Thread Ring Gages

Sr. No Thread Type Size Range Standard
1 Metric M 1.0 to M 200 International Organisation for Standardization(ISO)
Basic Dimension : ISO:724-1978(E), ISO:9651-1980(E)
Gauging Practice : ISO:1502-1978 (E)
Indian Standard (IS)
Basic Dimension : IS4218 part III- 1976, IS4218 part IV-1976, IS 2334-1975
2 Unified ( UNC, UNF, UnEF, UNS, UN) No. 1-64 to 4” American Standard
Basic Dimension : ANSI ASME B1. 1-1982
Gauging Practice : ANSI ASME B2. 1-1982
Class of Fit : Plugs : 2B (Medium) Rings : 2A (Medium)
British Standard :
Basic Dimension : B.S. 1580 – 1962, Gauging practice : B.S. 919 Part I1960
3 Whit worth (BSW, BSF) 18” to 4” Basic Dimension : B.S. 84-1956