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A For Class 2A threads with coating (plating) the max is increased by the allowance, to the basic size This is the same value as Class 3A b For uncoated hotrolled, but not standard fasteners with cold rolled threads1/4 UNC 2A THREAD RING GAGES 25 GO NO GO PD'S = 2164 & 2127 1/4 TOOL $2999 Free shipping Last one Picture Information Image not available Mouse over to ZoomClick to enlarge Move over photo to zoom X Have one to sell?The following suggested tightening torques provide an excellent starting point for determining torque requirements Remember, you may need to vary these numbers somewhat based on the individual joint or the amount of fastener lubrication 1 4 Unc 2a Hilo Set Thread Plug Gage 25 Go Only P D 2164 250 U N C 2 A Amazon Com Industrial Scientific 1/4-20 unc-2b vs 2a