从Viet Nam供应商批发进口All Threaded Bolt — FOB条款

The All Threaded Bolt from Nakaumi Viet Nam Co., Ltd is a precision full-thread fastener manufactured from carbon steel grades SS400, S35C, and S45C, or alloy steel grades SCM435H and SCM440H, with thread coverage extending continuously from head to tip. Available in metric sizes M6 to M24 and Whitworth sizes W5/16 to W3/4, with lengths spanning 30mm to 4000mm to accommodate single-piece long bolting applications without couplers. Mechanical property classes 4.8 and 6.8 are offered, with the Blue-White Zinc Plated surface treatment providing corrosion resistance for indoor and protected outdoor environments. The product is manufactured at the company's facility in Phu My, within the B1 My Xuan industrial zone in Ba Ria-Vung Tau Province, with proximity to Cai Mep-Thi Vai deepwater port for export shipment.

Material selection between carbon and alloy steel grades determines the balance of cost, strength, and heat-treat response. SS400 is a general structural steel with moderate strength suitable for property class 4.8 bolts in static loading. S35C and S45C are medium carbon steels that can be through-hardened or induction-hardened to achieve higher strength levels. SCM435H and SCM440H are chromium-molybdenum alloy steels with superior hardenability, tensile strength, and fatigue resistance, specified where property class 6.8 or above is required. The Blue-White Zinc Plating designation refers to a trivalent chromium passivated zinc coating with a characteristic bright, slightly bluish finish, offering salt spray resistance typically 72-96 hours to white corrosion per ASTM B117, though this duration should be confirmed with the supplier for specific applications.

Primary applications span construction steel framing, machinery assembly, automotive component fastening, and industrial equipment manufacture where full-thread engagement is necessary for through-hole applications or where nut position must be adjustable along the entire bolt length. The extended 4000mm maximum length suits structural bolting in prefabricated building modules and conveyor systems. Buyers include construction material distributors, automotive tier suppliers, and industrial maintenance procurement. For procurement, verify thread pitch conformity to JIS B0205 (metric coarse) or BS 84 (Whitworth), tensile test certification per ISO 898-1, and coating thickness measurement per ISO 4042. Confirm whether the supplier provides batch traceability through material certificates, and whether dimensional inspection reports include thread pitch diameter measurement and straightness verification for longer lengths.

Nakaumi Viet Nam Co., Ltd operates from the B1 My Xuan Area in Phu My, Ba Ria-Vung Tau Province, Viet Nam, within an industrial zone developed for manufacturing and export-oriented production. The company's harbour trust tier classification indicates a verified business presence, though specific verification details are not disclosed in the listing. The location provides access to Cai Mep-Thi Vai international port, one of Southeast Asia's largest deepwater container terminals, facilitating direct ocean freight to major import markets. Response rate and average response time metrics are unavailable, so initial enquiry responsiveness should be evaluated as part of supplier qualification.

The supplier specialises in precision-engineered threaded fasteners with stated emphasis on quality assurance and fast delivery. No information is provided regarding year of establishment, factory floor area, employee count, annual production capacity, or existing client base. Buyers should request business registration documents, quality management system certification, and evidence of in-house manufacturing capability versus trading or subcontracted production. The material specification to JIS steel grades and the offering of both metric and Whitworth thread forms suggests technical familiarity with Japanese and British Commonwealth market requirements. Factory audit or video facility tour is recommended before committing to volume orders, with particular attention to thread rolling equipment capability, heat treatment furnaces for alloy grades, and plating line environmental compliance.