Makita 259041-5 Spare Part - PUSH NUT 8 BUC121/22/UC4020A
Makita 259041-5 — genuine Makita "Push Nut 8" (push-on retaining nut). This small, spring-steel push-on retainer is made to seat onto a drive shaft or stud and hold sprockets/assemblies in place on Makita chainsaw gear trains and similar assemblies. It’s listed as Push Nut 8 (intended for an 8 mm shaft) and sold as the replacement part number 259041-5.
Why it’s useful: the push-fit design provides a low-profile, one-sided retention that resists loosening from vibration but is quick to install during a repair—ideal when you need the exact Makita replacement to restore proper sprocket/shaft retention. The part is shown in Makita parts lists for chainsaw models, for example the cordless LXCU01 and corded UC/BUC series (UC4020A, UC1020A / BUC121 & BUC122), where it secures components in the drive/sprocket area.
What you’ll get: one original Makita push nut, part number 259041-5 (Push Nut 8). It’s compact, made to fit an 8 mm shaft, and intended to match factory fit and function so the chain/sprocket assembly sits correctly and runs without abnormal play.
Fit notes: examples of models that use this part include LXCU01 (Makita 18V cordless 4-1/2" chainsaw) and several UC/BUC electric chainsaw models (UC4020A, UC1020A, BUC121/122).
If your repair requires secure retention of a sprocket or shaft on a Makita chainsaw, this genuine Makita push nut (259041-5) is the direct replacement specified for those models and applications.
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Compatible models this part will fit:
