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Stainless Steel Heavy Hex Screw and Nut Kits for Pipe Flanges
Shown Installed
Connect standard-size stainless steel or aluminum pipe flanges with these kits—they come with screws and nuts in the right size and number to match the bolt holes. The screw heads and nuts are 10% wider than standard hex fasteners, so they spread force over a larger area, and you can tighten with more torque. Made from 316 stainless steel, the fasteners in these kits have excellent resistance to chemicals and salt water. They may also be mildly magnetic. For a complete connection, you’ll also need a gasket. Screw length is measured from under the head.
All screws and nuts meet ASTM A193 or A194 standards for high-pressure and high-temperature applications. They also meet ASME B18.2.1 standards for dimensions.
Screw | Nut | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| For Pipe Size  | Lg. | Min. Thread Lg. | Head Wd. | Head Ht. | Tensile Strength, psi | Wd. | Ht. | No. of Screws Included | No. of Nuts Included | Each | |
ASTM Grade B8M 316 Stainless Steel for Class 125/150 Pipe Flanges | |||||||||||
1/2"-13 | |||||||||||
| 1/2, 3/4 | 2" | 1 1/4" | 7/8" | 11/32" | 75,000 | 7/8" | 31/64" | 4 | 4 | 000000000 | 000000 |
| 1, 1 1/4 | 2 1/4" | 1 1/4" | 7/8" | 11/32" | 75,000 | 7/8" | 31/64" | 4 | 4 | 000000000 | 00000 |
| 1 1/2 | 2 1/2" | 1 1/4" | 7/8" | 11/32" | 75,000 | 7/8" | 31/64" | 4 | 4 | 000000000 | 00000 |
5/8"-11 | |||||||||||
| 2 | 2 3/4" | 1 1/2" | 1 1/16" | 27/64" | 75,000 | 1 1/16" | 39/64" | 4 | 4 | 000000000 | 00000 |
| 2 1/2, 3 | 3" | 1 1/2" | 1 1/16" | 27/64" | 75,000 | 1 1/16" | 39/64" | 4 | 4 | 000000000 | 00000 |
| 3 1/2, 4 | 3" | 1 1/2" | 1 1/16" | 27/64" | 75,000 | 1 1/16" | 39/64" | 8 | 8 | 000000000 | 00000 |
3/4"-10 | |||||||||||
| 5, 6 | 3 1/4" | 1 3/4" | 1 1/4" | 1/2" | 75,000 | 1 1/4" | 47/64" | 8 | 8 | 000000000 | 000000 |
| 8 | 3 1/2" | 1 3/4" | 1 1/4" | 1/2" | 75,000 | 1 1/4" | 47/64" | 8 | 8 | 000000000 | 00000 |
ASTM Grade B8M 316 Stainless Steel for Class 250/300 Pipe Flanges | |||||||||||
5/8"-11 | |||||||||||
| 2 | 3" | 1 1/2" | 1 1/16" | 27/64" | 75,000 | 1 1/16" | 39/64" | 8 | 8 | 000000000 | 00000 |
3/4"-10 | |||||||||||
| 3 | 3 1/2" | 1 3/4" | 1 1/4" | 1/2" | 75,000 | 1 1/4" | 47/64" | 8 | 8 | 000000000 | 00000 |
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. They have excellent resistance to chemicals and salt water, and 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 Grade 8M nuts.
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.
Coarse threads are the industry standard; choose these screws if you don’t know the threads per inch. Fine threads are closely spaced to prevent loosening from vibration.
