1-Material:SCM420 2-Convex surface treatment:Chrome-plated 3-Supplied to OEM and after market

Material: SCM420

Convex Surface Treatment: Chrome-plated

Convex Surface Roughness: ≤Ra0.2 mm

Convex Surface Hardness: HRC61-63

Depth of Hardened Layer: 0.5~0.8 mm

Verticality of Screw Thread in valve adjustment screw: ≤0.25 degree

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