JBO Thread Plug Gauge - UNC Go-No/Go - Right Hand - 3B - 1/4 x 20 4 Month Widin The through‑coolant design supports efficient

The through‑coolant design supports efficient cooling and chip management

Why this ER16 collet stands out

This reamer enables precise hole finishing with a tight ISO H5 tolerance and a consistent bore quality ideal for accurate assemblies

making it a trustworthy choice for shops that require consistent results across a range of materials and applications

while the left-hand spiral flute paired with right-hand cutting provides precise control during reaming

JBO Thread Plug Gauge - UNC Go-No/Go - Right Hand - 3B - 1/4 x 20 4 Month Widin The through‑coolant design supports efficientThe JBO Thread Plug Gauge is a precision UNC Go No Go tool designed to inspect threaded holes and female threaded components with speed and confidence. Sized for 1 4 x 20 right hand UNC threads and built to 3B tolerance, its a practical choice for manufacturers, automotive shops, and aerospace maintenance teams who need quick, repeatable checks against Unified thread standards. With its Go No Go design, inspectors can instantly confirm conformity or