Screws | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Head | 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, ASTM A962 | 000000000 | 00000 | 5 | 000000000 | 00000 |
| 1 1/4" | Fully Threaded | Coarse | __ | __ | 9/16" | 15/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 0000 | 5 | 000000000 | 0000 |
| 1 3/4" | Partially Threaded | Coarse | 1" | 3/4" | 9/16" | 15/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 0000 | 5 | 000000000 | 0000 |
| 2" | Partially Threaded | Coarse | 1" | 1" | 9/16" | 15/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 0000 | 5 | 000000000 | 0000 |
| 2 1/4" | Partially Threaded | Coarse | 1" | 1 1/4" | 9/16" | 15/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 0000 | 5 | 000000000 | 0000 |
| 2 1/2" | Partially Threaded | Coarse | 1" | 1 1/2" | 9/16" | 15/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 0000 | 5 | 000000000 | 0000 |
| 2 3/4" | Partially Threaded | Coarse | 1" | 1 3/4" | 9/16" | 15/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 0000 | 5 | 000000000 | 0000 |
| 3" | Partially Threaded | Coarse | 1" | 2" | 9/16" | 15/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 0000 | 5 | 000000000 | 0000 |
| 4" | Partially Threaded | Coarse | 1" | 3" | 9/16" | 15/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 5 | 000000000 | 0000 |
| 6" | Partially Threaded | Coarse | 1" | 5" | 9/16" | 15/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 5 | 000000000 | 0000 |
1/2"-13 | |||||||||||||
| 1" | Fully Threaded | Coarse | __ | __ | 7/8" | 5/16" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 0000 | 5 | 000000000 | 0000 |
| 1 1/4" | Fully Threaded | Coarse | __ | __ | 7/8" | 5/16" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 0000 | 5 | 000000000 | 0000 |
| 1 1/2" | Partially Threaded | Coarse | 1" | 1/2" | 7/8" | 5/16" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 0000 | 5 | 000000000 | 0000 |
| 1 3/4" | Partially Threaded | Coarse | 1" | 3/4" | 7/8" | 5/16" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 0000 | 5 | 000000000 | 0000 |
| 2" | Partially Threaded | Coarse | 1 1/4" | 3/4" | 7/8" | 5/16" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 0000 | 5 | 000000000 | 0000 |
| 2 1/4" | Partially Threaded | Coarse | 1 1/4" | 1" | 7/8" | 5/16" | 75,000 | ASTM A193, ASTM A962 | 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, ASTM A962 | 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, ASTM A962 | 000000000 | 0000 | 5 | 000000000 | 0000 |
| 3" | Partially Threaded | Coarse | 1 1/4" | 1 3/4" | 7/8" | 5/16" | 75,000 | ASTM A193, ASTM A962 | 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, ASTM A962 | 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, ASTM A962 | 000000000 | 0000 | 5 | 000000000 | 0000 |
| 4" | Partially Threaded | Coarse | 1 1/4" | 2 3/4" | 7/8" | 5/16" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 0000 | 5 | 000000000 | 0000 |
| 4 1/4" | Partially Threaded | Coarse | 1 1/4" | 3" | 7/8" | 5/16" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 5 | 000000000 | 0000 |
| 4 1/2" | Partially Threaded | Coarse | 1 1/4" | 3 1/4" | 7/8" | 5/16" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 5 | 000000000 | 0000 |
| 6" | Partially Threaded | Coarse | 1 1/4" | 4 3/4" | 7/8" | 5/16" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 5 | 000000000 | 0000 |
| 7" | Partially Threaded | Coarse | 1 1/2" | 5 1/2" | 7/8" | 5/16" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 5 | 000000000 | 0000 |
| 8" | Partially Threaded | Coarse | 1 1/2" | 6 1/2" | 7/8" | 5/16" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 5 | 000000000 | 0000 |
5/8"-11 | |||||||||||||
| 1 1/4" | Fully Threaded | Coarse | __ | __ | 1 1/16" | 25/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 0000 | 1 | 000000000 | 0000 |
| 1 1/2" | Fully Threaded | Coarse | __ | __ | 1 1/16" | 25/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 0000 | 1 | 000000000 | 0000 |
| 1 3/4" | Fully Threaded | Coarse | __ | __ | 1 1/16" | 25/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 0000 | 1 | 000000000 | 0000 |
| 2" | Partially Threaded | Coarse | 1 1/2" | 1/2" | 1 1/16" | 25/64" | 75,000 | ASTM A193, ASTM A962 | 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, ASTM A962 | 000000000 | 0000 | 1 | 000000000 | 0000 |
| 2 1/2" | Partially Threaded | Coarse | 1 1/2" | 1" | 1 1/16" | 25/64" | 75,000 | ASTM A193, ASTM A962 | 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, ASTM A962 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 3" | Partially Threaded | Coarse | 1 1/2" | 1 1/2" | 1 1/16" | 25/64" | 75,000 | ASTM A193, ASTM A962 | 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, ASTM A962 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 3 1/2" | Partially Threaded | Coarse | 1 1/2" | 2" | 1 1/16" | 25/64" | 75,000 | ASTM A193, ASTM A962 | 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, ASTM A962 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 4" | Partially Threaded | Coarse | 1 1/2" | 2 1/2" | 1 1/16" | 25/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 4 1/2" | Partially Threaded | Coarse | 1 1/2" | 3" | 1 1/16" | 25/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 5" | Partially Threaded | Coarse | 1 1/2" | 3 1/2" | 1 1/16" | 25/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 5 1/2" | Partially Threaded | Coarse | 1 1/2" | 4" | 1 1/16" | 25/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 6" | Partially Threaded | Coarse | 1 1/2" | 4 1/2" | 1 1/16" | 25/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 1 | 000000000 | 0000 |
