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Black Oxide Hex Head Bolts – High-Strength Industrial Fasteners
May 16,2026
Author:
Hua Yue
These high-strength, black-finished external hexagon bolts are manufactured from premium carbon or alloy steel. Heat-treated to Grade 8.8, 10.9, or 12.9 specifications, they feature a uniform black oxide surface finish that offers excellent rust resistance and wear durability. With precision-cut threads and stable torque performance, these bolts comply with international DIN, ISO, and ANSI standards. Available in both full-thread and partial-thread configurations, they are ideally suited for heavy-duty fastening applications across the automotive, machinery, construction, and industrial equipment sectors. We offer bulk supply with a comprehensive range of available specifications.
Black Oxide Hex Head Bolts – High-Strength Industrial Fasteners
Product Overview
Our black oxide hex bolts are precision-manufactured to meet DIN933, ISO 4014 and ANSI B18.2.1 international standards. Featuring a uniform black oxide finish for basic corrosion resistance, anti-galling lubricity and a sleek matte black appearance. Made from high-grade carbon or alloy steel, heat-treated to Grade 8.8, 10.9 or 12.9 for exceptional tensile strength and load-bearing capacity. Unlike inferior coatings, black oxide adds negligible thickness, preserving precise thread tolerances for perfect fit and consistent torque. Designed for reliable, long-lasting fastening in machinery, automotive, construction and general industrial assemblies.
Key Features
- Premium Material: High-strength carbon steel (Grade 8.8) / 35CrMo alloy steel (Grade 10.9/12.9) for maximum durability.
- Black Oxide Finish: Uniform matte black coating, mild corrosion resistance, reduces friction during installation.
- Precision Threads: Clean, accurate metric/UNC threads, Class 6g tolerance, secure engagement, vibration-resistant.
- High Tensile Strength: Heat-treated to Grade 8.8/10.9/129, suitable for heavy-duty, high-stress applications.
- Standard Compliance: Fully conforms to DIN933, ISO 4014, ANSI B18.2.1, RoHS certified.
- Full/Partial Thread: Available in full thread (DIN933) and partial thread (DIN931) configurations.
Common Applications
- Automotive chassis & engine assembly
- Construction structural connections
- Industrial machinery & equipment
- Furniture fabrication & metalworking
- Heavy-duty mechanical engineering
- General industrial maintenance & repair
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