S-94036A441 M8 x 40 mm ISO 898-1, DIN 6921 Medium-Strength Metric Class 8.8 Steel Flanged Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc yellow-chromate plating, extending service life in harsh industrial environments
• High tensile strength of 110,000 psi and Class 8.8 grade ensures reliable performance under heavy loads and vibration
• Enhanced load distribution thanks to the integrated flange design, reducing surface pressure and preventing loosening
• Precision threading with Class 6g fit provides smooth installation and secure fastening in coarse thread applications
• Durable Rockwell C22 hardness maintains structural integrity and resists wear during repeated use
• External hex drive design allows for easy installation with standard tools, improving assembly efficiency
• Partial threading offers optimal grip length for specific joint requirements while minimizing material usage

Professional Applications & Engineering Value

Engineered for demanding industrial applications, this M8 hex head screw combines Class 8.8 strength grade with a flanged design to solve common fastening challenges. The zinc yellow-chromate plated steel construction provides excellent corrosion resistance, making it ideal for machinery, automotive assemblies, and structural frameworks exposed to moisture or chemicals. Its coarse metric thread (M8 x 1.25) ensures quick assembly and reliable holding power in soft materials or where vibration resistance is critical. The partially threaded shank concentrates clamping force precisely where needed, while the flange distributes load over a wider area, preventing surface damage and maintaining joint integrity under dynamic stresses. This metric fastener delivers consistent performance in production lines, maintenance operations, and heavy-duty equipment where failure is not an option.

Specification Summary & Compliance

This hex head screw features M8 x 1.25 coarse metric thread with Class 6g thread fit tolerance, ensuring precise engagement. It complies with ISO 898-1 and DIN 6921 standards for mechanical properties and dimensions, guaranteeing interchangeability and reliability. The Class 8.8 strength grade is verified through Rockwell C22 hardness and 110,000 psi tensile strength testing. Manufacturing follows international specifications for flanged hex screws, with material and plating processes typically meeting RoHS and REACH environmental directives for safe industrial use.