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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.
High-Pressure Stainless Steel Heavy Hex Head Screws
 |
Fully Threaded |
 |
Partially Threaded |
Resist corrosion and meet ASTM standards for use in high-pressure and high-temperature applications. Also known as pressure bolts, these screws are often used to secure pressure tanks, valves, and flanges. They're also good for cold temperatures. With a head that's about 10% wider than standard hex head screws, they handle heavier loads by distributing them over a larger area. The head also has six flat sides to keep wrenches and sockets from slipping and rounding off the drive.
Length is measured from under the head.
Highly Corrosion-Resistant ASTM Grade B8M 316 Stainless Steel—Stand up to rust and corrosion better than 18-8 stainless steel. These screws are often used near salt water, on ships, and in plants that handle harsh chemicals.
Grip Length—Screws with a grip length 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 exposed to sideways forces.
Head | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Lg. | Grip Lg. | Wd. | Ht. | Threading | Thread Spacing | Tensile Strength, psi | Specs. Met | Each | |||
Highly Corrosion-Resistant ASTM Grade B8M 316 Stainless Steel | |||||||||||
3/8"-16 | |||||||||||
| 1" | — | 9/16" | 15/64" | Fully Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A611 | 00000 | ||
| 1 1/4" | — | 9/16" | 15/64" | Fully Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A612 | 0000 | ||
| 1 3/4" | 3/4" | 9/16" | 15/64" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A613 | 0000 | ||
| 2" | 1" | 9/16" | 15/64" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A614 | 0000 | ||
| 2 1/4" | 1 1/4" | 9/16" | 15/64" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A615 | 0000 | ||
| 2 1/2" | 1 1/2" | 9/16" | 15/64" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A616 | 0000 | ||
| 2 3/4" | 1 3/4" | 9/16" | 15/64" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A617 | 0000 | ||
| 3" | 2" | 9/16" | 15/64" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A618 | 0000 | ||
| 4" | 3" | 9/16" | 15/64" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A619 | 00000 | ||
| 6" | 5" | 9/16" | 15/64" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A622 | 00000 | ||
1/2"-13 | |||||||||||
| 1" | — | 7/8" | 5/16" | Fully Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A200 | 0000 | ||
| 1 1/4" | — | 7/8" | 5/16" | Fully Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A206 | 0000 | ||
| 1 1/2" | 1/2" | 7/8" | 5/16" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A212 | 0000 | ||
| 1 3/4" | 3/4" | 7/8" | 5/16" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A218 | 0000 | ||
| 2" | 3/4" | 7/8" | 5/16" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A224 | 0000 | ||
| 2 1/4" | 1" | 7/8" | 5/16" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A230 | 0000 | ||
| 2 1/2" | 1 1/4" | 7/8" | 5/16" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A236 | 0000 | ||
| 2 3/4" | 1 1/2" | 7/8" | 5/16" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A242 | 0000 | ||
| 3" | 1 3/4" | 7/8" | 5/16" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A248 | 0000 | ||
| 3 1/2" | 2 1/4" | 7/8" | 5/16" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A254 | 0000 | ||
| 3 3/4" | 2 1/2" | 7/8" | 5/16" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A623 | 0000 | ||
| 4" | 2 3/4" | 7/8" | 5/16" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A260 | 0000 | ||
| 4 1/4" | 3" | 7/8" | 5/16" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A624 | 00000 | ||
| 4 1/2" | 3 1/4" | 7/8" | 5/16" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A102 | 00000 | ||
| 6" | 4 3/4" | 7/8" | 5/16" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A626 | 00000 | ||
| 7" | 5 1/2" | 7/8" | 5/16" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A627 | 00000 | ||
| 8" | 6 1/2" | 7/8" | 5/16" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A692 | 00000 | ||
5/8"-11 | |||||||||||
| 1 1/4" | — | 1 1/16" | 25/64" | Fully Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A629 | 0000 | ||
