S-91263A455 M5 x 40 mm DIN 7991 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 170,000 PSI tensile strength for reliable performance in high-stress applications
• Superior corrosion resistance through zinc plating that extends service life in demanding industrial environments
• Precise installation control with 3mm hex drive design that prevents stripping and ensures secure fastening
• Optimized thread engagement through partially threaded M5 x 0.8mm coarse thread configuration for efficient assembly
• Maximum mechanical durability with Rockwell C39 hardness that maintains integrity under repeated stress
• Flush mounting capability with standard flat head profile that creates smooth surfaces in assembled components
• Industry-standard compatibility meeting DIN 7991 specifications for consistent performance across applications

Professional Applications & Engineering Value

These Class 12.9 flat head screws deliver critical engineering solutions where high tensile strength and corrosion resistance are paramount. The zinc-plated alloy steel construction provides superior protection against environmental degradation while maintaining Rockwell C39 hardness for long-term reliability. The M5 metric thread with 0.8mm coarse pitch ensures rapid installation in heavy machinery, automotive assemblies, and industrial equipment where vibration resistance is crucial. The partially threaded design concentrates strength where needed most, while the 3mm hex drive facilitates precise torque application without cam-out. These DIN 7991 compliant fasteners solve common industrial challenges including joint failure, corrosion-induced weakening, and installation inefficiency.

Specification Summary & Compliance

Manufactured to precise Class 5g6g thread fit tolerances ensuring consistent mating with standard metric nuts and threaded components. The 16mm minimum thread length provides optimal engagement depth for secure fastening. Full compliance with DIN 7991 manufacturing standards guarantees dimensional accuracy and performance reliability. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming these fasteners meet the latest environmental safety requirements for industrial use across global markets.