Import Astm A320 Stud Bolt — Buy in wholesale FOB from Supplier in China

ASTM A320 L7 and L7M stud bolts from Ningbo High Tensile Bolts Ltd. are alloy steel fasteners engineered for low-temperature and cryogenic applications, manufactured from chromium-molybdenum steel such as AISI 4140 or 4142. These double-ended threaded rods provide reliable performance in oil and gas pipelines, refinery flange connections, and pressure vessel assemblies, meeting ASME and ANSI bolting standards for critical joints. Available sizes range from 1/4 inch to 4 inches, and M6 to M100, with finishes including zinc, hot-dip galvanized, black oxide, Geomet, Dacromet, anodization, nickel plating, zinc-nickel plating, and PTFE coatings for enhanced corrosion resistance.

The material composition typically includes chromium and molybdenum to improve strength and toughness at sub-zero temperatures, a requirement for L7 and L7M grades under ASTM A320. Standard industry practice for these grades includes heat treatment to achieve the mechanical properties specified for low-temperature service, with typical tensile strengths exceeding 725 MPa and yield strengths above 550 MPa for L7. Surface treatments are applied post-fabrication to protect against environmental degradation in harsh industrial settings.

These stud bolts are primarily used in petrochemical plants, LNG terminals, and power generation facilities where consistent clamping force and resistance to brittle fracture are critical. Buyers sourcing from Ningbo High Tensile Bolts Ltd. should confirm thread engagement lengths, flange specifications, and compatibility with mating materials such as ASTM A105 or A350 flanges. Bulk shipments are typically packaged in wooden crates or pallets, with incoterms and payment terms negotiated per order. Lead times and minimum order quantities are supplier-specific and should be verified directly.

Ningbo High Tensile Bolts Ltd. is based in Zhenhai District, Ningbo, Zhejiang Province, China, with its registered address on Jiulong Avenue. The company specializes in the production and export of high-strength fasteners, including ASTM A320 stud bolts, for industrial applications requiring precision and durability. Its location in Ningbo, a major port city, facilitates efficient logistics for international shipments, particularly for buyers in the oil and gas, petrochemical, and power sectors.

The supplier’s profile indicates a focus on alloy steel fasteners, with a product range that includes customized specifications to meet client requirements for low-temperature and high-pressure environments. While the response rate and average response time are not currently available, the company’s harbor-tier trust status suggests a baseline level of reliability for trade inquiries. Buyers are advised to request updated verification details, including quality certifications and production capabilities, directly from the supplier before placing orders.