Jis B 0419-mk __hot__ < SIMPLE — 2025 >

Spool valves and body bores require controlled roughness to prevent leakage but do not demand profilometer control. JIS B 0419-mk 0.8S or 1.6S is common.

Engineers often confuse JIS B 0419-mk with other JIS standards. Here’s a quick differentiation: jis b 0419-mk

Japanese OEMs (Toyota, Honda, Nissan, Yamaha) often specify JIS B 0419-mk for machined non-critical mating surfaces like: Spool valves and body bores require controlled roughness