JBO Thread Ring Gauge (NoGo) - UNEF - Left Hand - 2A - 7/8 x 20 NCDC Drill Chuck The hollow-ground bore improves chip

The hollow-ground bore improves chip clearance and cooling

Its robust construction supports consistent measurements across shifts

and straightforward straight-shank design

and increasing confidence in thread integrity across assemblies

2B tolerance: Precisely matched to standard LH internal threads

JBO Thread Ring Gauge (NoGo) - UNEF - Left Hand - 2A - 7/8 x 20 NCDC Drill Chuck The hollow-ground bore improves chipThe JBO Thread Ring Gauge (NoGo) is a precision tool for verifying external UNEF threads on fasteners and machined parts. Specifically designed for left hand threads in the 7 8 x 20 size and class 2A, this gauge helps inspectors and machinists confirm that components meet Unified thread standards. Built for daily shop use, the NoGo design provides a clear pass fail indication, speeding up quality checks and reducing guesswork during assembly. Crafted