| 1 1/2" | — | 1 1/16" | 25/64" | Fully Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A631 | 0000 | ||
| 1 3/4" | — | 1 1/16" | 25/64" | Fully Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A693 | 0000 | ||
| 2" | 1/2" | 1 1/16" | 25/64" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A350 | 0000 | ||
| 2 1/4" | 3/4" | 1 1/16" | 25/64" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A633 | 0000 | ||
| 2 1/2" | 1" | 1 1/16" | 25/64" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A634 | 0000 | ||
| 2 3/4" | 1 1/4" | 1 1/16" | 25/64" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A635 | 00000 | ||
| 3" | 1 1/2" | 1 1/16" | 25/64" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A356 | 00000 | ||
| 3 1/4" | 1 3/4" | 1 1/16" | 25/64" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A636 | 00000 | ||
| 3 1/2" | 2" | 1 1/16" | 25/64" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A362 | 00000 | ||
| 3 3/4" | 2 1/4" | 1 1/16" | 25/64" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A637 | 00000 | ||
| 4" | 2 1/2" | 1 1/16" | 25/64" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A368 | 00000 | ||
| 4 1/2" | 3" | 1 1/16" | 25/64" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A638 | 00000 | ||
| 5" | 3 1/2" | 1 1/16" | 25/64" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A639 | 00000 | ||
| 5 1/2" | 4" | 1 1/16" | 25/64" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A641 | 00000 | ||
| 6" | 4 1/2" | 1 1/16" | 25/64" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A642 | 00000 | ||
3/4"-10 | |||||||||||
| 1 1/2" | — | 1 1/4" | 15/32" | Fully Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A643 | 00000 | ||
| 1 3/4" | — | 1 1/4" | 15/32" | Fully Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A644 | 00000 | ||
| 2" | — | 1 1/4" | 15/32" | Fully Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A645 | 00000 | ||
| 2 1/4" | 1/2" | 1 1/4" | 15/32" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A646 | 00000 | ||
| 2 1/2" | 3/4" | 1 1/4" | 15/32" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A421 | 00000 | ||
| 3" | 1 1/4" | 1 1/4" | 15/32" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A427 | 00000 | ||
| 3 1/2" | 1 3/4" | 1 1/4" | 15/32" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A433 | 00000 | ||
| 3 3/4" | 2" | 1 1/4" | 15/32" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A647 | 00000 | ||
| 4" | 2 1/4" | 1 1/4" | 15/32" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A439 | 00000 | ||
| 4 1/4" | 2 1/2" | 1 1/4" | 15/32" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A648 | 00000 | ||
| 4 3/4" | 3" | 1 1/4" | 15/32" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A649 | 00000 | ||
| 5 1/4" | 3 1/2" | 1 1/4" | 15/32" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A651 | 00000 | ||
| 5 1/2" | 3 3/4" | 1 1/4" | 15/32" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A652 | 00000 | ||
| 5 3/4" | 4" | 1 1/4" | 15/32" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A653 | 00000 | ||
| 6" | 4 1/4" | 1 1/4" | 15/32" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A654 | 00000 | ||
| 6 1/2" | 4 3/4" | 1 1/4" | 15/32" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A655 | 00000 | ||
| 6 3/4" | 5" | 1 1/4" | 15/32" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A657 | 00000 | ||
7/8"-9 | |||||||||||
| 2" | — | 1 7/16" | 35/64" | Fully Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A103 | 00000 | ||
| 2 1/2" | 1/2" | 1 7/16" | 35/64" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A659 | 00000 | ||
| 3" | 1" | 1 7/16" | 35/64" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A104 | 00000 | ||
| 3 1/2" | 1 1/2" | 1 7/16" | 35/64" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A664 | 00000 | ||
| 4" | 2" | 1 7/16" | 35/64" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A105 | 00000 | ||
| 4 1/2" | 2 1/2" | 1 7/16" | 35/64" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A668 | 00000 | ||
| 4 3/4" | 2 3/4" | 1 7/16" | 35/64" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A669 | 00000 | ||
| 5" | 3" | 1 7/16" | 35/64" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A671 | 00000 | ||
1"-8 | |||||||||||
