12.9 Grade Black Zinc Plated Hex Head Bolts (DIN931 & DIN933)

Product Overview

12.9 grade high strength black zinc plated DIN933/DIN931 full thread & half thread hex head bolts are specially developed to cope with severe and high-load industrial working conditions. Combining outstanding mechanical strength, excellent anti-corrosion ability and accurate standard dimensions, they act as essential connecting fasteners widely used in mechanical assembly, building steel structures, automobile production and heavy industry fields. Featured with stable 12.9 grade super high strength, these bolts can bear extreme heavy loads and maintain permanent connection firmness. Adopting premium black zinc plated surface finish, they effectively block moisture and rust erosion, greatly extend service life while presenting neat appearance, perfectly fitting all projects with strict demands on both strength and anti-rust property.

Core Advantages

• Superior High Strength Performance: Available in 10.9 and 12.9 mainstream strength grades. Its tensile strength reaches above 1200MPa and yield strength exceeds 1100MPa, fully satisfying heavy equipment assembly and high-load structural connection demands.
• Excellent Anti-Corrosion Ability: Black zinc plated finish greatly upgrades overall rust-proof performance, running stably in humid areas and salt spray environments and effectively cutting down later maintenance frequency.
• Strict Standard Production: Fully manufactured in line with DIN933 and DIN931 international standards. Threads are precisely rolled and hex head size matches standard tools perfectly, making on-site installation simpler and more efficient.
• Extended Shank Practical Design: Optimized longer bolt body breaks the limit of common installation depth, ideal for deep hole assembly and special structure locking such as automobile chassis and engineering machinery parts.
• Rich Complete Specifications: Complete thread range from M4 to M50 and common lengths from 20mm to 75mm are in stock. It supports personalized selection and large-scale bulk purchasing freely.

Application Scenarios

• Automotive Industry: Firmly lock chassis parts, engine assemblies and transmission system core components to adapt to long-term driving vibration.
• Mechanical Equipment: Used for key structural fixing of machine tools, engineering machinery and all kinds of heavy-duty industrial facilities.
• Construction Engineering: Reliable connection for large steel frames, bridge frameworks, tower cranes and other high-strength building structures.
• New Energy Industry: Meet the fastening demands of large-scale wind power, nuclear power and energy equipment to ensure long-term safe and stable operation.

Technical Parameters

Packaging and Logistics

• Packaging Options: 1.25kg small bags and 50kg large bags, matched with cartons and industrial pallets. Custom logo and exclusive packaging are available with certain MOQ.
• Sales Mode: Sold by single piece for accurate quantity purchasing.
• Outer Packing Size: 38×28×13cm, suitable for international standard logistics delivery.
• Bulk Packing Weight: 25kg per unit, effectively saving your storage and transportation costs.

Quality & After-sales Support

• Whole-process Strict Inspection: Produced in accordance with formal ISO quality management system. Every production procedure is monitored and tested to make sure all bolts reach unified dimension and performance standards.
• Thoughtful After-sales Service: We provide 7/24 online professional technical support, quickly reply and solve all installation and product problems to guarantee smooth project progress.

Customization Services

We cater to diversified usage demands from different industries and provide multiple flexible customization solutions:

• Custom engraved brand logo
• Exclusive customized outer packaging
• Custom printed pattern design

(All customized services require minimum order quantity)

Our 12.9 grade high strength black zinc plated hex bolts deliver stable quality, durable performance and cost-effective price. No matter for small quantity trial order or large-volume bulk purchase, we always stick to strict production standards and considerate one-stop service to strongly back up your global projects.

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If you need standard high strength DIN hex bolts,

feel free to contact us and get your ideal quotation right away!