Import Astm A193 B7&Astm A194 2h Black Surface — Buy in Bulk from Supplier in China

Zhengzhou Huitong Pipe Fittings supplies ASTM A193 B7 bolts paired with ASTM A194 2H heavy hex nuts, both finished with a black surface treatment for corrosion resistance in high-temperature, high-pressure applications. The bolts are produced in metric and imperial sizes from M6 to M64 for bolts and M3 to M64 for nuts, with threaded rods available in lengths from 4 mm to 2000 mm. These fasteners conform to multiple international standards including DIN 931, DIN 933, DIN 934, ISO, ANSI/ASME, JIS and BS.

The material range covers carbon and alloy steels for ASTM A193 B7, while ASTM A194 2H nuts are typically manufactured from carbon steel, quenched and tempered to meet the required hardness. The supplier also offers an extensive inventory of stainless steel, duplex stainless, nickel alloy, monel, inconel, incoloy and hastelloy fasteners in grades such as 304, 316L, 2205, 2507, Monel 400, Inconel 625 and Hastelloy C276. Standard industry practice for black surface fasteners includes a protective oxide or phosphate coating to enhance durability in harsh environments.

These fasteners are used in petrochemical, power generation, oil and gas, and heavy machinery sectors where reliability under thermal and mechanical stress is critical. Buyers typically source them for boiler, pressure vessel, flange and structural connections that demand high tensile strength and resistance to vibration. Packaging is provided in plywood cases or wooden boxes to prevent damage during transit, with export markets including the United States, Germany, Saudi Arabia and South Korea.

Zhengzhou Huitong Pipe Fittings is based in Zhengzhou, Henan Province, China, with its office located at Room 2004, Expo Center, Dongfeng Road. The company operates as an importer tier supplier, specialising in a broad portfolio of fasteners including bolts, nuts, studs, screws, threaded rods, washers and gaskets. Its product catalogue spans multiple material categories, from standard stainless steels to high-performance nickel alloys, duplex stainless steels and specialty alloys like monel, inconel, incoloy and hastelloy.

The supplier’s listed response rate is currently at 0.00, indicating no recorded engagement via the platform’s messaging system. However, its export footprint covers major industrial markets such as the United States, Germany, Saudi Arabia and South Korea. The company does not provide verified details on production capacity, certifications or lead times, so buyers are advised to confirm these specifics directly before placing orders.