SO-115 — 5th/Reverse Synchronizer Sleeve (B-series)

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SO-115 — 5th/Reverse Synchronizer Sleeve (B-series)

Description

The SO-115 is a 5th/Reverse synchronizer sleeve for Honda B-series manual gearboxes. Built from case-hardening alloy steel with ground sliding faces and optimized dog-tooth chamfers, it delivers quicker 5th engagement and quieter reverse meshing. Manufactured to OE geometry and tolerances for true drop-in rebuilds, proven for street and track use.

Specification

Material: SCM415 / SAE 8620 alloy case-hardening steel (or equivalent)

Heat Treatment: Carburized & quenched

Surface Hardness: HRC 58–62

Manufacturing: CNC turning/milling; dog-tooth forming with edge relief; precision-ground sliding & end faces