Butterfly nuts are increasingly diversified in materials, continuously improved in performance, and more widely used in the following eight areas: 1. Medical device industry (insulation, non-magnetic, environmental protection, anti-interference number, making the use...
for eight property classes of hex and hex-flange carbon and alloy steel. These nuts forgeneral structural and mechanicaluses onbolts, studs, andother externally threaded parts. Astm A563MMaterials shall be tested and the ...