8.8 Grade DIN 933/931 Black Oxide Hex Head Bolt

Product Description

8.8 Grade DIN 933/DIN 931 High Tensile Black Oxide Hex Head Bolt serves as a trustworthy industrial fastening solution. In modern industrial manufacturing and engineering construction, fastening quality directly decides equipment operational safety and overall structural stability. This series of bolts are well engineered for tough working environments, integrating high-grade raw materials, fine processing techniques and superior surface finishing, delivering steady and durable connecting solutions for diverse industrial application needs.

Core Advantages

• Stable 8.8 Grade High Tensile Strength: Made of qualified 8.8 grade carbon steel, it features tensile strength up to 800MPa and minimum yield strength of 640MPa. It effectively avoids loosening, bending and fracture under regular loads, fully satisfying standard high-strength fastening demands.
• Strict Standard Precision Machining: Manufactured in full compliance with German DIN standards, including DIN 933 full thread type and DIN 931 half thread type. Uniform and precise threads ensure smooth fitting with matched parts and greatly boost on-site installation efficiency.
• Strong Environmental Adaptability via Black Oxide Finish: The professional black oxide treatment forms a compact protective film on the surface, effectively boosting rust and oxidation resistance. It works steadily in humid and mildly corrosive surroundings and extends overall service life significantly.
• Wide Industry Compatibility: Widely applicable in building construction, mechanical fabrication, auto spare parts, railway infrastructure, power equipment and more, covering mainstream fastening demands across different fields.
• Easy Installation & Maintenance: Standard hex head design fits perfectly with universal wrenches and common installation tools. It simplifies assembly and disassembly work and cuts down manual working intensity effectively.

Application Scenarios

It performs excellently in large mechanical equipment assembly, bridge steel structure fixing and automotive chassis component fastening. Thanks to reliable high tensile performance, it can keep steady clamping force against frequent vibration, impact and changing working conditions, hence becoming an essential standard fastener for various industrial engineering projects.

Quality Assurance

We source raw materials from reliable production bases in Hebei, China. The whole production flow is carried out in accordance with ISO9001:2015 quality management system. Every procedure from material selection, forming processing to finished product inspection is under rigorous control, ensuring all goods fully meet international industrial standards and offer solid quality guarantee for your projects.

Product Overview

8.8 Grade DIN 933/DIN 931 black oxide hex head bolts are classic high-performance standard fasteners. Balancing outstanding mechanical strength, dependable anti-rust property and easy operation, they have become indispensable connecting core parts in construction, machinery, automobile and other industries, fully safeguarding daily equipment running safety.

Core Technical Parameters

Performance Highlights

1. Solid High-load Resistance: Standard 8.8 grade mechanical properties surpass ordinary common bolts, ideal for medium and high-load daily fastening scenes.
2. Accurate Standard Thread Design: DIN standard thread pitch and dimension reduce assembly friction, realizing tighter connection and longer-term stability.
3. Durable Surface Protection: Uniform black oxide layer resists daily oxidation, damp erosion and mild acid-base influence, suitable for both indoor and outdoor use.
4. User-friendly Structural Design: Simple hex head structure is easy to operate, helping clients shorten construction cycles and raise overall working productivity.

Detailed Application Fields

• Construction Industry: Fasten steel frames, bridge components and concrete auxiliary parts to strengthen overall structural firmness.
• Mechanical Manufacturing: Assemble machine tools and equipment frames, stable enough to resist long-term vibration and keep consistent fastening force.
• Automotive Sector: Fix vehicle chassis and engine auxiliary parts to adapt to complex driving environments and guarantee driving safety.
• Railway Engineering: Connect rail facilities and signal equipment, capable of enduring continuous vibration to maintain stable system operation.

Customization Service

We provide considerate personalized customization services to meet your unique procurement demands:

• Custom brand logo engraved on bolt surface
• Exclusive outer packaging design as required
• Custom special sizes and non-standard shapes

Quality Commitment

We stick to strict quality control throughout all production links following ISO9001:2015 regulations. All finished goods pass professional tensile test, salt spray test and dimensional inspection before delivery. You can rest assured about both product performance and long-term usage effect.

Choosing our 8.8 grade DIN standard black oxide hex bolts means choosing stable quality, reliable performance and efficient service.

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Reach out to us today to get professional solutions and favorable bulk order quotations!