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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 Steel Heavy Hex Head Screws
 |
Fully Threaded |
 |
Partially Threaded |
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. 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.
High-Strength Fastener—Commonly used to fasten components in valves, pumps, motors, and other high-stress applications. These screws have a tensile strength of 125,000 to 160,000 psi.
ASTM Grade B7—A reliable option for high-temperature machinery, such as boilers, steam turbines, and oil well equipment.
Steel—Unfinished steel screws are best for dry environments, since moisture will cause them to rust. They require little surface prep before applying a finish, so you can apply your own paint or coating.
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 | |||
High-Strength ASTM Grade B7 Steel | |||||||||||
1 1/8"-8 | |||||||||||
| 2 1/2" | — | 1 13/16" | 11/16" | Fully Threaded | Fine | 125,000 | ASME B18.2.1 ASTM A193 ASTM A962 | 94705A797 | 000000 | ||
| 2 3/4" | — | 1 13/16" | 11/16" | Fully Threaded | Fine | 125,000 | ASME B18.2.1 ASTM A193 ASTM A962 | 94705A798 | 00000 | ||
| 3" | — | 1 13/16" | 11/16" | Fully Threaded | Fine | 125,000 | ASME B18.2.1 ASTM A193 ASTM A962 | 94705A799 | 00000 | ||
| 3 1/4" | — | 1 13/16" | 11/16" | Fully Threaded | Fine | 125,000 | ASME B18.2.1 ASTM A193 ASTM A962 | 94705A811 | 00000 | ||
| 3 1/2" | — | 1 13/16" | 11/16" | Fully Threaded | Fine | 125,000 | ASME B18.2.1 ASTM A193 ASTM A962 | 94705A812 | 00000 | ||
| 4" | 1 1/2" | 1 13/16" | 11/16" | Partially Threaded | Fine | 125,000 | ASME B18.2.1 ASTM A193 ASTM A962 | 94705A814 | 00000 | ||
| 4 1/4" | 1 3/4" | 1 13/16" | 11/16" | Partially Threaded | Fine | 125,000 | ASME B18.2.1 ASTM A193 ASTM A962 | 94705A815 | 00000 | ||
| 4 1/2" | 2" | 1 13/16" | 11/16" | Partially Threaded | Fine | 125,000 | ASME B18.2.1 ASTM A193 ASTM A962 | 94705A816 | 00000 | ||
| 4 3/4" | 2 1/4" | 1 13/16" | 11/16" | Partially Threaded | Fine | 125,000 | ASME B18.2.1 ASTM A193 ASTM A962 | 94705A817 | 00000 | ||
| 5" | 2 1/2" | 1 13/16" | 11/16" | Partially Threaded | Fine | 125,000 | ASME B18.2.1 ASTM A193 ASTM A962 | 94705A818 | 00000 | ||
| 5 1/2" | 3" | 1 13/16" | 11/16" | Partially Threaded | Fine | 125,000 | ASME B18.2.1 ASTM A193 ASTM A962 | 94705A821 | 00000 | ||
| 6" | 3 1/2" | 1 13/16" | 11/16" | Partially Threaded | Fine | 125,000 | ASME B18.2.1 ASTM A193 ASTM A962 | 94705A823 | 00000 | ||
| 6 1/2" | 3 3/4" | 1 13/16" | 11/16" | Partially Threaded | Fine | 125,000 | ASME B18.2.1 ASTM A193 ASTM A962 | 94705A825 | 00000 | ||
| 7" | 4 1/4" | 1 13/16" | 11/16" | Partially Threaded | Fine | 125,000 | ASME B18.2.1 ASTM A193 ASTM A962 | 94705A826 | 00000 | ||
| 8" | 5 1/4" | 1 13/16" | 11/16" | Partially Threaded | Fine | 125,000 | ASME B18.2.1 ASTM A193 ASTM A962 | 94705A828 | 00000 | ||
1 1/4"-8 | |||||||||||
| 3" | — | 2" | 25/32" | Fully Threaded | Fine | 125,000 | ASME B18.2.1 ASTM A193 ASTM A962 | 94705A829 | 00000 | ||
