Filter by
Drive Style
Material
Fastener Head Type
Threading
System of Measurement
Rounded Head Style
Thread Fit
Thread Direction
DFARS Specialty Metals
REACH
RoHS
Export Control Classification Number (ECCN)
Hardness
Specifications Met
Rounded Head Profile
Tensile Strength
About Rounded Head Screws
More
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 | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 |
1/4"-20 | |||||||||||
| 1/2" | Fully Threaded | 0.437" | 0.132" | U25 | 70,000 | ASME B18.3 | 5 | 000000000 | 00000 | 000000000 | 00000 |
| 3/4" | Fully Threaded | 0.437" | 0.132" | U25 | 70,000 | ASME B18.3 | 5 | 000000000 | 00000 | 000000000 | 00000 |
| 1" | Fully Threaded | 0.437" | 0.132" | U25 | 70,000 | ASME B18.3 | 5 | 000000000 | 00000 | 000000000 | 00000 |
| 1 1/4" | Fully Threaded | 0.437" | 0.132" | U25 | 70,000 | ASME B18.3 | 5 | 000000000 | 00000 | 000000000 | 00000 |
| 1 1/2" | Fully Threaded | 0.437" | 0.132" | U25 | 70,000 | ASME B18.3 | 5 | 000000000 | 00000 | 000000000 | 00000 |