
Carbon Steel Dacromet Coating Cup Oval Neck Bolt Railway Fish Bolts. Elliptic Neck Design: Non-circular shank prevents rotation, ensuring secure joints under extreme vibration. Wide Material Options: Available in Carbon Steel, Stainless Steel, and Duplex Steel. Multiple Plating Finishes: Offers Zinc, Dacromet, Geomet, and Hot Galvanizing for corrosion resistance. Comprehensive Grade Range: Stocks grades 4.8, 6.8, 8.8, 10.9, and 12.9 to meet diverse strength needs. OEM/ODM Capability: Accepts custom drawings and samples for special screws and bolts. ISO 9001 Certified: Manufacturing process certified to ISO 9001:2015 standards. Free Samples Available: Free samples provided for standard fasteners; new customers cover express cost. Global Shipping: Fast delivery from Ningbo and Shanghai ports to over 80 countries.