JBO Thread Plug Gauge - UNS Go-No/Go - Right Hand - 2B - 1 1/2 x 8 Milling Cutter Arbors and a left-hand spiral flute

and a left-hand spiral flute with right-hand cutting for controlled material removal and a high‑quality finish

delivers reliable hole size control in 18

Non-overlapping slots with round-shank tooling: Longitudinal slots do not overlap at the center to minimize coolant loss

The combination of left-hand spiral flutes and right-hand cutting supports predictable chip control and smooth material removal

while the cobalt-containing HSS‑E composition sustains edge life for tougher materials

JBO Thread Plug Gauge - UNS Go-No/Go - Right Hand - 2B - 1 1/2 x 8 Milling Cutter Arbors and a left-hand spiral fluteThe JBO Thread Plug Gauge is a precision go no go tool designed to verify internal threads to UNS standards. Sized for 1 1 2 x 8 right hand threads with a 2B tolerance, this gauge is a must have for inspectors, machinists, and quality teams in manufacturing, automotive, and aerospace environments. Its compact, dual end design supports quick GO and NO GO checks in a single step, helping you confirm hole readiness on the shop floor and reduce rework or