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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 Hex Head Screws
 |  |
Fully Threaded | Partially Threaded |
Our most popular hex head screws. These have a head with 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.
Zinc-Yellow-Chromate-Plated Steel—With slightly better corrosion resistance than zinc-plated steel screws, these stand up to more frequent exposure to moisture.
Head | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Lg. | Wd. | Ht. | Threading | Thread Spacing | Fastener Strength Grade/Class | Tensile Strength, psi | Pkg. Qty. | Pkg. | |||
High-Strength Zinc-Yellow-Chromate-Plated Steel | |||||||||||
1/4"-32 | |||||||||||
| 3/4" | 7/16" | 5/32" | Fully Threaded | Extra Fine | SAE Grade 8 | 150,000 | 1 | 92620A111 | 000000 | ||
| 1" | 7/16" | 5/32" | Fully Threaded | Extra Fine | SAE Grade 8 | 150,000 | 1 | 92620A112 | 00000 | ||
| 1 1/4" | 7/16" | 5/32" | Partially Threaded | Extra Fine | SAE Grade 8 | 150,000 | 1 | 92620A113 | 00000 | ||
| 1 1/2" | 7/16" | 5/32" | Partially Threaded | Extra Fine | SAE Grade 8 | 150,000 | 1 | 92620A114 | 00000 | ||
5/16"-32 | |||||||||||
| 3/4" | 1/2" | 13/64" | Fully Threaded | Extra Fine | SAE Grade 8 | 150,000 | 1 | 92620A115 | 00000 | ||
| 1" | 1/2" | 13/64" | Fully Threaded | Extra Fine | SAE Grade 8 | 150,000 | 1 | 92620A116 | 00000 | ||
| 1 1/4" | 1/2" | 13/64" | Fully Threaded | Extra Fine | SAE Grade 8 | 150,000 | 1 | 92620A117 | 00000 | ||
| 1 1/2" | 1/2" | 13/64" | Partially Threaded | Extra Fine | SAE Grade 8 | 150,000 | 1 | 92620A118 | 00000 | ||
| 2" | 1/2" | 13/64" | Partially Threaded | Extra Fine | SAE Grade 8 | 150,000 | 1 | 92620A119 | 00000 | ||
3/8"-32 | |||||||||||
| 1" | 9/16" | 15/64" | Fully Threaded | Extra Fine | SAE Grade 8 | 150,000 | 1 | 92620A121 | 00000 | ||
| 1 1/4" | 9/16" | 15/64" | Fully Threaded | Extra Fine | SAE Grade 8 | 150,000 | 1 | 92620A122 | 00000 | ||
| 1 1/2" | 9/16" | 15/64" | Partially Threaded | Extra Fine | SAE Grade 8 | 150,000 | 1 | 92620A123 | 00000 | ||
| 2" | 9/16" | 15/64" | Partially Threaded | Extra Fine | SAE Grade 8 | 150,000 | 1 | 92620A124 | 00000 | ||
| 2 1/2" | 9/16" | 15/64" | Partially Threaded | Extra Fine | SAE Grade 8 | 150,000 | 1 | 92620A125 | 00000 | ||
1/2"-28 | |||||||||||
| 1 1/4" | 3/4" | 5/16" | Fully Threaded | Extra Fine | SAE Grade 8 | 150,000 | 1 | 92620A126 | 00000 | ||
| 1 1/2" | 3/4" | 5/16" | Fully Threaded | Extra Fine | SAE Grade 8 | 150,000 | 1 | 92620A127 | 00000 | ||
| 2" | 3/4" | 5/16" | Partially Threaded | Extra Fine | SAE Grade 8 | 150,000 | 1 | 92620A128 | 00000 | ||
| 2 1/2" | 3/4" | 5/16" | Partially Threaded | Extra Fine | SAE Grade 8 | 150,000 | 1 | 92620A129 | 00000 | ||
| 3" | 3/4" | 5/16" | Partially Threaded | Extra Fine | SAE Grade 8 | 150,000 | 1 | 92620A131 | 00000 | ||
Steel Socket Head Screws
 |
Fully 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 | ||||||||||
1/4"-32 | ||||||||||
| 5/8" | 3/8" | 1/4" | Fully Threaded | Extra Fine | 170,000 | 5 | 90044A203 | 000000 | ||
| 3/4" | 3/8" | 1/4" | Fully Threaded | Extra Fine | 170,000 | 5 | 90044A204 | 00000 | ||
| 1" | 3/8" | 1/4" | Fully Threaded | Extra Fine | 170,000 | 5 | 90044A205 | 00000 | ||
| 1 1/2" | 3/8" | 1/4" | Fully Threaded | Extra Fine | 170,000 | 5 | 90044A206 | 00000 | ||
5/16"-32 | ||||||||||
| 3/4" | 15/32" | 5/16" | Fully Threaded | Extra Fine | 170,000 | 5 | 90044A207 | 00000 | ||
| 1" | 15/32" | 5/16" | Fully Threaded | Extra Fine | 170,000 | 5 | 90044A208 | 00000 | ||
| 1 1/4" | 15/32" | 5/16" | Fully Threaded | Extra Fine | 170,000 | 5 | 90044A209 | 00000 | ||
| 1 1/2" | 15/32" | 5/16" | Fully Threaded | Extra Fine | 170,000 | 5 | 90044A301 | 00000 | ||
Stainless Steel Button Head Hex-Drive Screws
 |
These button head screws won't corrode from moisture and chemicals, but they aren't as strong as alloy steel screws. The button head looks similar to a pan head, but it's lower and more compact, taking up less space. With six contact points, the hex drive withstands more torque than slotted and Phillips to securely grip your driver.
Length is measured from under the head.
