1/4"x26 BSF HSS L/H Taper Tap 4421J21 20 TPI UN internal pitch
Description
20 TPI UN internal pitch threading insert
THUNDERBIRD 1977-1979
Size 19 – For small part machining
Operating pressure (psi) 90
1/4"x26 BSF HSS L/H Taper Tap 4421J21 20 TPI UN internal pitchGoliath 1 4" BSF HSS L H Taper Tap For producing precision Left Hand threads by hand tapping, for starting threads either second or bottoming taps should used after to achieve desire thread depth.
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