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About Hex Head Screws and Bolts
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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 |