Can a fastener end user standardize on a single stainless steel fastener grade?
To achieve economies, some users standardize on a single stainless fastener grade – such as 302HQ (often without referencing a consensus standard such as ASTM F593). The problem is that more than one stainless grade may be needed to meet specific end use requirements. Food processing mixers, blenders, cookers, etc. are examples. Incorrect application could cause liability risk. Unfortunate example: Stainless Grades 303 and 302HQ were substituted for Grade 316L to assemble artificial human hearts. This material substitution compromised compatibility with the human body. Result: Screw heads “popped”. Yet, all fasteners were procured under “critical” application requirements requiring both lot and part traceability. Marine hose clamp example: Many marked “stainless steel” are actually low-grade stainless, and/or utilize plain steel screws. In underwater thru-hull boat fittings, the clamps could rust, precipitating water leaks. Test: if the clamp sticks to a magnet, it is not suitable for
