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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.
Tension-Indicating Steel Hex Head Screws
 |
 |
Fully Threaded |
 |
Partially Threaded |
An indicator dot changes from red to black when these screws are properly tightened. If they come loose, the dot changes back to red. Also known as SmartBolts, they let you know when vibration or heavy use loosen screws in high-stress applications, such as valves, pumps, and motors. The head's six flat sides 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 | Tension Indicated, lbf | Indicator Temp., ° F | Each | |||
High-Strength Zinc-Yellow-Chromate-Plated Steel | ||||||||||||
1/2"-13 | ||||||||||||
| 1 1/2" | 3/4" | 3/8" | Fully Threaded | Coarse | SAE Grade 8 | 150,000 | 10,000 | 0 to 165 | 93734A120 | 000000 | ||
| 1 3/4" | 3/4" | 3/8" | Fully Threaded | Coarse | SAE Grade 8 | 150,000 | 10,000 | 0 to 165 | 93734A140 | 00000 | ||
| 2" | 3/4" | 3/8" | Partially Threaded | Coarse | SAE Grade 8 | 150,000 | 10,000 | 0 to 165 | 93734A160 | 00000 | ||
| 2 1/2" | 3/4" | 3/8" | Partially Threaded | Coarse | SAE Grade 8 | 150,000 | 10,500 | 0 to 165 | 93734A180 | 00000 | ||
| 3" | 3/4" | 3/8" | Partially Threaded | Coarse | SAE Grade 8 | 150,000 | 12,000 | 0 to 165 | 93734A200 | 00000 | ||
5/8"-11 | ||||||||||||
| 2" | 15/16" | 29/64" | Fully Threaded | Coarse | SAE Grade 8 | 150,000 | 17,000 | 0 to 165 | 93734A350 | 00000 | ||
| 2 1/2" | 15/16" | 29/64" | Partially Threaded | Coarse | SAE Grade 8 | 150,000 | 17,000 | 0 to 165 | 93734A370 | 00000 | ||
| 3" | 15/16" | 29/64" | Partially Threaded | Coarse | SAE Grade 8 | 150,000 | 19,000 | 0 to 165 | 93734A390 | 00000 | ||
3/4"-10 | ||||||||||||
| 2" | 1 1/8" | 17/32" | Fully Threaded | Coarse | SAE Grade 8 | 150,000 | 26,000 | 0 to 165 | 93734A520 | 00000 | ||
| 3" | 1 1/8" | 17/32" | Partially Threaded | Coarse | SAE Grade 8 | 150,000 | 27,000 | 0 to 165 | 93734A560 | 00000 | ||
