Are Non-Standard Screws Magnetic?

Why do some non-standard screws stick to the magnet? Stainless steel tightening screws are non-magnetic and one of the biggest misunderstandings among screw users.

Non-standard screws are divided into three parts, namely size, mechanical properties and surface defects. The specific inspection items of each part have different regulations according to different products. Custom inspection method for non-standard screws: The inspection method for standard fasteners is specified in the technical conditions of the product. Professional standards have been developed for fastener testing methods (dimension and geometric accuracy).

Non-Standard Screws materials are divided into five categories: ferrite, austenite, martensite, duplex and precipitation hardening, only one is non-magnetic (austenite). Non-standard screws are divided into three parts, namely size, mechanical properties and surface defects. The specific inspection items of each part have different regulations according to different products.