S-91247A527 1"-14 x 3 1/2" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Enhanced load distribution with 1"-14 extra fine threading for superior grip in precision applications
• High tensile strength of 120,000 psi ensures reliable performance under extreme mechanical stress
• Corrosion-resistant zinc plating extends service life in harsh industrial environments
• Grade 5 steel construction with Rockwell C25 hardness provides excellent durability and fatigue resistance
• Class 2A thread fit guarantees consistent assembly compatibility and reduced cross-threading risks
• External hex drive design allows for high-torque installation with standard tools
• Partial threading optimizes clamping force for joint stability in structural applications

Professional Applications & Engineering Value

This Grade 5 hex head screw is engineered to address critical fastening challenges in heavy machinery, automotive assemblies, and structural frameworks. The extra fine 1"-14 UNS thread delivers superior resistance to vibration loosening, while the zinc-plated steel construction combats corrosion in demanding environments. With partial threading concentrating clamping force precisely, it prevents joint failure in high-stress applications. Ideal for industrial equipment requiring Class 2A thread fit precision, this fastener ensures long-term reliability where external hex drive accessibility and 120,000 psi tensile strength are paramount for maintenance and safety.

Specification Summary & Compliance

Manufactured to ASME B18.2.1 and SAE J429 Grade 5 specifications with Class 2A thread fit tolerances. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Threading conforms to UNS extra fine standards with right-hand orientation and 2 1/4" minimum thread length.