Makita 253739-6 Spare Part - LARGE HARD WASHER 4 6510SB/BO

Makita 253739-6 — Genuine Makita flat washer / spacer (Flat Washer 4)

Description:

A genuine Makita hardened flat washer (spacer) used in the pad/ backing-plate and bearing area of Makita random-orbit and finishing sanders. It provides the precise spacing and a hard bearing surface to keep the backing plate, bearings and housings aligned under clamping loads and vibration — helping restore smooth pad rotation and reduce vibration or noise. The part is listed as “Flat Washer 4,” i.e. intended for M4 (≈4.0 mm) fasteners, and is made to the same fit/shape used in the original assemblies.

Example models this part fits (representative):

BO5010, BO5012, BO5020, BO5021, BO5030, BO5031, BO5040, BO5041, BBO140, BBO180, DBO140, DBO180, M9204, MT924. (Compatibility shown in Makita parts listings and spare‑part diagrams referencing part no. 253739-6.)

Why this part matters:

- Restores correct spacing and preload in the pad/plate assembly so the sander runs true and bearings are protected.

- Genuine Makita part-numbered to match factory assemblies for drop‑in fit and reassembly.

Notes:

- Listed as “Flat Washer 4” (for an M4 fastening arrangement); outer diameter/thickness vary by application inside the tool — use the original washer as a visual/size check when replacing.

(Part references: Makita part number 253739-6 / alternative listing as 2537396 in parts catalogs.)

Jump straight to the Makita spare parts diagrams:

• Makita BBO140 Parts
• Makita BBO180 Parts
• Makita BO5010 Parts
• Makita BO5021 Parts
• Makita BO5030 Parts
• Makita BO5031 Parts
• Makita BO5040 Parts
• Makita BO5041 Parts
• Makita DBO180 Parts
• Makita M9204 Parts

Browse our full range of Makita sander parts.