BOTTOM BRACKET TAPPING AND FACING SET PARK TOOL BTS-1

The Park Tool BTS-1 is the bottom bracket tapping and facing set designed to check and repair threaded bottom bracket shells. With the English taps and the facing cutter you bring the shell threads and faces back to the correct condition before installing the bottom bracket.

The heart of the system is the two-piece handle that passes through the bottom bracket shell: by connecting both sides, it keeps the right and left taps perfectly aligned with each other. The English taps check and restore thread alignment, and once threaded in they act as a guide for the cutter, so that the shell faces are machined square to the bottom bracket axis. Park Tool recommends using a cutting fluid, such as Park Tool CF-2, when machining.

How the BTS-1 bottom bracket set works

• The 692 left-hand tap works on the drive side of English-threaded shells, the 691 right-hand tap on the non-drive side.
• The two-piece handle passes through the shell and keeps both taps on axis while threading.
• With the taps in place, the 45 mm facing cutter (690) faces the shell using the taps themselves as a guide.
• The result is a shell with aligned threads and parallel faces, ready for bottom bracket installation.

Why choose Park Tool BTS-1

• Tapping and facing in a single coordinated set.
• Two-piece through-shell handle to keep both sides of the shell aligned.
• Faces machined square to the bottom bracket axis thanks to the tap guide.
• Expandable system: Park Tool offers as options the 693 Italian taps 36 mm x 24 TPI (two required), the 647R and 647L T47 taps (M47 x 1.0) and the 690-XL 57 mm oversized cutter.
• Replacement parts available for every component, from the 690, 690-XL and 690-XXL cutters to the 684S, 688 and 648R/648L facing guides.

For the workshop preparing new frames or rescuing bottom bracket shells with damaged threads, the Park Tool BTS-1 tapping and facing set is the foundation for a precise, reliable bottom bracket installation.