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Head Type Head Type | Show |
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 | Pentagon |
Head Type Head Type | Hide |
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| Socket | Rounded |
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| Hex | Flat |
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| Headless | Thumb |
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| Oval | 12-Point |
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| Square | Tee |
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| Eye | T-Slot |
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| Pentagon | Domed |
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| Hook |
System of Measurement System of Measurement |
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Thread Type Thread Type |
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Material Material |
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Drive Style Drive Style |
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 | External 5-Point |
Drive Size Drive Size |
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Threading Threading |
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 | Fully Threaded |
Tensile Strength Tensile Strength |
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Thread Direction Thread Direction |
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 | Right Hand |
Hardness Hardness |
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Thread Fit Thread Fit |
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Thread Spacing Thread Spacing |
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Pentagon Head Screws
The five-sided head provides tamper resistance by making these screws difficult to remove without special tools. Install or remove with 5-point sockets (sold separately). Also known as penta-bolts and 5-point screws, they are commonly used on water and gas valves. They are made from 18-8 stainless steel, which has good chemical resistance and may be mildly magnetic. Length is measured from under the head.
Head | ||||||||
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| Lg. | Threading | Thread Spacing | Wd. | Ht. | Drive Size | Tensile Strength, psi | Each | |
18-8 Stainless Steel | ||||||||
3/8"-16 | ||||||||
| 3/4" | Fully Threaded | Coarse | 7/8" | 5/16" | 13/16" | 70,000 | 000000000 | 00000 |
| 1" | Fully Threaded | Coarse | 7/8" | 5/16" | 13/16" | 70,000 | 000000000 | 0000 |
| 1 1/2" | Fully Threaded | Coarse | 7/8" | 5/16" | 13/16" | 70,000 | 000000000 | 0000 |
| 2" | Fully Threaded | Coarse | 7/8" | 5/16" | 13/16" | 70,000 | 000000000 | 0000 |
| 2 1/4" | Fully Threaded | Coarse | 7/8" | 5/16" | 13/16" | 70,000 | 000000000 | 0000 |
| 2 1/2" | Fully Threaded | Coarse | 7/8" | 5/16" | 13/16" | 70,000 | 000000000 | 0000 |
| 3" | Fully Threaded | Coarse | 7/8" | 5/16" | 13/16" | 70,000 | 000000000 | 0000 |
| 4" | Fully Threaded | Coarse | 7/8" | 5/16" | 13/16" | 70,000 | 000000000 | 0000 |
1/2"-13 | ||||||||
| 1 1/2" | Fully Threaded | Coarse | 7/8" | 5/16" | 13/16" | 70,000 | 000000000 | 0000 |
| 1 3/4" | Fully Threaded | Coarse | 7/8" | 5/16" | 13/16" | 70,000 | 000000000 | 0000 |
| 2" | Fully Threaded | Coarse | 7/8" | 5/16" | 13/16" | 70,000 | 000000000 | 0000 |
| 2 1/2" | Fully Threaded | Coarse | 7/8" | 5/16" | 13/16" | 70,000 | 000000000 | 0000 |
| 3" | Fully Threaded | Coarse | 7/8" | 5/16" | 13/16" | 70,000 | 000000000 | 0000 |
| 4" | Fully Threaded | Coarse | 7/8" | 5/16" | 13/16" | 70,000 | 000000000 | 0000 |
| 4 1/2" | Fully Threaded | Coarse | 7/8" | 5/16" | 13/16" | 70,000 | 000000000 | 0000 |