Unified ends flat thread gauge gauges UNC UNF 1-72 2-56 2-64 4-40 4-48 6-40 8-36 10-32 12-28 Flat end Unified Fine Thread gage

Unified ends flat thread gauge gauges UNC UNF 1-72 2-56 2-64 4-40 4-48 6-40 8-36 10-32 12-28 Flat end Unified Fine Thread gage

Aliexpress UK