3/4"-10 | |||||||||||||
| 1 1/2" | Fully Threaded | Coarse | __ | __ | 1 1/4" | 15/32" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 1 3/4" | Fully Threaded | Coarse | __ | __ | 1 1/4" | 15/32" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 2" | Fully Threaded | Coarse | __ | __ | 1 1/4" | 15/32" | 75,000 | ASTM A193, ASTM A962 | 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, ASTM A962 | 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, 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 1/2" | 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 3/4" | Partially Threaded | Coarse | 1 3/4" | 3" | 1 1/4" | 15/32" | 75,000 | ASTM A193, ASTM A962 | 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, 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 |
| 5 3/4" | Partially Threaded | Coarse | 1 3/4" | 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 |
| 6 1/2" | Partially Threaded | Coarse | 1 3/4" | 4 3/4" | 1 1/4" | 15/32" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 6 3/4" | Partially Threaded | Coarse | 1 3/4" | 5" | 1 1/4" | 15/32" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 1 | 000000000 | 0000 |
7/8"-9 | |||||||||||||
| 2" | Fully Threaded | Coarse | __ | __ | 1 7/16" | 35/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 2 1/2" | Partially Threaded | Coarse | 2" | 1/2" | 1 7/16" | 35/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 3" | Partially Threaded | Coarse | 2" | 1" | 1 7/16" | 35/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 3 1/2" | Partially Threaded | Coarse | 2" | 1 1/2" | 1 7/16" | 35/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 4" | Partially Threaded | Coarse | 2" | 2" | 1 7/16" | 35/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 4 1/2" | Partially Threaded | Coarse | 2" | 2 1/2" | 1 7/16" | 35/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 4 3/4" | Partially Threaded | Coarse | 2" | 2 3/4" | 1 7/16" | 35/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 5" | Partially Threaded | Coarse | 2" | 3" | 1 7/16" | 35/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 1 | 000000000 | 0000 |
1"-8 | |||||||||||||
| 2" | Fully Threaded | Coarse | __ | __ | 1 5/8" | 39/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 3" | Partially Threaded | Coarse | 2" | 1" | 1 5/8" | 39/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 4" | Partially Threaded | Coarse | 2" | 2" | 1 5/8" | 39/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 4 1/4" | Partially Threaded | Coarse | 2" | 2 1/4" | 1 5/8" | 39/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 5" | Partially Threaded | Coarse | 2" | 3" | 1 5/8" | 39/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 5 1/2" | Partially Threaded | Coarse | 2" | 3 1/2" | 1 5/8" | 39/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 6" | Partially Threaded | Coarse | 2" | 4" | 1 5/8" | 39/64" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 1 | 000000000 | 0000 |
1 1/8"-8 | |||||||||||||
| 2 1/2" | Fully Threaded | Fine | __ | __ | 1 13/16" | 11/16" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 000000 | 1 | 000000000 | 0000 |
| 3" | Fully Threaded | Fine | __ | __ | 1 13/16" | 11/16" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 000000 | 1 | 000000000 | 0000 |
| 3 1/2" | Fully Threaded | Fine | __ | __ | 1 13/16" | 11/16" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 000000 | 1 | 000000000 | 0000 |
| 4" | Partially Threaded | Fine | 2 1/2" | 1 1/2" | 1 13/16" | 11/16" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 000000 | 1 | 000000000 | 0000 |
| 6" | Partially Threaded | Fine | 2 1/2" | 3 1/2" | 1 13/16" | 11/16" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 000000 | 1 | 000000000 | 0000 |
1 1/4"-8 | |||||||||||||
| 3" | Fully Threaded | Fine | __ | __ | 2" | 25/32" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 3 1/2" | Fully Threaded | Fine | __ | __ | 2" | 25/32" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 000000 | 1 | 000000000 | 0000 |
| 4" | Partially Threaded | Fine | 2 3/4" | 1 1/4" | 2" | 25/32" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 5" | Partially Threaded | Fine | 2 3/4" | 2 1/4" | 2" | 25/32" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 00000 | 1 | 000000000 | 0000 |
| 6" | Partially Threaded | Fine | 2 3/4" | 3 1/4" | 2" | 25/32" | 75,000 | ASTM A193, ASTM A962 | 000000000 | 000000 | 1 | 000000000 | 0000 |