JBO Plug Gauge - UNF (STI) Heli Coil Gauge - Right Hand - 2B - 1/4 x 28 - Calibrated (DAkkS Calibration) Tiny Tool Inserts helping you achieve consistent bore

helping you achieve consistent bore diameters and better surface quality

spiral-flute finishing tool built from HSS-E and designed to bring drilled holes to ISO H4 tolerance with a fine surface finish

suitable for a variety of workholding needs

delivering steadier performance and a cleaner finish

The left-hand spiral flute paired with right-hand cutting delivers controlled

JBO Plug Gauge - UNF (STI) Heli Coil Gauge - Right Hand - 2B - 1/4 x 28 - Calibrated (DAkkS Calibration) Tiny Tool Inserts helping you achieve consistent boreThe JBO Plug Gauge for UNF (STI) is a precision measurement tool designed to verify UNF screw thread inserts (STIs) with a right hand orientation. Sized at 1 4 x 28 with a 2B tolerance, its an essential aid for QA labs, machine shops, automotive, and aerospace environments where accurate insert fit matters. Manufactured and assessed to ANSI ASME thread standards, this gauge delivers reliable checks on threaded inserts and is calibrated to DAkkS