Below is a group product of Screws.
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Material: SUS 410 Steel (made in Taiwan)
Heat-treatment Process: Light Quenching
Hardness: 700 HV
[Last Updated: 2009-07-27]
Standard: SAE J78
Material: SAE1022
Surface Hardness: HRc52--58
Core Hardness: HRc32--40
Finish: Zinc ...
[Last Updated: 2009-07-27]