1/4 X 19 BSP Helical Thread Insert Tap set of 2

Specification Set of 2 Rougher and finisher 1/4 - 19 BSP Use to produce threads for helical coil wire screw thread inserts only S.T.I. taps are oversized so the thread produced accepts a helical coil wire screw thread insert of the same nominal size and pitch Taps are marked with the nominal size and pitch of the bolt to be used Taps are marked with ?S.T.I." Part Number ES-12522

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