193, ASTM A962 | 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, ASTM A962 | 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, ASTM A962 | 000000000 | 0000 | 10 | 000000000 | 00000 |
| 4" | Partially Threaded | Coarse | 1 1/4" | 2 3/4" | 7/8" | 5/16" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 0000 | 10 | 000000000 | 00000 |
| 4 1/4" | Partially Threaded | Coarse | 1 1/4" | 3" | 7/8" | 5/16" | 75,000 | ASTM A193, ASTM A962 | 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, ASTM A962 | 000000000 | 0000 | 10 | 000000000 | 00000 |
| 5" | Partially Threaded | Coarse | 1 1/4" | 3 3/4" | 7/8" | 5/16" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 10 | 000000000 | 00000 |
| 5 1/2" | Partially Threaded | Coarse | 1 1/4" | 4 1/4" | 7/8" | 11/32" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 10 | 000000000 | 00000 |
| 6" | Partially Threaded | Coarse | 1 1/4" | 4 3/4" | 7/8" | 5/16" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 10 | 000000000 | 00000 |
| 6 1/2" | Partially Threaded | Coarse | 1 1/2" | 5" | 7/8" | 11/32" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 10 | 000000000 | 00000 |
| 7" | Partially Threaded | Coarse | 1 1/2" | 5 1/2" | 7/8" | 5/16" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 10 | 000000000 | 00000 |
| 8" | Partially Threaded | Coarse | 1 1/2" | 6 1/2" | 7/8" | 5/16" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 10 | 000000000 | 00000 |
| 9" | Partially Threaded | Coarse | 1 1/2" | 7 1/2" | 7/8" | 5/16" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 10 | 000000000 | 00000 |
5/8"-11 | |||||||||||||
| 1" | Fully Threaded | Coarse | __ | __ | 1 1/16" | 25/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 5 | 000000000 | 00000 |
| 1 1/4" | Fully Threaded | Coarse | __ | __ | 1 1/16" | 25/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 0000 | 5 | 000000000 | 00000 |
| 1 1/2" | Fully Threaded | Coarse | __ | __ | 1 1/16" | 25/64" | 75,000 | ASTM A193, ASTM A962 | 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, ASTM A962 | 000000000 | 0000 | 5 | 000000000 | 00000 |
| 2" | Partially Threaded | Coarse | 1 1/2" | 1/2" | 1 1/16" | 25/64" | 75,000 | ASTM A193, ASTM A962 | 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, ASTM A962 | 000000000 | 0000 | 5 | 000000000 | 00000 |
| 2 1/2" | Partially Threaded | Coarse | 1 1/2" | 1" | 1 1/16" | 25/64" | 75,000 | ASTM A193, ASTM A962 | 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, ASTM A962 | 000000000 | 0000 | 5 | 000000000 | 00000 |
| 3" | Partially Threaded | Coarse | 1 1/2" | 1 1/2" | 1 1/16" | 25/64" | 75,000 | ASTM A193, ASTM A962 | 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, ASTM A962 | 000000000 | 0000 | 5 | 000000000 | 00000 |
| 3 1/2" | Partially Threaded | Coarse | 1 1/2" | 2" | 1 1/16" | 25/64" | 75,000 | ASTM A193, ASTM A962 | 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, ASTM A962 | 000000000 | 00000 | 5 | 000000000 | 00000 |
| 4" | Partially Threaded | Coarse | 1 1/2" | 2 1/2" | 1 1/16" | 25/64" | 75,000 | ASTM A193, ASTM A962 | 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, ASTM A962 | 000000000 | 00000 | 5 | 000000000 | 00000 |
| 4 1/2" | Partially Threaded | Coarse | 1 1/2" | 3" | 1 1/16" | 25/64" | 75,000 | ASTM A193, ASTM A962 | 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, ASTM A962 | 000000000 | 00000 | 5 | 000000000 | 00000 |
| 5" | Partially Threaded | Coarse | 1 1/2" | 3 1/2" | 1 1/16" | 25/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 5 | 000000000 | 00000 |
| 5 1/2" | Partially Threaded | Coarse | 1 1/2" | 4" | 1 1/16" | 25/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 5 | 000000000 | 00000 |
| 6" | Partially Threaded | Coarse | 1 1/2" | 4 1/2" | 1 1/16" | 25/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 5 | 000000000 | 00000 |
| 7" | Partially Threaded | Coarse | 1 3/4" | 5 1/4" | 1 1/16" | 25/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 5 | 000000000 | 00000 |
| 8" | Partially Threaded | Coarse | 1 3/4" | 6 1/4" | 1 1/16" | 25/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 5 | 000000000 | 00000 |
3/4"-10 | |||||||||||||
| 1" | Fully Threaded | Coarse | __ | __ | 1 1/4" | 15/32" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 1 1/4" | Fully Threaded | Coarse | __ | __ | 1 1/4" | 15/32" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 1 1/2" | Fully Threaded | Coarse | __ | __ | 1 1/4" | 15/32" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 0000 | 1 | 000000000 | 0000 |
| 1 3/4" | Fully Threaded | Coarse | __ | __ | 1 1/4" | 15/32" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 0000 | 1 | 000000000 | 0000 |
| 2" | Fully Threaded | Coarse | __ | __ | 1 1/4" | 15/32" | 75,000 | ASTM A193, ASTM A962 | 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, ASTM A962 | 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, ASTM A962 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 2 3/4" | Partially Threaded | Coarse | 1 3/4" | 1" | 1 1/4" | 15/32" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 3" | Partially Threaded | Coarse | 1 3/4" | 1 1/4" | 1 1/4" | 15/32" | 75,000 | ASTM A193, ASTM A962 | 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, ASTM A962 | 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, ASTM A962 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 3 3/4" | Partially Threaded | Coarse | 1 3/4" | 2" | 1 1/4" | 15/32" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 4" | Partially Threaded | Coarse | 1 3/4" | 2 1/4" | 1 1/4" | 15/32" | 75,000 | ASTM A193, ASTM A962 | 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, ASTM A962 | 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, ASTM A962 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 5" | Partially Threaded | Coarse | 1 3/4" | 3 1/4" | 1 1/4" | 15/32" | 75,000 | ASTM A193, ASTM A962 | 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, ASTM A962 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 6" | Partially Threaded | Coarse | 1 3/4" | 4 1/4" | 1 1/4" | 15/32" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 7" | Partially Threaded | Coarse | 2" | 5" | 1 1/4" | 15/32" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 8" | Partially Threaded | Coarse | 2" | 6" | 1 1/4" | 15/32" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 1 | 000000000 | 0000 |
7/8"-9 | |||||||||||||
| 1" | Fully Threaded | Coarse | __ | __ | 1 7/16" | 35/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 1 1/4" | Fully Threaded | Coarse | __ | __ | 1 7/16" | 35/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 1 1/2" | Fully Threaded | Coarse | __ | __ | 1 7/16" | 35/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 1 | 000000000 | 0000 |