McMaster-Carr logo
    Enter e-mail addresses in the fields below
    Message
    Cancel
    Comments
    E-mail address (if you would like a response)
    70 Products

    Tamper-Resistant One-Way-Drive Stainless Steel Round Head Screws

    Image of Product. Front orientation. Contains MultipleImages. Rounded Head Screws. Tamper-Resistant One-Way-Drive Stainless Steel Round Head Screws.
    Install these tamper-resistant screws in corrosive environments with a common slotted driver. Once installed, the drive’s sloped walls cause drivers to slip, making these screws difficult to remove without one-way screw removers. They're often found on public facilities, such as restroom partitions and other long-term installations, where tamper resistance is important and removal for maintenance is unlikely.
    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.
    One-Way Screw Removers—Extract one-way screws. With two pins on the driver's end, they grip one-way screws to loosen them when slotted drivers just slip.
    Screws
    One-Way
    Screw Removers
    Head
    Lg.
    Dia.
    Ht.
    Threading
    Tensile Strength,
    psi
    Specs. Met
    Pkg.
    Qty.
    Pkg.
    Each
    18-8 Stainless Steel
     
    4-40
    3/16"0.211"0.086"Fully Threaded80,00010090288A1040000007392A52000000
    1/4"0.211"0.086"Fully Threaded80,00010090288A106000007392A5200000
    3/8"0.211"0.086"Fully Threaded80,000ASME B18.6.310090288A108000007392A5200000
    1/2"0.211"0.086"Fully Threaded80,000ASME B18.6.310090288A110000007392A5200000
    3/4"0.211"0.086"Fully Threaded80,00010090288A112000007392A5200000
     
    6-32
    3/16"0.26"0.103"Fully Threaded80,000ASME B18.6.310090288A143000007392A5200000
    1/4"0.26"0.103"Fully Threaded80,000ASME B18.6.310090288A144000007392A5200000
    3/8"0.26"0.103"Fully Threaded80,000ASME B18.6.310090288A146000007392A5200000
    1/2"0.26"0.103"Fully Threaded80,000ASME B18.6.310090288A148000007392A5200000
    3/4"0.26"0.103"Fully Threaded80,000ASME B18.6.310090288A151000007392A5200000
    1"0.26"0.103"Fully Threaded80,000ASME B18.6.35090288A153000007392A5200000
    1 1/2"0.26"0.103"Fully Threaded80,000ASME B18.6.35090288A157000007392A5200000
     
    8-32
    1/4"0.309"0.12"Fully Threaded80,000ASME B18.6.35090288A190000007392A5200000
    3/8"0.309"0.12"Fully Threaded80,000ASME B18.6.35090288A192000007392A5200000
    1/2"0.309"0.12"Fully Threaded80,000ASME B18.6.35090288A194000007392A5200000
    3/4"0.309"0.12"Fully Threaded80,000ASME B18.6.35090288A197000007392A5200000
    1"0.309"0.12"Fully Threaded80,000ASME B18.6.35090288A199000007392A5200000
    1 1/2"0.309"0.12"Fully Threaded80,000ASME B18.6.35090288A203000007392A5200000
     
    10-24
    1/2"0.359"0.137"Fully Threaded80,000ASME B18.6.35090288A242000007392A6300000
    3/4"0.359"0.137"Fully Threaded80,000ASME B18.6.35090288A245000007392A6300000
    1"0.359"0.137"Fully Threaded80,000ASME B18.6.35090288A247000007392A6300000
    1 1/4"0.359"0.137"Fully Threaded80,000ASME B18.6.35090288A249000007392A6300000
    1 1/2"0.359"0.137"Fully Threaded80,000ASME B18.6.32590288A251000007392A6300000
     
    10-32
    1/4"0.359"0.137"Fully Threaded80,0005090288A270000007392A6300000
    3/8"0.359"0.137"Fully Threaded80,0005090288A274000007392A6300000
    1/2"0.359"0.137"Fully Threaded80,000ASME B18.6.35090288A829000007392A6300000
    5/8"0.359"0.137"Fully Threaded80,000ASME B18.6.35090288A830000007392A6300000
    3/4"0.359"0.137"Fully Threaded80,000ASME B18.6.35090288A831000007392A6300000
    1"0.359"0.137"Fully Threaded80,000ASME B18.6.35090288A833000007392A6300000
    1 1/4"0.359"0.137"Fully Threaded80,000ASME B18.6.32590288A835000007392A6300000
    1 1/2"0.359"0.137"Fully Threaded80,000ASME B18.6.32590288A836000007392A6300000
     
