VCOIL Plug Gauge (D/E) - UNC (STI) - Heli Coil Gauge - Right Hand - 2B - 3/4 x 10 ER Collet Chucks while the BS 328/4 specification

while the BS 328/4 specification underpins its suitability for demanding reaming tasks

it features a left-hand spiral flute with right-hand cutting for efficient material removal and a smooth finish

Right-hand thread: designed to match standard right-hand threaded fasteners

delivering reliable ISO H4 tolerance per DIN 8089

and complex contours where reach and precision matter

VCOIL Plug Gauge (D/E) - UNC (STI) - Heli Coil Gauge - Right Hand - 2B - 3/4 x 10 ER Collet Chucks while the BS 328/4 specificationA precision go no go plug gauge designed for UNC (STI) Helicoil inserts in the 3 4 x 10 size. Right handed and built to ANSI ASME thread standards, it provides reliable checks for quality control and assembly readiness. Thread size and orientation: 3 4 x 10 UNC, right hand threads (D E UNC STI) for Helicoil inserts Go No Go design: Combines go and no go ends in one gauge; go end threads in by hand without excessive force, no go end should not thread