• Ko-ken 1/2" Sq. Dr. Ratchet Handle, 72-Tooth, 253mm (Z-Series) Front view
  • Ko-ken 1/2" Sq. Dr. Ratchet Handle, 72-Tooth, 253mm (Z-Series) mechanical drawing
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Ko-ken 1/2" Sq. Dr. Ratchet Handle, 72-Tooth, 253mm (Z-Series)

$149
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SKU: 4725Z

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    Ko-ken 1/2" Sq. Dr. Ratchet Handle, 72-Tooth, 253mm (Z-Series) Front view

    Ko-ken 1/2" Sq. Dr. Ratchet Handle, 72-Tooth, 253mm (Z-Series)
    72-Tooth Z-Series Ratchet for Tight Spaces & Real Torque

    72-Tooth Z-Series Ratchet for Tight Spaces & Real Torque

    • Ko-ken ratchets are known for precision engineering with low backlash, compact head size, and high torque performance.
    • This Z-Series 72-tooth design uses a patented dual pawl mechanism with a single spring for a smooth 5° arc swing—excellent control when you don’t have room to swing a long handle.
    • Ko-ken also increased internal contact area in the gear for a 10% higher torque limit while keeping the signature low-backlash feel.

    Specs

    Spec

    Detail

    Input Drive Size

    1/2"

    Drive Shape

    Square

    Head Type

    Fixed

    Gear Teeth

    72 Teeth

    Overall Length

    253mm

    Repair Kit

    4725RK-2

    Product Dimensions (Line Drawing)


    T: 32.8mm; D: 36.5mm; H: 18.2mm; L: 253mm

    Why 72 Teeth Matters (Quick Explanation)

    • 2-tooth gear = 5° swing arc for working around hoses, frames, and crowded engine bays.
    • Dual pawl + single spring design helps maintain a consistent feel and control under load.
    • Built for professional use where you need both smooth action and real torque capacity.

    Serviceable with the Correct Renewal Kit

    When it’s time to refresh the internals, use the correct repair kit:

    • Renewal / Repair Kit: 4725RK-2

    Best Uses (Shop Examples)

    • Tight-access 1/2" drive jobs where a coarse ratchet skips or needs too much swing (starter hardware, bracketry, skid plates, engine bay fasteners).
    • Mid-length 253mm handle gives strong leverage without being awkward in confined spaces.
    • Great “daily” 1/2" ratchet for techs who want smooth engagement and minimal backlash feel.

    In the Box

    • 1/2" Sq. Dr. Ratchet Handle, 72-tooth, 253mm (Ko-ken Z-Series)

    Care Notes

    • Z-series 72T model ratchet handles are maintenance free. Do not grease. High viscosity oil can reduce upper pawl movement and cause gear slippage.