The 647R is an M47 x 1.0 right-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 non-drive side (left side) of the bike.

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

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.

• 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.