1/4 28 UNEF 3B STI HELICOIL ROSCA TAPÓN MEDIDOR .25 GO NO GO P.D.'S = .2732 y .2754
1/4 - 28 UNEF - 3B STI HELICOIL. STI HELICOIL THREAD PLUG GAGE. ”Gage was protected very good. Will buy from you again.”. Thread Gages. plain Pin Plug Gages. NO GO P.D. plain Bore Ring Gages.