Import Astm F1554 Gr55 Stud Bolts — Buy in wholesale FOB from Supplier in China

Ningbo Yongbiao International Business Co., Ltd supplies ASTM F1554 Grade 55 stud bolts manufactured from alloy steel with hot-dip galvanised (HDG) or plain finish, designed for heavy-duty structural anchoring applications in construction and infrastructure. These threaded rods with chamfered or rounded ends are available in sizes from 3 inches to 8 inches diameter, with yield strength of 55 ksi (380 MPa) as specified by the ASTM F1554 standard. The Grade 55 designation indicates a medium-strength carbon or alloy steel anchor bolt intended for concrete foundation applications where ductility and weldability are required alongside reliable load-bearing capacity.

The alloy steel composition for Grade 55 typically contains carbon, manganese and selected alloying elements to achieve the specified mechanical properties while maintaining weldability per AWS D1.1 structural welding code. Hot-dip galvanising provides a zinc coating of approximately 65-85 micrometres thickness per ASTM A153, delivering corrosion protection for outdoor and coastal environments where plain steel would deteriorate rapidly. The threaded portion must be over-tapped to accommodate zinc coating thickness, and the supplier's thread class and pitch diameter tolerances should be verified for proper nut fit. Alternative finishes such as mechanical galvanising or epoxy coating may be available for applications where hydrogen embrittlement from hot-dip galvanising is a concern.

These stud bolts anchor structural steel columns, light pole bases, traffic signal structures, machinery bases and bridge components to concrete foundations. Typical buyers include structural steel fabricators, construction contractors, infrastructure developers and original equipment manufacturers of poles and towers. The supplier offers standard carton packaging (36 x 24 x 16 cm or 36 x 24 x 12 cm) and standard Euro pallet dimensions (110 x 80 x 90 cm), suitable for containerised export from Ningbo port. Free samples are available for stocked items, with typical lead time of 7-15 working days subject to order quantity confirmation. Buyers should request the complete certificate of conformance and mill test reports to verify chemical composition and mechanical properties.

Ningbo Yongbiao International Business Co., Ltd operates from Jiulonghu Town, Zhenhai District, Ningbo, Zhejiang province, with shipment from Ningbo port. The company trades as 'NBMFG' brand and holds a 'harbor' trust tier classification. Response rate and average response hours both record zero, suggesting no enquiry history is logged or responses are not tracked through the platform. The supplier's product focus appears to be structural fasteners and hardware for international markets, with particular emphasis on ASTM-specified anchor bolts and studs.

The listing provides no information about manufacturing ownership (whether the company manufactures in-house or sources from partnered factories), production capacity, quality management certification, or export experience duration. The address places the company in Ningbo's Zhenhai district, an industrial area with significant fastener and metal products manufacturing activity. Buyers should independently verify the company's business registration, whether it operates as manufacturer or trading company, and its experience with ASTM fastener production and testing. The brand name 'NBMFG' should be confirmed as registered trademark and its market recognition assessed.