S-91283A446 1 1/2"-6 x 4 1/2" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 100,000 psi tensile strength for reliable performance in demanding applications
• Superior torque transmission through the external hex drive design, ensuring secure installation and removal
• Enhanced durability and wear resistance thanks to Rockwell C19 hardness and Grade 5 steel construction
• Optimized for quick assembly with coarse UNC threading that reduces cross-threading risks in industrial settings
• Precision thread fit (Class 2A) provides consistent engagement and vibration resistance in machinery
• Full threading along the 4 1/2" length offers maximum grip and adjustability in thick materials
• Compliance with major industry standards including ASME B18.2.1 and SAE J429 ensures quality and interoperability

Professional Applications & Engineering Value

These Grade 5 hex head screws deliver critical engineering solutions where high tensile strength and reliable fastening are paramount. The coarse UNC thread design prevents stripping in soft materials and allows for rapid installation in production environments. Manufactured from hardened steel with Rockwell C19 hardness, these fasteners withstand repetitive stress in heavy machinery, construction equipment, and structural assemblies. The external hex drive accommodates standard wrenches for high-torque applications without slippage. Ideal for industrial maintenance, automotive framing, and equipment manufacturing, these fully threaded screws provide uniform clamping force across their entire 4 1/2" length, eliminating weak points in critical joints.

Specification Summary & Compliance

This 1 1/2"-6 UNC hex head screw features Class 2A thread fit tolerances per ASME standards, ensuring precise dimensional accuracy and interchangeability. The fastener meets ASME B18.2.1 and SAE J429 specifications for mechanical properties and dimensional requirements. Environmental compliance is confirmed through RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) certifications, guaranteeing restricted substance-free manufacturing. The right-hand coarse thread configuration follows unified inch system standards for consistent performance across industrial applications.