product name: main bearing cover bolt
production information
specification: M10×1.25-5h
nominal length: 60
surface treatment: oiled after shot blasting
mechanical property level: ISO 898.1-12.9
material: SCM440 JIS G4053-2003
production process:
1.bolt can be made by cold-heading directly,
2.verticality of stem & head supporting surface should be within
0.05mm, bearing surface flatness should be within 0.05mm .once molding by cold heading, no cutting machining,100% detected by eddy current testing machine .
3.Shot blasting is adopted to wipe off the surface oxide skin, release the surface stress, no hydrogen brittleness, product can achieve good performance.
4.Hydrogen cleaning technology is adopted to clean the product surface after oil-plating, cleanness can achieve advance world standard.
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