6x40 UNF / NF Helical Thread Insert Tap 6-40

Specification 6.40" 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." 1/4x28 Part Number ES-12464

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