4220-8.00TS BORDO CARBON STEEL TAP 8mm x 1.25mm SET

METRIC - Coarse & Fine Angle of thread is 60 deg The crest is flat and the thread has clearance at the root allowing external thread and internal thread to engage well. Larger root radius and lower thread height enable easy screw thread processing and increase thread screw strength. The major diameter of external thread and pitch are specified by a simple numerical value (most commonly measured in millimetres). BOTTOMING TAPS have a lead of two threads and are used to ensure minimum thread run-out when tapping to the bottom of a blind hole. Bottoming Taps are typically preceded by the use of a Taper or Intermediate Tap. INTERMEDIATE TAPS have a lead of four threads and are used in most general purpose applications to cut a thread true to a pre-drilled pilot hole. TAPER TAPS have a lead of eight threads and are used as a starting tap in difficult or high precision holes.

Diameter 8 mm Pitch 1.25 mm Lead Set Overall Length 70 mm Tapping Drill 6.9 mm

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