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true bores in a single pass where the geometry matters most
designed for professionals and shops that demand exact hole tolerances
ideal for developing smooth
5 mm flute length
Carbide construction provides excellent wear resistance and long tool life
JBO Thread Ring Gauge (GO) - UNC - Left Hand - 2A - No. 12 x 24 Boring Bar Blank true bores in a singleThe JBO Thread Ring Gauge (GO) for UNC Left Hand, 2A, No. 12 x 24 is a precision measurement tool designed to quickly and reliably verify external thread diameters. Its ideal for engineers, inspectors, machinists, and workshop technicians who need fast, confident go no go checks against UNC specifications. Crafted from hardened steel, this gauge resists wear and maintains accurate tolerances in demanding environments. Its GO design makes it easy to
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