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Drive Style Drive Style |
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System of Measurement System of Measurement |
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Size Size | Show |
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Size Size | Hide |
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Rounded Head Style Rounded Head Style |
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Material Material |
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Head Type Head Type |
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 | Rounded |
REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration,Evaluation, Authorization and Restriction of Chemicals) |
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Specifications Met Specifications Met |
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Thread Fit Thread Fit |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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Hardness Hardness |
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RoHS (Restriction of Hazardous Substances) RoHS (Restriction ofHazardous Substances) |
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Tensile Strength Tensile Strength |
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Rounded Head Profile Rounded Head Profile |
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Thread Direction Thread Direction |
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Threading Threading |
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 | Fully Threaded |
About Rounded Head Screws
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Tamper-Resistant Asymmetrical Drive Button Head Screws
These button head screws have a unique drive that is sold only by McMaster-Carr, making them difficult to remove without a special driver bit (sold separately). Made from 18-8 stainless steel, they have good chemical resistance and may be mildly magnetic. Length is measured from under the head.
For technical drawings and 3-D models, click on a part number.
Screws | Driver Bits | ||||||||||
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| Lg. | Threading | Head Dia. | Head Ht. | Drive Size | Tensile Strength, psi | Specifications Met | Pkg. Qty. | Pkg. | Each | ||
18-8 Stainless Steel | |||||||||||
6-32 | |||||||||||
| 1/2" | Fully Threaded | 0.262" | 0.073" | U10 | 70,000 | ASME B18.3 | 5 | 000000000 | 000000 | 000000000 | 000000 |
| 1" | Fully Threaded | 0.262" | 0.073" | U10 | 70,000 | ASME B18.3 | 5 | 000000000 | 00000 | 000000000 | 00000 |
8-32 | |||||||||||
| 1/2" | Fully Threaded | 0.312" | 0.087" | U10 | 70,000 | ASME B18.3 | 5 | 000000000 | 00000 | 000000000 | 00000 |
| 3/4" | Fully Threaded | 0.312" | 0.087" | U10 | 70,000 | ASME B18.3 | 5 | 000000000 | 00000 | 000000000 | 00000 |
| 1" | Fully Threaded | 0.312" | 0.087" | U10 | 70,000 | ASME B18.3 | 5 | 000000000 | 00000 | 000000000 | 00000 |
10-24 | |||||||||||
| 1/2" | Fully Threaded | 0.361" | 0.101" | U10 | 70,000 | ASME B18.3 | 5 | 000000000 | 00000 | 000000000 | 00000 |
| 1" | Fully Threaded | 0.361" | 0.101" | U10 | 70,000 | ASME B18.3 | 5 | 000000000 | 00000 | 000000000 | 00000 |
| 1 1/4" | Fully Threaded | 0.361" | 0.101" | U10 | 70,000 | ASME B18.3 | 5 | 000000000 | 00000 | 000000000 | 00000 |
| 1 1/2" | Fully Threaded | 0.361" | 0.101" | U10 | 70,000 | ASME B18.3 | 5 | 000000000 | 00000 | 000000000 | 00000 |
10-32 | |||||||||||
| 1/2" | Fully Threaded | 0.400" | 0.115" | U10 | 70,000 | ASME B18.3 | 5 | 000000000 | 00000 | 000000000 | 00000 |
| 3/4" | Fully Threaded | 0.400" | 0.115" | U10 | 70,000 | ASME B18.3 | 5 | 000000000 | 00000 | 000000000 | 00000 |
| 1" | Fully Threaded | 0.400" | 0.115" | U10 | 70,000 | ASME B18.3 | 5 | 000000000 | 00000 | 000000000 | 00000 |
| 1 1/4" | Fully Threaded | 0.400" | 0.115" | U10 | 70,000 | ASME B18.3 | 5 | 000000000 | 00000 | 000000000 | 00000 |
| 1 1/2" | Fully Threaded | 0.400" | 0.115" | U10 | 70,000 | ASME B18.3 | 5 | 000000000 | 00000 | 000000000 | 00000 |