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Tamper-Resistant Asymmetrical-Drive Stainless Steel Button Head Screws
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These screws have a unique drive that's only available from McMaster-Carr. The drive, which has a security pin in it, only turns with an asymmetrical driver. Made of stainless steel, they won't rust or corrode when exposed to moisture and chemicals. The button head looks similar to a pan head, but it's lower and more compact, taking up less space.
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.
Screws | Screwdriver Bits | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Head | ||||||||||||
Lg. | Dia. | Ht. | Threading | Tensile Strength, psi | Specs. Met | Pkg. Qty. | Pkg. | Each | ||||
18-8 Stainless Steel | ||||||||||||
1/4"-20 | ||||||||||||
| 1/2" | 0.437" | 0.132" | Fully Threaded | 70,000 | ASME B18.3 | 5 | 99355A305 | 000000 | 99355A624 | 000000 | ||
| 3/4" | 0.437" | 0.132" | Fully Threaded | 70,000 | ASME B18.3 | 5 | 99355A311 | 00000 | 99355A624 | 00000 | ||
| 1" | 0.437" | 0.132" | Fully Threaded | 70,000 | ASME B18.3 | 5 | 99355A314 | 00000 | 99355A624 | 00000 | ||
| 1 1/4" | 0.437" | 0.132" | Fully Threaded | 70,000 | ASME B18.3 | 5 | 99355A317 | 00000 | 99355A624 | 00000 | ||
| 1 1/2" | 0.437" | 0.132" | Fully Threaded | 70,000 | ASME B18.3 | 5 | 99355A320 | 00000 | 99355A624 | 00000 | ||
Asymmetrical Bits
 |
Drive Size | Overall Lg. | Material | Each | |||
|---|---|---|---|---|---|---|
For Hand Tools | ||||||
1/4" Hex Shank Size | ||||||
| U25 | 1" | Steel | 99355A624 | 000000 | ||
