JBO Thread Ring Gauge (NoGo) - UNJC - Right Hand - 3B - 5/16 x 18 S&E Left-hand spiral flute with right-hand

Left-hand spiral flute with right-hand cutting: delivers stable

and aerospace inspection environments where accurate

and it’s manufactured to DIN 8051 B tolerance (D = ISO H5) for tight

reliable checks of threaded holes to ensure optimal fit and performance in assemblies

it excels in tight cavities

JBO Thread Ring Gauge (NoGo) - UNJC - Right Hand - 3B - 5/16 x 18 S&E Left-hand spiral flute with right-handThe JBO Thread Ring Gauge (NoGo) for UNJC, Right Hand, 3B, 5 16 x 18 is a precision inspection tool designed to quickly verify external thread diameters against the Unified standard. Built for manufacturers, machine shops, automotive, aerospace, and maintenance teams, it helps inspectors confirm whether a threaded part will fit correctly on the first try. The rings knurled outer edge provides a secure grip for frequent use in busy work environments.