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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.
Stainless Steel Hex Head Screw Kits for Metal Pipe Flanges
 |  |
Shown Installed |
Join aluminum or stainless steel pipe flanges. These kits come with corrosion-resistant screws and nuts in the right size and number to match your flange's bolt holes. The screws have a head with six flat sides to keep wrenches and sockets from slipping and rounding off the drive.
Screw length is measured from under the head. For a tight seal, you’ll also need a gasket between the flanges.
316 Stainless Steel—Superior to 18-8 stainless steel screws, these won't degrade when exposed to harsh weather, salt water, and most chemicals.
PTFE-Coated 316 Stainless Steel—A slippery coating prevents these nuts from binding or sticking during installation. They resist rust in wet and outdoor environments and can handle occasional exposure to mild acids and chemicals without corroding.
Screw | Nut | 316 Stainless Steel Screws and Blue PTFE-Coated 316 Stainless Steel Nuts | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
For Pipe Size | Thread Size | Lg. | Head Wd. | Head Ht. | Threading | Thread Spacing | Tensile Strength, psi | Wd. | Ht. | Includes | Each | |||
For Class 125/150 Flanges | ||||||||||||||
| 1/2, 3/4 | 1/2"-13 | 2" | 3/4" | 11/32" | Partially Threaded | Coarse | 80,000 | 3/4" | 7/16" | 4 Hex Head Screws 4 Hex Nuts | 94368A227 | 000000 | ||
| 1, 1 1/4 | 1/2"-13 | 2 1/4" | 3/4" | 11/32" | Partially Threaded | Coarse | 80,000 | 3/4" | 7/16" | 4 Hex Head Screws 4 Hex Nuts | 94368A228 | 00000 | ||
| 1 1/2 | 1/2"-13 | 2 1/2" | 3/4" | 11/32" | Partially Threaded | Coarse | 80,000 | 3/4" | 7/16" | 4 Hex Head Screws 4 Hex Nuts | 94368A212 | 00000 | ||
| 2 | 5/8"-11 | 2 3/4" | 15/16" | 27/64" | Partially Threaded | Coarse | 80,000 | 15/16" | 35/64" | 4 Hex Head Screws 4 Hex Nuts | 94368A213 | 00000 | ||
| 2 1/2, 3 | 5/8"-11 | 3" | 15/16" | 27/64" | Partially Threaded | Coarse | 80,000 | 15/16" | 35/64" | 4 Hex Head Screws 4 Hex Nuts | 94368A138 | 00000 | ||
| 4 | 5/8"-11 | 3" | 15/16" | 27/64" | Partially Threaded | Coarse | 80,000 | 15/16" | 35/64" | 8 Hex Head Screws 8 Hex Nuts | 94368A139 | 00000 | ||
| 6 | 3/4"-10 | 3 1/4" | 1 1/8" | 1/2" | Partially Threaded | Coarse | 80,000 | 1 1/8" | 41/64" | 8 Hex Head Screws 8 Hex Nuts | 94368A141 | 00000 | ||
| 8 | 3/4"-10 | 3 1/2" | 1 1/8" | 1/2" | Partially Threaded | Coarse | 80,000 | 1 1/8" | 41/64" | 8 Hex Head Screws 8 Hex Nuts | 94368A142 | 00000 | ||
| 10, 12 | 7/8"-9 | 4" | 1 5/16" | 37/64" | Partially Threaded | Coarse | 80,000 | 1 5/16" | 3/4" | 12 Hex Head Screws 12 Hex Nuts | 94368A144 | 000000 | ||
For Class 300 Flanges | ||||||||||||||
| 1/2 | 1/2"-13 | 2 1/4" | 3/4" | 11/32" | Partially Threaded | Coarse | 80,000 | 3/4" | 7/16" | 4 Hex Head Screws 4 Hex Nuts | 94368A222 | 00000 | ||
| 3/4, 1 | 5/8"-11 | 2 1/2" | 15/16" | 27/64" | Partially Threaded | Coarse | 80,000 | 15/16" | 35/64" | 4 Hex Head Screws 4 Hex Nuts | 94368A219 | 00000 | ||
| 1 1/4 | 5/8"-11 | 2 3/4" | 15/16" | 27/64" | Partially Threaded | Coarse | 80,000 | 15/16" | 35/64" | 4 Hex Head Screws 4 Hex Nuts | 94368A218 | 00000 | ||
| 1 1/2 | 3/4"-10 | 3" | 1 1/8" | 1/2" | Partially Threaded | Coarse | 80,000 | 1 1/8" | 41/64" | 4 Hex Head Screws 4 Hex Nuts | 94368A217 | 00000 | ||
| 2 | 5/8"-11 | 3" | 15/16" | 27/64" | Partially Threaded | Coarse | 80,000 | 15/16" | 35/64" | 8 Hex Head Screws 8 Hex Nuts | 94368A216 | 00000 | ||
| 3 1/2, 4 | 3/4"-10 | 3 3/4" | 1 1/8" | 1/2" | Partially Threaded | Coarse | 80,000 | 1 1/8" | 41/64" | 8 Hex Head Screws 8 Hex Nuts | 94368A221 | 000000 | ||
