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ASTM A193 B7 B7m B8 B8m Stud Bolt. Wide Size Range: Available in sizes from M12 to M90 and 1/2 inch to 3 1/2 inch. Multiple Finishes: Options include Black, Xylan, YZP, Darcomet, and HDG. OEM/ODM Services: Accepts custom OEM and ODM orders for fasteners. Free Samples: Free samples available for standard fasteners; express charges may apply. Quality Certification: ISO9001 certified manufacturer with MTC and mill certificates provided. High Strength Material: Manufactured from High Strength Steel grades B7, B7m, B8, and B8m. Factory Direct: Direct manufacturer based in Ningbo, China with over 25 years experience. Flexible Delivery: Delivery time typically 30 to 45 days, adjustable based on quantity.