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53 mm diameter with ISO H4 tolerance provides consistent bore sizing
square shoulders on narrow ribs with minimal burrs
while a small corner radius (R0
and accurate profiles
Helix angle: 55° to optimize cutting action and reduce built-up edge in soft alloys
JBO Thread Plug Gauge (NoGo) - Metric Fine - Right Hand - 6H - M55 x 4 FLH 53 mm diameter with ISOThe JBO Thread Plug Gauge (NoGo) Metric Fine is a precision inspection tool designed to verify metric fine threaded holes with confidence. Aimed at engineers, machinists, quality inspectors, and shop crews, this NoGo gauge helps you quickly confirm whether a hole meets the required metric fine specification for reliability and proper assembly. Its specifically sized for M55 x 4, right hand threads, with 6H tolerance to ensure accurate gauging across
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