Hitachi 931-266 Spare Part - Brush Cap

931266 supersedes older part numbers: 931-266

Original Hitachi part 931266 — a molded brush cap designed to hold and protect the carbon brush and spring in the tool’s commutator assembly, keeping brush seating and electrical contact correct so the motor runs smoothly.

Fits a range of Hitachi/Hikoki small power tools and planers; example models commonly listed for this cap include P20SB, P20ST, RB40VA and WR16SA (it’s also referenced for G12SA and some C8FSE saws).

Sold individually under part number 931266 (also referenced as HKK931266 on some parts diagrams), the cap is a straightforward, hand-fit replacement — remove the old end cover, seat the brush and spring, then clip the new cap back in place.

If you’re looking for reliable Hitachi parts to restore consistent motor contact and reduce sparking, this small brush cap is an inexpensive, exact-match replacement. It’s one of those essential parts for power tools that often fixes intermittent running or excessive noise without any major disassembly.