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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.
Steel Heavy Hex Head Screw Kits for Metal Pipe Flanges
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Shown Installed |
All the hardware you need to join steel or cast iron pipe flanges. These kits come with screws and nuts in the right size and number to match your flange's bolt holes. With screw heads and nuts that are about 10% wider than standard, these kits handle heavier loads by distributing them over a larger area. The head also gives you six, flat contact points, so wrenches and sockets won't slip and round off the drive.
Screw length is measured from under the head. For a tight seal, you’ll also need a gasket between the flanges.
ASTM Grade L7—In addition to handling high heat, these screws stay strong in freezing temperatures without cracking. They're frequently used in industrial refrigeration systems, cold-storage facilities, and pipelines for oil and gas.
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Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.
Screw | Nut | Steel Screws and Nuts | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
For Pipe Size | Thread Size | Lg. | Head Wd. | Head Ht. | Threading | Thread Spacing | Tensile Strength, psi | Wd. | Ht. | Includes | Each | |||
ASTM Grade L7 for Class 125/150 Flanges | ||||||||||||||
| 1, 1 1/4 | 1/2"-13 | 2 1/4" | 7/8" | 11/32" | Partially Threaded | Coarse | 125,000 | 7/8" | 31/64" | 4 Heavy Hex Head Screws 4 Heavy Hex Nuts | 97771A128 | 000000 | ||
| 1 1/2 | 1/2"-13 | 2 1/2" | 7/8" | 11/32" | Partially Threaded | Coarse | 125,000 | 7/8" | 31/64" | 4 Heavy Hex Head Screws 4 Heavy Hex Nuts | 97771A129 | 00000 | ||
| 2 | 5/8"-11 | 2 3/4" | 1 1/16" | 27/64" | Partially Threaded | Coarse | 125,000 | 1 1/16" | 39/64" | 4 Heavy Hex Head Screws 4 Heavy Hex Nuts | 97771A131 | 00000 | ||
| 2 1/2, 3 | 5/8"-11 | 3" | 1 1/16" | 27/64" | Partially Threaded | Coarse | 125,000 | 1 1/16" | 39/64" | 4 Heavy Hex Head Screws 4 Heavy Hex Nuts | 97771A132 | 00000 | ||
| 3 1/2, 4 | 5/8"-11 | 3" | 1 1/16" | 27/64" | Partially Threaded | Coarse | 125,000 | 1 1/16" | 39/64" | 8 Heavy Hex Head Screws 8 Heavy Hex Nuts | 97771A133 | 00000 | ||
| 5, 6 | 3/4"-10 | 3 1/4" | 1 1/4" | 1/2" | Partially Threaded | Coarse | 125,000 | 1 1/4" | 47/64" | 8 Heavy Hex Head Screws 8 Heavy Hex Nuts | 97771A134 | 00000 | ||
