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The JACOBS 30637 is a replacement jaw guide designed for use with keyless precision drill chucks. The jaw guide is a critical internal component that maintains proper alignment and smooth travel of the chuck jaws during tool insertion and tightening. When a jaw guide wears or becomes damaged, chuck performance degrades, leading to runout, inconsistent grip, and potential workpiece damage. This part restores factory-spec function to the chuck assembly and is installed by machinists, tool and die technicians, and industrial maintenance personnel performing chuck rebuilds or component-level repairs.
This jaw guide is intended for chuck rebuild and maintenance applications where the original guide has worn beyond serviceable condition. It fits into the chuck body alongside the jaw set and works in conjunction with the other internal chuck components to ensure consistent jaw movement. Typical install scenarios include production shop floor maintenance, tool crib repairs, and precision machining environments where chuck accuracy directly affects part quality.
Designed for use with JACOBS Chuck No. 160 keyless precision drill chucks. Model number reference: GS-160.
Chuck jaw guide replacement is typically performed by a machinist or qualified maintenance technician familiar with chuck disassembly procedures. Ensure the drill or power tool is fully disconnected from power and the chuck is removed from the spindle before beginning any internal service. Use appropriate chuck disassembly tools and follow the chuck manufacturer service documentation to avoid damage to the jaw set or chuck body during reassembly.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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