    1/4"-20
    3/8"0.472"0.175"Fully Threaded80,0002590288A536000007392A6400000
    1/2"0.472"0.175"Fully Threaded80,0002590288A537000007392A6400000
    3/4"0.472"0.175"Fully Threaded80,0002590288A540000007392A6400000
    1"0.472"0.175"Fully Threaded80,0002590288A542000007392A6400000
    1 1/2"0.472"0.175"Fully Threaded80,0002590288A546000007392A6400000
    2"0.472"0.175"Fully Threaded80,000ASME B18.6.31090288A550000007392A6400000
     

    Tamper-Resistant One-Way-Drive Steel Round Head Screws

    Image of Product. Front orientation. Rounded Head Screws. Tamper-Resistant One-Way-Drive Steel Round Head Screws.
    Install these tamper-resistant screws with a common slotted driver. Once installed, the drive's sloped walls cause drivers to slip, making these screws difficult to remove without one-way screw removers. They're often found on public facilities, such as restroom partitions and other long-term installations, where tamper resistance is important and removal for maintenance is unlikely.
    Length is measured from under the head.
    Zinc-Plated Steel—A common choice for areas with occasional exposure to moisture.
    One-Way Screw Removers—Extract one-way screws. With two pins on the driver's end, they grip one-way screws to loosen them when slotted drivers just slip.
    Screws
    One-Way
    Screw Removers
    Head
    Lg.
    Dia.
    Ht.
    Threading
    Tensile Strength,
    psi
    Specs. Met
    Pkg.
    Qty.
    Pkg.
    Each
    Zinc-Plated Steel
     
    4-40
    1/4"0.211"0.086"Fully Threaded60,00010090287A8370000007392A52000000
    3/8"0.211"0.086"Fully Threaded60,00010090287A838000007392A5200000
    1/2"0.211"0.086"Fully Threaded60,00010090287A839000007392A5200000
    3/4"0.211"0.086"Fully Threaded60,00010090287A841000007392A5200000
     
    6-32
    1/4"0.26"0.103"Fully Threaded60,00010090287A842000007392A5200000
    3/8"0.26"0.103"Fully Threaded60,000ASME B18.6.310090287A146000007392A5200000
    1/2"0.26"0.103"Fully Threaded60,000ASME B18.6.310090287A148000007392A5200000
    3/4"0.26"0.103"Fully Threaded60,000ASME B18.6.310090287A151000007392A5200000
    1"0.26"0.103"Fully Threaded60,000ASME B18.6.310090287A153000007392A5200000
     
    8-32
    1/4"0.309"0.12"Fully Threaded60,00010090287A843000007392A5200000
    3/8"0.309"0.12"Fully Threaded60,00010090287A844000007392A5200000
    1/2"0.309"0.12"Fully Threaded60,000ASME B18.6.310090287A194000007392A5200000
    3/4"0.309"0.12"Fully Threaded60,000ASME B18.6.310090287A197000007392A5200000
    1"0.309"0.12"Fully Threaded60,000ASME B18.6.310090287A199000007392A5200000
    1 1/2"0.309"0.12"Fully Threaded60,000ASME B18.6.310090287A203000007392A5200000
     
    10-24
    1/2"0.359"0.137"Fully Threaded60,000ASME B18.6.310090287A242000007392A6300000
    3/4"0.359"0.137"Fully Threaded60,000ASME B18.6.310090287A245000007392A6300000
    1"0.359"0.137"Fully Threaded60,000ASME B18.6.310090287A247000007392A6300000
    1 1/2"0.359"0.137"Fully Threaded60,000ASME B18.6.35090287A251000007392A6300000
     
    10-32
    1/4"0.359"0.137"Fully Threaded60,00010090287A846000007392A6300000
    3/8"0.359"0.137"Fully Threaded60,00010090287A847000007392A6300000
    1/2"0.359"0.137"Fully Threaded60,000ASME B18.6.310090287A829000007392A6300000
    3/4"0.359"0.137"Fully Threaded60,000ASME B18.6.310090287A831000007392A6300000
    1"0.359"0.137"Fully Threaded60,000ASME B18.6.310090287A833000007392A6300000
    1 1/2"0.359"0.137"Fully Threaded60,000ASME B18.6.35090287A836000007392A6300000
     
    1/4"-20
    3/8"0.472"0.175"Fully Threaded60,0005090287A848000007392A6400000
    1/2"0.472"0.175"Fully Threaded60,000ASME B18.6.35090287A537000007392A6400000
    3/4"0.472"0.175"Fully Threaded60,000ASME B18.6.35090287A540000007392A6400000
    1"0.472"0.175"Fully Threaded60,000ASME B18.6.35090287A542000007392A6400000
    1 1/2"0.472"0.175"Fully Threaded60,000ASME B18.6.35090287A546000007392A6400000
     
    back to top