S-91571A292 3/4"-10 x 2 1/4" ASME B18.2.6, ASTM A325, ASTM F3125 Medium-Strength Steel Heavy Hex Head Screws for Structural Applications

Key Features & Benefits at a Glance

• Exceptional structural integrity with 120,000 psi tensile strength and Rockwell C19 hardness for reliable performance in demanding applications
• Optimized load distribution through partially threaded design with 7/8" grip length for superior clamping force and vibration resistance
• Quick installation and removal with external hex drive and 1 1/4" head width for easy tool access in confined spaces
• Precise thread engagement with Class 2A thread fit and UNC coarse threads ensuring consistent performance and reduced cross-threading risk
• Heavy-duty steel construction meeting Grade A325 specifications for structural applications requiring high strength-to-weight ratio
• Regulatory compliance assurance with RoHS 3 and REACH environmental standards for international project suitability
• Industry-standard compatibility adhering to ASME B18.2.6, ASTM A325, and ASTM F3125 specifications for reliable interchangeability

Professional Applications & Engineering Value

Engineered for structural steel connections and heavy machinery assembly, these Grade A325 hex head screws solve critical fastening challenges in construction and industrial applications. The partially threaded design concentrates strength where needed most, while the coarse UNC threads provide superior resistance to vibration loosening in dynamic load environments. The external hex drive configuration ensures high torque capability without stripping, making them ideal for structural bolting in bridge construction, building frameworks, and heavy equipment manufacturing. Their 120,000 psi tensile strength and Rockwell C19 hardness deliver reliable performance under extreme stress conditions, preventing joint failure in critical applications.

Specification Summary & Compliance

This 3/4"-10 UNC hex head screw features precise Class 2A thread fit tolerances and inch system measurements ensuring dimensional accuracy. Manufactured to meet ASME B18.2.6, ASTM A325, and ASTM F3125 specifications for structural fasteners. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, containing no substances of very high concern above threshold limits. The right-hand thread direction and coarse thread spacing provide industry-standard compatibility for North American structural applications.