S-92327A419 1"-8 x 4" ASME B18.2.1, SAE J429 Square Head Screws

Key Features & Benefits at a Glance

• Superior load-bearing capacity with 120,000 psi tensile strength for reliable performance in demanding applications
• Enhanced corrosion resistance through zinc yellow-chromate plating, extending service life in harsh environments
• Optimized installation efficiency with external square drive design providing maximum torque transmission
• Exceptional thread engagement through fully threaded 1"-8 UNC coarse spacing for superior holding power
• Consistent quality assurance meeting ASME B18.2.1 and SAE J429 specifications for industrial reliability
• Robust material performance with Rockwell C25 hardness ensuring durability under repeated stress
• Precision thread compatibility with Unified Standard Class 2A fit for secure fastening in coarse thread applications

Professional Applications & Engineering Value

This SAE Grade 5 square head screw delivers critical engineering solutions for heavy-duty industrial applications where vibration resistance and structural integrity are paramount. The combination of 120,000 psi tensile strength and Rockwell C25 hardness ensures reliable performance in construction equipment, machinery assembly, and structural frameworks subjected to dynamic loads. The fully threaded 1"-8 UNC coarse spacing provides maximum thread engagement throughout the 4" length, distributing stress evenly and preventing loosening in high-vibration environments. The zinc yellow-chromate plating offers superior corrosion protection, making these square head fasteners ideal for outdoor applications and harsh industrial settings where environmental factors would compromise ordinary fasteners. The external square drive design enables high-torque installation without cam-out issues, significantly reducing assembly time in production environments.

Specification Summary & Compliance

Manufactured to precise Unified Standard Class 2A thread tolerances with 1"-8 UNC coarse thread specifications, ensuring consistent fit and performance across industrial applications. These square head screws comply with ASME B18.2.1 dimensional standards and SAE J429 material specifications, guaranteeing interchangeability and reliability. The 4" length with full threading provides complete fastening capability, while the zinc yellow-chromate finish meets industry corrosion resistance requirements. All manufacturing processes adhere to quality standards suitable for industrial and construction applications where compliance with established engineering specifications is mandatory.