| 2" | — | 1 5/8" | 39/64" | Fully Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A674 | 00000 | ||
| 3" | 1" | 1 5/8" | 39/64" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A678 | 00000 | ||
| 4" | 2" | 1 5/8" | 39/64" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A683 | 00000 | ||
| 4 1/4" | 2 1/4" | 1 5/8" | 39/64" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A684 | 00000 | ||
| 5" | 3" | 1 5/8" | 39/64" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A687 | 00000 | ||
| 5 1/2" | 3 1/2" | 1 5/8" | 39/64" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A688 | 00000 | ||
| 6" | 4" | 1 5/8" | 39/64" | Partially Threaded | Coarse | 75,000 | ASTM A193 ASTM A962 | 92790A689 | 00000 | ||
1 1/8"-8 | |||||||||||
| 2 1/2" | — | 1 13/16" | 11/16" | Fully Threaded | Fine | 75,000 | ASTM A193 ASTM A962 | 92790A107 | 000000 | ||
| 3" | — | 1 13/16" | 11/16" | Fully Threaded | Fine | 75,000 | ASTM A193 ASTM A962 | 92790A109 | 000000 | ||
| 3 1/2" | — | 1 13/16" | 11/16" | Fully Threaded | Fine | 75,000 | ASTM A193 ASTM A962 | 92790A108 | 000000 | ||
| 4" | 1 1/2" | 1 13/16" | 11/16" | Partially Threaded | Fine | 75,000 | ASTM A193 ASTM A962 | 92790A111 | 000000 | ||
| 6" | 3 1/2" | 1 13/16" | 11/16" | Partially Threaded | Fine | 75,000 | ASTM A193 ASTM A962 | 92790A112 | 000000 | ||
1 1/4"-8 | |||||||||||
| 3" | — | 2" | 25/32" | Fully Threaded | Fine | 75,000 | ASTM A193 ASTM A962 | 92790A115 | 00000 | ||
| 3 1/2" | — | 2" | 25/32" | Fully Threaded | Fine | 75,000 | ASTM A193 ASTM A962 | 92790A114 | 000000 | ||
| 4" | 1 1/4" | 2" | 25/32" | Partially Threaded | Fine | 75,000 | ASTM A193 ASTM A962 | 92790A116 | 00000 | ||
| 5" | 2 1/4" | 2" | 25/32" | Partially Threaded | Fine | 75,000 | ASTM A193 ASTM A962 | 92790A117 | 00000 | ||
| 6" | 3 1/4" | 2" | 25/32" | Partially Threaded | Fine | 75,000 | ASTM A193 ASTM A962 | 92790A113 | 000000 | ||
Stainless Steel Heavy Hex Head Screw Kits for Metal Pipe Flanges
 |  |
Shown Installed |
All the hardware you need to 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. 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 B8M—Also known as pressure bolts, these screws meet ASTM standards for use in high-pressure and high-temperature applications. They're also good for cold temperatures.
316 Stainless Steel—Superior to 18-8 stainless steel screws, these won't degrade when exposed to harsh weather, salt water, and most chemicals.
Screw | Nut | 316 Stainless 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 B8M for Class 125/150 Flanges | ||||||||||||||
| 1/2, 3/4 | 1/2"-13 | 2" | 7/8" | 11/32" | Partially Threaded | Coarse | 75,000 | 7/8" | 31/64" | 4 Heavy Hex Head Screws 4 Heavy Hex Nuts | 97755A111 | 000000 | ||
| 1, 1 1/4 | 1/2"-13 | 2 1/4" | 7/8" | 11/32" | Partially Threaded | Coarse | 75,000 | 7/8" | 31/64" | 4 Heavy Hex Head Screws 4 Heavy Hex Nuts | 97755A114 | 00000 | ||
| 1 1/2 | 1/2"-13 | 2 1/2" | 7/8" | 11/32" | Partially Threaded | Coarse | 75,000 | 7/8" | 31/64" | 4 Heavy Hex Head Screws 4 Heavy Hex Nuts | 97755A121 | 00000 | ||
| 2 | 5/8"-11 | 2 3/4" | 1 1/16" | 27/64" | Partially Threaded | Coarse | 75,000 | 1 1/16" | 39/64" | 4 Heavy Hex Head Screws 4 Heavy Hex Nuts | 97755A115 | 00000 | ||
| 2 1/2, 3 | 5/8"-11 | 3" | 1 1/16" | 27/64" | Partially Threaded | Coarse | 75,000 | 1 1/16" | 39/64" | 4 Heavy Hex Head Screws 4 Heavy Hex Nuts | 97755A112 | 00000 | ||
| 3 1/2, 4 | 5/8"-11 | 3" | 1 1/16" | 27/64" | Partially Threaded | Coarse | 75,000 | 1 1/16" | 39/64" | 8 Heavy Hex Head Screws 8 Heavy Hex Nuts | 97755A116 | 00000 | ||
| 5, 6 | 3/4"-10 | 3 1/4" | 1 1/4" | 1/2" | Partially Threaded | Coarse | 75,000 | 1 1/4" | 47/64" | 8 Heavy Hex Head Screws 8 Heavy Hex Nuts | 97755A117 | 000000 | ||
| 8 | 3/4"-10 | 3 1/2" | 1 1/4" | 1/2" | Partially Threaded | Coarse | 75,000 | 1 1/4" | 47/64" | 8 Heavy Hex Head Screws 8 Heavy Hex Nuts | 97755A118 | 00000 | ||
ASTM Grade B8M for Class 250/300 Flanges | ||||||||||||||
| 2 | 5/8"-11 | 3" | 1 1/16" | 27/64" | Partially Threaded | Coarse | 75,000 | 1 1/16" | 39/64" | 8 Heavy Hex Head Screws 8 Heavy Hex Nuts | 97755A113 | 00000 | ||
| 3 | 3/4"-10 | 3 1/2" | 1 1/4" | 1/2" | Partially Threaded | Coarse | 75,000 | 1 1/4" | 47/64" | 8 Heavy Hex Head Screws 8 Heavy Hex Nuts | 97755A119 | 00000 | ||
