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Stainless steel hex cap screw markings
Inch
18-8 , which can be 302, 303 or 304 stainless, refers to 18% chromium and 8% nickel content.
316 is more corrosion resistant than 18-8 because it contains molybdenum, but in inch fasteners both have the same tensile strength.
Metric
A2 refers to metric 18-8.
A4 refers to metric 316.
Class 50, 70 and 80 designate increasingly higher metric strength levels.
A manufacturer's mark is required on metric M5 or larger diameters.
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