Tru-Thread 1/2 x 13 UNC STI 3B Left Handed GO/NOGO LH Screw Plug Gauge

This 1/2 x 13 UNC STI 3B Left Handed GO/NOGO LH Screw Plug Gauge is made to BS 4377:1991 and DIN 8140-1:1999. Built for accuracy and long service life, it provides a fast, reliable check of left handed threads in production, inspection and quality control environments.

STI (Screw Thread Insert) gauges are also known as EG, Heli-Coil or wire thread insert gauges. They are used to check oversize tapped holes prepared for wire thread inserts, ensuring the insert fits correctly and provides a standard size thread once installed.

Heli-Coil is a registered trademark of Emhart Teknologies and is referenced for identification purposes only.

Each gauge is supplied with a free ISO 17025 traceable calibration certificate.
UKAS calibration is available as an optional extra.

More than 8,000 gauges available on a 7 day lead time.

Gauges can be made to different specifications on request. Contact us with your requirements for a quotation.