TRF421X Precision Spacer 3.0x4.0x2.7mm - Tamiya 9803571  [9803571]

High-precision 3.0x4.0x2.7mm spacer

The Tamiya 9803571 spacer is an RC hop-up made to deliver exact spacing in TRF421X assemblies. Listed with reference number 42391, it provides repeatable, small-step adjustments where tight tolerances matter, such as bearing seats, linkage pivots, and chassis mounting points.

Apply the spacer when correcting axial play, setting gear mesh clearance, or fine-tuning suspension geometry without altering major parts. Its nominal size of 3.0x4.0x2.7mm is ideal for compact spots commonly found on touring car chassis and precision hop-up work.

Installation is simple: confirm part orientation, slide the spacer onto the shaft or into the bore, and reassemble the sub-assembly. Take care not to over-constrain bearings or introduce binding in rotating parts; rotate by hand after fitting to check for free movement and correct preload.

For setup work, treat this spacer as one of several incremental options to tune handling. Small changes in spacer thickness or stack height can shift roll center, alter toe link geometry, and affect gear engagement, so record each change and test stepwise on track to evaluate cornering and drivetrain performance.