The Park Tool 647L Left Hand Threaded T47 Tap, click to enlarge

Item # 647L

/ Tools / Frame & Fork

Left Hand Threaded T47 Tap

The 647L is an M47 x 1.0 left-hand threaded tap designed for use with the BTS-1 Bottom Bracket Tapping Set to tap T47 bottom bracket shells. This tap is used on the drive side (right side) of the bike.

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647L Features

  • M47 x 1.0 left-hand threading
  • Sized for T47 bottom bracket shells

NOTE: Always use cutting fluid such as Park Tool CF-2 when machining.

Repair & Service

Compatible Products


Bottom Bracket Tapping & Facing Set

647L & 647R T47 Bottom Bracket Taps



Stay on the Cutting Edge

Use Park Tool Sharpening Services