| 3 1/4" | — | 2" | 25/32" | Fully Threaded | Fine | 125,000 | ASME B18.2.1 ASTM A193 ASTM A962 | 94705A831 | 00000 | ||
| 3 1/2" | — | 2" | 25/32" | Fully Threaded | Fine | 125,000 | ASME B18.2.1 ASTM A193 ASTM A962 | 94705A832 | 00000 | ||
| 3 3/4" | — | 2" | 25/32" | Fully Threaded | Fine | 125,000 | ASME B18.2.1 ASTM A193 ASTM A962 | 94705A833 | 00000 | ||
| 4" | 1 1/4" | 2" | 25/32" | Partially Threaded | Fine | 125,000 | ASME B18.2.1 ASTM A193 ASTM A962 | 94705A834 | 00000 | ||
| 4 1/4" | 1 1/2" | 2" | 25/32" | Partially Threaded | Fine | 125,000 | ASME B18.2.1 ASTM A193 ASTM A962 | 94705A835 | 00000 | ||
| 4 1/2" | 1 3/4" | 2" | 25/32" | Partially Threaded | Fine | 125,000 | ASME B18.2.1 ASTM A193 ASTM A962 | 94705A836 | 00000 | ||
| 5" | 2 1/4" | 2" | 25/32" | Partially Threaded | Fine | 125,000 | ASME B18.2.1 ASTM A193 ASTM A962 | 94705A838 | 00000 | ||
| 5 1/4" | 2 1/2" | 2" | 25/32" | Partially Threaded | Fine | 125,000 | ASME B18.2.1 ASTM A193 ASTM A962 | 94705A839 | 00000 | ||
| 5 1/2" | 2 3/4" | 2" | 25/32" | Partially Threaded | Fine | 125,000 | ASME B18.2.1 ASTM A193 ASTM A962 | 94705A841 | 00000 | ||
| 5 3/4" | 3" | 2" | 25/32" | Partially Threaded | Fine | 125,000 | ASME B18.2.1 ASTM A193 ASTM A962 | 94705A842 | 00000 | ||
| 6" | 3 1/4" | 2" | 25/32" | Partially Threaded | Fine | 125,000 | ASME B18.2.1 ASTM A193 ASTM A962 | 94705A843 | 00000 | ||
| 6 1/4" | 3 1/4" | 2" | 25/32" | Partially Threaded | Fine | 125,000 | ASME B18.2.1 ASTM A193 ASTM A962 | 94705A844 | 00000 | ||
| 6 1/2" | 3 1/2" | 2" | 25/32" | Partially Threaded | Fine | 125,000 | ASME B18.2.1 ASTM A193 ASTM A962 | 94705A845 | 00000 | ||
| 7" | 4" | 2" | 25/32" | Partially Threaded | Fine | 125,000 | ASME B18.2.1 ASTM A193 ASTM A962 | 94705A847 | 00000 | ||
| 7 1/2" | 4 1/2" | 2" | 25/32" | Partially Threaded | Fine | 125,000 | ASME B18.2.1 ASTM A193 ASTM A962 | 94705A849 | 00000 | ||
| 8" | 5" | 2" | 25/32" | Partially Threaded | Fine | 125,000 | ASME B18.2.1 ASTM A193 ASTM A962 | 94705A851 | 00000 | ||
1 1/2"-8 | |||||||||||
| 3" | — | 2 3/8" | 15/16" | Fully Threaded | Fine | 125,000 | ASME B18.2.1 ASTM A193 ASTM A962 | 94705A116 | 00000 | ||
| 3 1/2" | — | 2 3/8" | 15/16" | Fully Threaded | Fine | 125,000 | ASME B18.2.1 ASTM A193 ASTM A962 | 94705A117 | 00000 | ||
| 4" | — | 2 3/8" | 15/16" | Fully Threaded | Fine | 125,000 | ASME B18.2.1 ASTM A193 ASTM A962 | 94705A118 | 00000 | ||
| 4 1/2" | — | 2 3/8" | 15/16" | Fully Threaded | Fine | 125,000 | ASME B18.2.1 ASTM A193 ASTM A962 | 94705A119 | 00000 | ||
| 5" | 1 3/4" | 2 3/8" | 15/16" | Partially Threaded | Fine | 125,000 | ASME B18.2.1 ASTM A193 ASTM A962 | 94705A121 | 00000 | ||
| 5 1/2" | 2 1/4" | 2 3/8" | 15/16" | Partially Threaded | Fine | 125,000 | ASME B18.2.1 ASTM A193 ASTM A962 | 94705A122 | 00000 | ||
| 6" | 2 3/4" | 2 3/8" | 15/16" | Partially Threaded | Fine | 125,000 | ASME B18.2.1 ASTM A193 ASTM A962 | 94705A123 | 00000 | ||
1 3/4"-8 | |||||||||||
| 4" | — | 2 3/4" | 1 3/32" | Fully Threaded | Fine | 125,000 | ASME B18.2.1 ASTM A193 ASTM A962 | 94705A124 | 00000 | ||
| 5" | 1 1/4" | 2 3/4" | 1 3/32" | Partially Threaded | Fine | 125,000 | ASME B18.2.1 ASTM A193 ASTM A962 | 94705A125 | 00000 | ||
| 6" | 2 1/4" | 2 3/4" | 1 3/32" | Partially Threaded | Fine | 125,000 | ASME B18.2.1 ASTM A193 ASTM A962 | 94705A126 | 00000 | ||
| 7" | 3" | 2 3/4" | 1 3/32" | Partially Threaded | Fine | 125,000 | ASME B18.2.1 ASTM A193 ASTM A962 | 94705A127 | 00000 | ||
| 8" | 4" | 2 3/4" | 1 3/32" | Partially Threaded | Fine | 125,000 | ASME B18.2.1 ASTM A193 ASTM A962 | 94705A128 | 00000 | ||
High-Pressure Stainless Steel Heavy Hex Head Screws
 |
Fully 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.
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Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.
Head | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Lg. | Wd. | Ht. | Threading | Thread Spacing | Tensile Strength, psi | Specs. Met | Each | |||
Highly Corrosion-Resistant ASTM Grade B8M 316 Stainless Steel | ||||||||||
1 1/8"-8 | ||||||||||
| 3" | 1 13/16" | 11/16" | Fully Threaded | Fine | 75,000 | ASTM A193 ASTM A962 | 92790A109 | 0000000 | ||
| 3 1/2" | 1 13/16" | 11/16" | Fully Threaded | Fine | 75,000 | ASTM A193 ASTM A962 | 92790A108 | 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 | ||
Steel Socket Head Screws
 |
Fully Threaded |
 |
Partially Threaded |
Made of alloy steel, these screws are the standard for high-strength fastening. Use them in high-load applications such as dies, presses, and heavy equipment. The deep, six-point socket keeps the hex key from slipping out and damaging the drive.
Length is measured from under the head.
Black-Oxide Alloy Steel—Best for dry environments since moisture will cause these screws to rust. They have a dark, matte appearance.
Head | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Lg. | Dia. | Ht. | Threading | Thread Spacing | Tensile Strength, psi | Pkg. Qty. | Pkg. | |||
Black-Oxide Alloy Steel | ||||||||||
2"-8 | ||||||||||
| 6" | 3" | 2" | Partially Threaded | Fine | 170,000 | 1 | 90044A221 | 0000000 | ||
| 8" | 3" | 2" | Partially Threaded | Fine | 170,000 | 1 | 90044A222 | 000000 | ||
| 12" | 3" | 2" | Partially Threaded | Fine | 170,000 | 1 | 90044A223 | 000000 | ||
2 1/4"-8 | ||||||||||
| 6" | 3 3/8" | 2 1/4" | Partially Threaded | Coarse | 170,000 | 1 | 90044A228 | 000000 | ||
| 8" | 3 3/8" | 2 1/4" | Partially Threaded | Coarse | 170,000 | 1 | 90044A229 | 000000 | ||
| 10" | 3 3/8" | 2 1/4" | Partially Threaded | Coarse | 170,000 | 1 | 90044A230 | 000000 | ||
2 1/2"-8 | ||||||||||
| 4" | 3 3/4" | 2 1/2" | Fully Threaded | Fine | 170,000 | 1 | 90044A235 | 000000 | ||
| 6" | 3 3/4" | 2 1/2" | Fully Threaded | Fine | 170,000 | 1 | 90044A236 | 000000 | ||
| 8" | 3 3/4" | 2 1/2" | Partially Threaded | Fine | 170,000 | 1 | 90044A237 | 000000 | ||
| 10" | 3 3/4" | 2 1/2" | Partially Threaded | Fine | 170,000 | 1 | 90044A238 | 000000 | ||
