S-91257A699 7/16"-14 x 12" 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 150,000 psi tensile strength and Grade 8 classification, these screws withstand extreme mechanical stresses in demanding industrial environments.
• Superior Corrosion Protection - Zinc yellow-chromate plating provides enhanced rust resistance, extending service life in harsh conditions and outdoor applications.
• Optimized Thread Engagement - 7/16"-14 UNC coarse threads ensure faster installation and reduced cross-threading risks while maintaining secure connections.
• Precision Manufacturing Compliance - Manufactured to ASME B18.2.1 and SAE J429 standards, guaranteeing consistent quality and dimensional accuracy with Class 2A thread fit.
• Enhanced Drive Stability - External hex head design allows for high-torque application with standard tools, preventing stripping during installation.
• Strategic Partial Threading - 1-3/8" minimum thread length on a 12" shank provides optimal grip range while maintaining unthreaded section strength.
• Reliable Material Performance - Steel construction with Rockwell C33 hardness ensures durability against wear and deformation under heavy loads.

Professional Applications & Engineering Value

These Grade 8 hex head screws deliver critical performance where structural integrity is paramount. The 7/16"-14 UNC coarse thread configuration combined with partial threading creates an ideal balance between installation efficiency and shear strength, making them perfect for heavy machinery assembly, structural steel connections, and industrial equipment manufacturing. The zinc yellow-chromate plating actively resists corrosion in challenging environments, while the external hex drive accommodates high-torque applications without compromising fastener integrity. Engineers specify these 12-inch heavy-duty bolts for applications requiring reliable, long-lasting connections that maintain 150,000 psi tensile strength under sustained vibration and dynamic loading conditions.

Specification Summary & Compliance

Manufactured to precise Class 2A thread fit tolerances with UNC coarse threading (7/16"-14) and partial threading configuration. Complies with ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and mechanical properties. The zinc yellow-chromate plating meets industry standards for corrosion protection, while the Grade 8 classification ensures consistent 150,000 psi tensile strength and Rockwell C33 hardness across all fasteners.