Original Makita spring washer JM23100015 — a small, heavy‑duty spring (split) washer used to keep fasteners preloaded and prevent loosening in sliding compound mitre saw assemblies. This original Makita part is sold under part number JM23100015 and is listed specifically as "Spring Washer 4" for Makita saws.

Fits/compatible example models: Makita LS1018 (and LS1018L variants) and several 216–260 mm slide compound mitre saw models such as LS0815F, LS0816 and LS1110, where it secures rotating or pivot hardware in the upper assembly. Use these example model matches to confirm fit for your tool before installation.

Why this part matters: the JM23100015 spring washer restores the correct clamp/tension at a pivot or screw location so blades and fences stay tight and indexed under load — a simple, low‑cost replacement that prevents wobble and uneven cuts. Keep in mind this is a genuine Makita component intended for maintenance or repair of your saw; it’s a common small part listed among Makita parts for service kits and repairs.

This is a direct replacement washer — check the part number stamped on your parts diagram or the exploded view for your model to confirm compatibility before fitting. Small replacement items like this are typical parts for power tools maintenance and can be swapped quickly with basic hand tools.