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Left‑hand spiral flute with right‑hand cutting: Efficient chip evacuation and a smooth finish
predictable hole sizes across demanding finishing tasks
Ideal for hobbyists and professionals alike
000 RPM: Maintains stability at speed
reducing variation and enabling reliable part interchangeability
VCOIL Plug Gauge (GO) - UNF (STI) - Heli Coil Gauge - Right Hand - 3B - 1.3/8 x 12 FHH Left‑hand spiral flute with right‑handPrecise GO plug gauge for UNF (STI) right hand threads, purpose built for Helicoil insert applications. Ideal for workshop and quality control environments that strictly follow ANSI ASME thread standards. Gauge Type: GO thread plug gauge used to verify that the thread cut in a part will screw in by hand without excessive force. Thread System: UNF (STI) Right Hand Thread Size: 1. 3 8 x 12 UNF Size Class: 3B Calibration & Standards: Manufactured to ANSI
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