JBO Thread Plug Gauge - UNC Go-No/Go - Left Hand - 2B - No. 4 x 40 FHH while the straight shank and

while the straight shank and standard holder compatibility simplify setup and workflow across CNC and manual machines

The straight shank and precise spiral flute geometry support steady hand operation

Tight Diameter Tolerance: Maintains consistent cavity widths and slot depths with a precise +0 / -0

while the order-to-delivery model ensures you receive a tool built to Toolex quality with a predictable lead time

Built in high-speed steel (M2)

JBO Thread Plug Gauge - UNC Go-No/Go - Left Hand - 2B - No. 4 x 40 FHH while the straight shank andThe JBO Thread Plug Gauge is a precision tool for verifying No. 4 x 40 (4 40) left hand UNC threads. Designed for inspectors, machinists, and technicians across manufacturing, automotive, and aerospace environments, it helps ensure threaded holes and mating parts conform to Unified thread standards with speed and accuracy. Featuring a 2B tolerance grade and a robust go no go design, this gauge delivers fast pass fail checks, reduces inspection