JBO Thread Ring Gauge (GO) - UNF - Left Hand - 2A - No. 4 x 48 RPTECH while the left‑hand flute orientation

while the left‑hand flute orientation aids chip evacuation and creates smoother surface finishes when paired with right‑hand cutting

The secure taper shank

Through coolant design: enables effective cooling and chip flushing during reaming

80 mm diameter and standard HSS (M2) construction

accurate milling of graphite parts

JBO Thread Ring Gauge (GO) - UNF - Left Hand - 2A - No. 4 x 48 RPTECH while the left‑hand flute orientationThe JBO Thread Ring Gauge (GO) UNF Left Hand 2A No. 4 x 48 is a purpose built go gauge designed to verify external UNF lefthand threads. It helps machinists, inspectors, and quality teams quickly determine whether a threaded component meets the required minimum diameter, making QC checks straightforward and reliable. Crafted from hardened steel, this gauge offers exceptional wear resistance and long term durability in busy workshop environments. The