Import Astm A325 Type 1 Heavy Hex Structural Bolt — Buy in wholesale FOB from Supplier in China

Ningbo Steel Bolt Co., Ltd manufactures ASTM A325 Type 1 Heavy Hex Structural Bolts from stainless steel, carbon steel and alloy steel options with plain, zinc or black oxide finishes. The bolts are produced in Ningbo, Zhejiang with export through Shanghai or Ningbo port. Standard packaging combines cartons or plastic bags with palletized shipment for containerized freight. The supplier cites ISO standard conformance and a monthly supply capacity of 100,000 pieces, with payment by T/T transfer.

ASTM A325 Type 1 heavy hex structural bolts are quenched and tempered fasteners designed for steel-to-steel structural connections where specified minimum tensile strength must be guaranteed. The heavy hex head configuration provides approximately 20% greater bearing area than standard hex heads, distributing clamping force across wider joint surfaces and reducing risk of galling in high-tension assemblies. Material selection among carbon, alloy and stainless steels affects both mechanical performance and corrosion resistance: carbon steel achieves the highest strength-to-cost ratio but requires protective coating, while stainless grades (typically 304 or 316 for structural applications) sacrifice some strength for atmospheric corrosion immunity. Black oxide finish offers minimal corrosion protection but serves as an absorbent base for supplementary oil coatings and reduces light glare during installation.

Primary buyers include structural steel fabricators, pre-engineered metal building erectors, bridge contractors and heavy machinery OEMs requiring traceable fastener lots for quality assurance. The 100,000 piece monthly capacity suggests mid-scale production suited to project-based rather than commodity wholesale demand. Buyers should verify whether stock sizes are held for immediate shipment or whether all production is make-to-order, as this affects lead time planning for construction schedules.

Ningbo Steel Bolt Co., Ltd is located in Panjiashan, Xiepu Town, Zhenhai District, Ningbo, Zhejiang province, postal code 315200. The company holds a harbor trust tier with zero recorded response rate and zero average response hours on platform channels, indicating no active engagement through automated messaging. Their facility in the Zhenhai industrial zone positions them within Ningbo's established fastener manufacturing cluster, though no information is provided about factory age, employee count, or production floor area.

The supplier lists a brand name of Ningbo-bolt and offers structural bolts across three base material groups with multiple surface treatments. No quality management system certification (ISO 9001, IATF 16949) is mentioned, nor are export license details, major client references, or in-house testing capabilities disclosed. Buyers should conduct direct due diligence through factory visit or third-party audit to verify heat treatment facilities, thread rolling equipment, and dimensional inspection processes before committing to structural projects where bolt failure carries liability exposure.