Insize American Standard Thread Ring Gauge 1 1/4-8UN Class 2A GO Series 4121-1G58 4 Piece 1/4 DOT Straight Brass Push in Hose Connect Grab Kit Assortment ensuring superior thread quality and

ensuring superior thread quality and surface finish

ensuring a more secure repair for high-stress and high-wear applications

🔹 Shank Diameter: 3/4" – Compatible with a variety of rotary tools and handpieces

Satin chrome plated reading surface for durability

and thread accuracy in external applications

Insize American Standard Thread Ring Gauge 1 1/4-8UN Class 2A GO Series 4121-1G58 4 Piece 1/4 DOT Straight Brass Push in Hose Connect Grab Kit Assortment ensuring superior thread quality andThe Insize 4121 1G58 American Standard Thread Ring Gauge is a precision GO thread gauge designed for accurate inspection and verification of external Unified threads. Manufactured to ANSI ASME B1. 2 standards, this high precision ring gauge is ideal for machining, production inspection, and quality control applications requiring reliable thread checking. Designed for Class 2A thread inspection, the gauge ensures consistent verification of thread