S-91268A122 1 1/8"-7 x 5" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional Load-Bearing Capacity – With a 150,000 psi tensile strength and Grade 8 classification, this screw withstands extreme mechanical stresses, reducing the risk of failure in heavy machinery and structural applications.
• Superior Durability & Wear Resistance – Rockwell C33 hardness ensures long-term performance under high vibration and load conditions, minimizing wear and maintenance needs.
• Reliable Thread Engagement – Coarse 1 1/8"-7 UNC threading with Class 2A fit provides secure fastening and easy installation, even in rough or debris-prone environments.
• Optimized for High-Torque Applications – The external hex drive and large 1 11/16" head width allow for efficient wrenching, speeding up assembly in industrial settings.
• Partial Threading for Precision Clamping – The 2 1/2" minimum thread length on a 5" screw offers focused grip strength, ideal for components requiring precise pressure distribution.
• Compliance with Rigorous Industry Standards – Meets ASME B18.2.1 and SAE J429 specifications, ensuring consistent quality and interchangeability in professional engineering projects.
• Environmentally Responsible Manufacturing – RoHS 3 and REACH compliance guarantees that the steel fastener is free from hazardous substances, supporting sustainable procurement practices.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, this Grade 8 hex head screw addresses critical challenges in construction, machinery assembly, and structural frameworks. Its high-strength steel construction and Rockwell C33 hardness resist deformation under dynamic loads, making it suitable for bolting large equipment, securing structural beams, or fastening in high-vibration environments like agricultural or mining machinery. The 1 1/8"-7 UNC coarse thread ensures rapid installation and reliable hold in materials where fine threads might clog or strip, while the partial threading design concentrates clamping force exactly where needed. By combining 150,000 psi tensile strength with standardized external hex drive compatibility, this fastener reduces assembly time and enhances safety in critical joints, delivering long-term reliability for engineers and procurement specialists.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, including Class 2A thread fit for consistent engagement and UNC coarse threading per ASME B18.2.1 and SAE J429 specifications. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety. The Grade 8 strength rating and documented 150,000 psi tensile strength confirm its suitability for high-stress applications, backed by industrial-grade steel material and rigorous quality controls.