Import Astm A307 Grade A Hex Bolt — Buy in wholesale FOB from Supplier in China

ASTM A307 Grade A Hex Bolt from Ningbo Steel Bolt Co., Ltd is a standard carbon steel fastener manufactured to ASTM A307 Grade A mechanical requirements, with a minimum tensile strength of 60,000 psi and typical proof load stress of 33,000 psi. These hex head bolts feature unified coarse thread (UNC) as standard, with diameters ranging from 1/4 inch to 4 inches and lengths up to several times the diameter depending on stocking. The Grade A designation specifies a lower strength carbon steel suitable for general applications, as distinct from Grade B which demands higher tensile properties.

The material composition is low to medium carbon steel, typically AISI 1018 or equivalent, with carbon content around 0.18% to 0.23% being standard for this grade. Surface finishes available include plain (as-rolled or pickled), zinc electroplated per ASTM B633, or black oxide conversion coating for moderate corrosion resistance. Thread fit is typically 2A for external threads, with hex head dimensions conforming to ASME B18.2.1 for width across flats and head height. The bolts are supplied in cartons or plastic bags on wooden pallets, with Shanghai or Ningbo port shipment options.

Buyers in structural steel fabrication, general construction, and industrial maintenance procure ASTM A307 Grade A bolts for non-critical connections where savings over high-strength alternatives justify the lower pretension capacity. Typical applications include wood-to-wood fastening, secondary steel connections, and machinery guards where vibration loosening is not a primary concern. Import buyers should confirm thread pitch requirements, needed surface finish for the intended exposure environment, and whether supplemental testing or certification to ASTM A307/A307M is required for their market.

Ningbo Steel Bolt Co., Ltd operates from Panjiashan, Xiepu Town, Zhenhai District, Ningbo, Zhejiang Province, China, postal code 315200. The supplier holds a harbor trust tier classification. Response rate and average response time data are both reported at zero, indicating no response history is recorded or the supplier has not engaged with enquiries through tracked channels. No verified certifications, factory audit results, or third-party accreditation details appear in the available profile information.

The listing presents ASTM A307 Grade A hex bolts as a core carbon steel fastener line, with material options spanning carbon steel, stainless steel, and alloy steel across the broader catalogue. Payment terms are listed as T/T (telegraphic transfer). The supplier quotes supply capacity at 100,000 pieces per month. Buyers should independently verify production capabilities, quality management system certification, and request material test certificates or third-party inspection reports before relying on specifications for critical applications.