UNC thread plug gauge American standard UNF plug gage
Part NO: PG-202
UN = Unified National Fixed Pitch Series
UNC = Unified National Coarse Series
UNF = Unified National Fine Series
UNEF = Unified National Extra Fine Series
UNS = Unified National Special
Internal thread tolerance class: 1B,2B,3B;
UNC = Unified National Coarse Series
UNF = Unified National Fine Series
UNEF = Unified National Extra Fine Series
UNS = Unified National Special
Internal thread tolerance class: 1B,2B,3B;
External thread tolerance class: 1A,2A,3B