JBO Thread Ring Gauge (GO) - Metric Coarse - Right Hand - 4h - M30 x 3.5 Milling Cutter Arbors while the left‑hand spiral flute

while the left‑hand spiral flute supports efficient swarf removal and stable hole finishes

The combination of cobalt-enhanced steel and a spiral flute design supports consistent finishes

delivering dependable performance across a range of materials and applications

while the stub length and straight shank support stability and axis control during finishing operations

Left-hand spiral flute with right-hand cutting: Optimizes chip evacuation and cutting action for smoother finishes and predictable performance in typical reaming setups

JBO Thread Ring Gauge (GO) - Metric Coarse - Right Hand - 4h - M30 x 3.5 Milling Cutter Arbors while the left‑hand spiral fluteThe JBO Thread Ring Gauge (GO) Metric Coarse Right Hand 4h M30 x 3. 5 is a precision inspection tool designed to quickly verify external threads on metric coarse components. It helps engineers, inspectors, and shop floor teams confirm that parts will mate reliably with standard M30 x 3. 5 fasteners. Made from hardened steel for lasting durability, this GO gauge resists wear in demanding environments. The knurled outer ring provides a secure grip for