Standard Reference (Nut): DIN, ASTM, (Gr2, Gr5, Gr8, 2H), AREMA
Rail Nut Standard Reference (Spring Washer): NF F50-001, AREMA, DIN, AS, UIC, JIS, GOST
Standard Reference (Flat Washer): EN10025, EN10139, ASTM F436, DIN125 / 433, GB / T1230, DIN5915, BS4395 / 3410,
Surface Treatment: Plain, Oxide Black, Zinc-Plated, Hot Dip Galvanized,etc.
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