Import A193 B7/B7m/8/8m Stud Bolt — Buy in Bulk from Supplier in China

Ningbo Sunsun International Co., Ltd. supplies ASTM A193 stud bolts in grades B7, B7M, B8, B8M and B16, plus ASTM A320 grades L7 and L7M, for pressure-boundary and elevated-temperature service. The product range covers diameters from M5 to M100 (10# to 4 inch) and lengths from 6 mm to 6000 mm. Materials include carbon steel, alloy steel and stainless steel, with surface treatments of zinc plate, black oxide, hot-dip galvanising, Dacromet, nickel-zinc, nickel and PTFE. The stated standard references are SH3404, HG20613, HG20634, DIN975, DIN267-T13 and the ASTM grades above.

ASTM A193 B7 is a chromium-molybdenum alloy steel bolt tempered and quenched for strength at temperatures up to 450 °C; B7M is the lower-strength variant with improved toughness and identical chemistry. B8 and B8M are 304 and 316 stainless grades respectively, for corrosive and cryogenic duties. B16 adds vanadium for service to 540 °C. Surface treatments vary in corrosion resistance: hot-dip zinc gives a thicker sacrificial layer than electro-zinc, while Dacromet and PTFE suit chemical-process environments. Standard packaging is 25 kg per carton, 36 cartons per pallet, though buyers should confirm pallet dimensions and gross weight with the supplier.

These stud bolts are used in oil and gas, petrochemical, power generation and shipbuilding. Typical buyers are flange fabricators, pressure-vessel constructors and maintenance contractors who need traceable material with mill test reports. The supplier lists no MOQ, price band or lead time in its data, so importers should request a formal quotation with Incoterms, mill certificates to EN 10204 3.1 or 3.2, and third-party inspection if required.

Ningbo Sunsun International Co., Ltd. is located at Building 17, No. 328 Tianhu Luotuo, Zhenhai District, Ningbo, Zhejiang, 315202, China. The company holds a harbor trust tier on the platform, with a response rate of 0.00 and no recorded average response hours. The listing offers stud bolts across a wide dimensional range and multiple international standards, suggesting stocking or mill-direct sourcing capability.

The supplier profile does not state year of establishment, registered capital, factory size, employee count, annual turnover, or named clients. No certifications such as ISO 9001, API or PED are mentioned. Buyers should therefore verify quality-system accreditation, material-traceability procedures, and inspection-test-plan compliance directly with Ningbo Sunsun International before placing an order.