18-8 Stainless Steel—The choice for wet and outdoor environments, these screws won't rust. However, they don't hold up to the harsh chemicals that 316 stainless steel can.
Head | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Lg. | Dia. | Ht. | Threading | Tensile Strength, psi | Certificate Type | Pkg. Qty. | Pkg. | |||
18-8 Stainless Steel | ||||||||||
1/4"-32 | ||||||||||
| 1/2" | 0.437" | 0.132" | Fully Threaded | 70,000 | Material Certificate | 1 | 92949A439 | 00000 | ||
| 3/4" | 0.437" | 0.132" | Fully Threaded | 70,000 | — | 1 | 92949A440 | 0000 | ||
| 1" | 0.437" | 0.132" | Fully Threaded | 70,000 | — | 1 | 92949A441 | 0000 | ||
5/16"-32 | ||||||||||
| 1/2" | 0.547" | 0.166" | Fully Threaded | 70,000 | Material Certificate | 1 | 92949A446 | 0000 | ||
| 3/4" | 0.547" | 0.166" | Fully Threaded | 70,000 | — | 1 | 92949A447 | 0000 | ||
| 1" | 0.547" | 0.166" | Fully Threaded | 70,000 | — | 1 | 92949A448 | 0000 | ||
3/8"-32 | ||||||||||
| 3/4" | 0.656" | 0.199" | Fully Threaded | 70,000 | Material Certificate | 1 | 92949A451 | 0000 | ||
| 1" | 0.656" | 0.199" | Fully Threaded | 70,000 | — | 1 | 92949A452 | 0000 | ||
| 1 1/2" | 0.656" | 0.199" | Fully Threaded | 70,000 | — | 1 | 92949A453 | 0000 | ||
Ball Screws and Nuts
 |
 |  |
A | Ball Nuts, Externally Threaded Nut, Style B |
Internal ball bearings provide smooth low-friction travel in applications that require high speeds, accurate positioning, and repeatable movement. Also known as single-start ball screws and nuts, they have a single thread that runs the length of the screw. They operate with more torque than fast-travel ball screws and nuts. To ensure compatibility, select components that have the same thread direction and size. Ball nuts are furnished with a tube to keep ball bearings in place. Do not remove the tube until you are ready to install the nuts onto the screws.
Externally Threaded Ball Nuts—Right-Hand Threaded
| |
A | Style B |
Black-Oxide Alloy Steel—Black-oxide alloy steel ball nuts have mild corrosion resistance.
Travel Distance per Turn—Travel distance per turn, also known as screw lead, is the distance a ball nut moves with one revolution of the ball screw.
Wipers—Secure a way wiper on the end of a ball nut to sweep chips and other contaminants out of the way as it moves across the ball screw.
Ball Screw Nuts | Wipers | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Style | Thread Size | Lg. | Wd. | Ht. | Dia. | No. of Thread Starts | Travel Distance per Turn | External Thread Size | Hardness | Dynamic Thrust Load Cap., lb. | Max. Backlash | Temp. Range, ° F | Each | Each | ||||
Black-Oxide Alloy Steel | ||||||||||||||||||
| A | 3/4"-5 | 2 7/8" | — | — | 1 1/4" | 1 | 0.2" | 1 1/8"-18 | Rockwell C56 | 1,900 | 0.015" | -65 to 300 | 3405N459 | 000000 | 2528N34 | 000000 | ||
| B | 1"-4 | 2 11/32" | 1 1/2" | 1 1/2" | — | 1 | 0.25" | 1 9/16"-18 | Rockwell C56 | 1,625 | 0.015" | -65 to 300 | 3405N463 | 000000 | ——— | 0 | ||
Externally Threaded Ball Nuts—Left-Hand Threaded
|
A |
Black-Oxide Alloy Steel—Black-oxide alloy steel ball nuts have mild corrosion resistance.
Travel Distance per Turn—Travel distance per turn, also known as screw lead, is the distance a ball nut moves with one revolution of the ball screw.
Style | Thread Size | Lg. | Wd. | Ht. | No. of Thread Starts | Travel Distance per Turn | External Thread Size | Hardness | Dynamic Thrust Load Cap., lb. | Max. Backlash | Temp. Range, ° F | Each | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Black-Oxide Alloy Steel | |||||||||||||||
| A | 1"-4 | 2 11/32" | 1 1/2" | 1 1/2" | 1 | 0.25" | 1 9/16"-18 | Rockwell C56 | 1,620 | 0.015" | -65 to 300 | 3405N457 | 0000000 | ||
Fast-Travel Ball Screws and Nuts
 |  |  |
Ball Nuts, Externally Threaded Nut, Style C | Ball Nuts, Externally Threaded Nut, Style D |
Externally Threaded Ball Nuts—Right-Hand Threaded
| |
Style C | Style D |
Black-Oxide Alloy Steel—Black-oxide alloy steel ball nuts have mild corrosion resistance.
Travel Distance per Turn—Travel distance per turn, also known as screw lead, is the distance a ball nut moves with one revolution of the ball screw.
Style | Thread Size | Lg. | Wd. | Ht. | Dia. | No. of Thread Starts | Travel Distance per Turn | External Thread Size | Hardness | Dynamic Thrust Load Cap., lb. | Max. Backlash | Temp. Range, ° F | Each | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Black-Oxide Alloy Steel | ||||||||||||||||
| C | 1"-4 | 3 1/8" | — | — | 1 11/16" | 2 | 0.5" | 1 9/16"-18 | Rockwell C56 | 4,250 | 0.015" | -65 to 300 | 3405N466 | 0000000 | ||
| D | 1"-4 | 3" | 1 1/2" | 1 1/2" | — | 4 | 1" | 1 9/16"-18 | Rockwell C56 | 2,300 | 0.015" | -65 to 300 | 3405N468 | 000000 | ||
