SO-120A — 3rd/4th Synchronizer Sleeve (B-series LS)

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SO-120A — 3rd, 4th Synchronizer Sleeve Bseries LS

Description

The SO-120A is a 3rd/4th synchronizer sleeve for Honda B-series LS / Integra (B18A/B, B18B non-VTEC) gearboxes. Built from case-hardening alloy steel with optimized dog geometry and ground sliding faces, it delivers quick, positive 3–4 shifts and reduced gear-jump, while matching OE dimensions for true drop-in rebuilds.

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