The size of the Jacobs key is a 5/8" T handle model TDC-625. Please contact the manufacturer for replacement part number 561708-CK.
JET JT-3 Drill Chuck, 5/8in., Model# TDC-625

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- Heat-treated high-grade alloy steel construction
- Chuck jaws are precision fitted to withstand up to 115 psi of torque without distortion
- Meets JIS Specifications: B4634E Grade
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