• NSR 4421 Replacement 0.9mm Allen Driver Tip – Heat-Treated Steel
NSR 4421 0.9mm replacement Allen driver tip
NSR 4421 0.9mm replacement Allen driver tip

    NSR 4421 Replacement 0.9mm Allen Driver Tip – Heat-Treated Steel

    $4.46
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    NSR 4421 replacement 0.9 mm (.035") heat-treated steel tip for NSR precision Allen drivers.

    A worn hex tip is one of the fastest ways to round a tiny slot-car grub screw. Replacing only the driver tip restores a crisp fit without replacing the complete handle.

    Why racers keep a spare

    • Sharp 0.9 mm hex profile for positive engagement with small set screws
    • Heat-treated steel for wear resistance
    • Restores control when adjusting gears, hubs and other precision hardware
    • Less chance of slipping and damaging expensive racing hardware

    Pro tip: Seat the driver fully before applying torque. If a grub screw feels unusually tight, clean the hex socket before forcing it.

    • Manufacturer: NSR
    • Part number: 4421
    • Size: 0.9 mm / .035"
    • Material: Heat-treated steel
    • Country of origin: Italy
    • HS code: 9503.00
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