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    15 Products

    Tamper-Resistant Asymmetrical-Drive Stainless Steel Button Head Screws

    Image of Product. Front orientation. Contains MultipleImages. Rounded Head Screws. Tamper-Resistant Asymmetrical-Drive Stainless Steel Button Head Screws.
    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
     
    6-32
    1/2"0.262"0.073"Fully Threaded70,000ASME B18.35000000000000000000000000000000
    1"0.262"0.073"Fully Threaded70,000ASME B18.350000000000000000000000000000
     
    8-32
    1/2"0.312"0.087"Fully Threaded70,000ASME B18.350000000000000000000000000000
    3/4"0.312"0.087"Fully Threaded70,000ASME B18.350000000000000000000000000000
    1"0.312"0.087"Fully Threaded70,000ASME B18.350000000000000000000000000000
     
    10-24
    1/2"0.361"0.101"Fully Threaded70,000ASME B18.350000000000000000000000000000
    1"0.361"0.101"Fully Threaded70,000ASME B18.350000000000000000000000000000
    1 1/4"0.361"0.101"Fully Threaded70,000ASME B18.350000000000000000000000000000
    1 1/2"0.361"0.101"Fully Threaded70,000ASME B18.350000000000000000000000000000
     
    10-32
    1/2"0.4"0.115"Fully Threaded70,000ASME B18.350000000000000000000000000000
    3/4"0.4"0.115"Fully Threaded70,000ASME B18.350000000000000000000000000000
    1"0.4"0.115"Fully Threaded70,000ASME B18.350000000000000000000000000000
    1 1/4"0.4"0.115"Fully Threaded70,000ASME B18.350000000000000000000000000000
    1 1/2"0.4"0.115"Fully Threaded70,000ASME B18.350000000000000000000000000000
     

    Asymmetrical Bits

    Image of Product. Front orientation. Screwdriver Bits. Asymmetrical Bits.
    Access restricted equipment secured with asymmetrical screws. These bits have a unique drive that's only available from McMaster-Carr, so they're a favorite for thwarting thieves.
    Hex Shank—Also known as insert bits, these snap into hand tools. If you want to use them with power tools, attach a bit adapter (not included).
    Steel—Best for dry environments, since moisture will cause these bits to rust.
    Drive
    Size
    Overall
    Lg.
    Material
    Each
    For Hand Tools
     
    1/4" Hex Shank Size
    U101"Steel000000000000000
     
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