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316 Stainless Steel Zinc Plated External Hexagonal Bolts A4-70 High Quality Anti-corrosion Anti-rust Fully Threaded with Nuts
This series features 316 stainless steel externally hexagonal bolts, finished with a zinc-plated surface and fully threaded shank. Engineered to A4-70 property class, these fasteners offer reliable corrosion resistance for demanding environments. The design ensures consistent clamping force, supporting secure assembly in food processing lines, marine equipment, and chemical plants. These bolts are supplied with matching nuts, delivering a complete and convenient fastening solution for B2B procurement needs.
- Overview
- Recommended Products
- 316 Stainless Steel: High corrosion resistance and durability.
- Fully Threaded Design: Ensures secure and reliable connections.
- Hexagonal Head: Easy to grip and tighten with tools.
- Zinc Plated Surface: Added protection against rust and corrosion.
- A4-70 Grade: Meets high-quality industrial standards.
Food Processing and Canning Machinery: In environments where hygiene and wash-downs are routine, the 316 stainless steel substrate offers resistance to the acidic nature of fruits, vegetables, and cleaning agents. The smooth threads help reduce product entrapment, which supports sanitation protocols. The zinc plating adds an extra margin of protection in wet areas.
Conveying Equipment: For systems moving bulk materials or packaged goods, the robust tensile strength of the A4-70 grade provides secure mounting for brackets, tracks, and gearboxes. The vibration resistance helps maintain alignment over extended operational hours. The full thread design allows for fine adjustment of component positions.
Medical Apparatus and Packaging Machinery: Equipment used in pharmaceutical or medical device assembly relies on stable, corrosion-free fittings. These bolts support the structural integrity of conveyor rails, sealing stations, and labeling units, where exposure to alcohols and mild disinfectants is common. The consistent thread form supports precise assembly tolerances.
Water Treatment and Chemical Equipment: Within water distribution networks and chemical dosing pumps, resistance to chlorine-based compounds and oxidizing agents is critical. The dual protection of 316 steel and zinc plating helps preserve the integrity of flanges, pipe supports, and valve mountings, extending service intervals in these demanding environments.
Marine Equipment and Ship Manufacturing: The saline atmosphere near coastlines and in marine vessels accelerates rusting. These bolts maintain their thread integrity in outdoor, salt-spray conditions, making them suitable for deck fittings, hatch covers, and bilge pump mounts. The 316 alloy is particularly valued for its performance in chloride-rich marine environments.
General Machine Parts: Across construction and agricultural machinery, these fasteners serve as reliable replacements. Their consistent hardness reduces the need for frequent replacement, supporting operational efficiency. The availability as a complete set with nuts simplifies field maintenance and repair work.
About Products
The externally hexagonal bolts in this range are manufactured from grade 316 austenitic stainless steel, a material selected for its enhanced resistance to pitting and crevice corrosion, particularly in environments containing chlorides or acidic residues. The choice of 316 stainless steel provides a durable base, while the subsequent zinc-plated surface treatment adds an extra functional layer. This dual-protection strategy serves to extend the service interval of the fastener in humid or chemically active settings, reducing the frequency of maintenance checks.
Each bolt follows a fully threaded configuration, meaning the thread run covers the complete shank length. This design choice is significant for applications requiring precise tensioning or where the bolt engages with a blind hole, as it maximizes thread engagement and distributes load more evenly across the joint. The hexagonal head geometry is standardized to facilitate efficient torque transfer using standard wrenches or sockets, minimizing the risk of rounding during high-torque installation. Meeting the A4-70 property class indicates that these bolts undergo a controlled manufacturing and hardening process, delivering a specified tensile strength suitable for structural connections. The A4 designation specifically refers to the 316 alloy composition, while the 70 indicates a minimum tensile strength of 700 MPa. The product is supplied in assembled sets with compatible nuts, ensuring thread fit and simplifying inventory management for industrial purchasers. The threads are formed through a rolling process, which enhances fatigue resistance and provides a smoother surface finish compared to cut threads.
Key Advantages
Application Scenarios
The versatility of these fasteners allows for wide deployment across core industrial sectors:
