S-91251A325 1"-14 x 6" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance under extreme loads, reducing the risk of fastener failure in demanding applications.
• Corrosion-resistant black-oxide coating enhances durability and longevity, protecting against rust in harsh industrial environments.
• Precision Class 3A thread fit provides superior thread engagement and vibration resistance, minimizing loosening in critical assemblies.
• High hardness (Rockwell C37) offers excellent wear resistance, maintaining thread integrity and drive features through repeated use.
• Partially threaded design with fine UNRF threads allows for precise clamping force control and improved fatigue resistance in high-stress joints.
• 3/4" hex drive and standard socket head profile enable high-torque installation with common tools, speeding up assembly while preventing stripping.
• Compliance with ASTM A574, RoHS 3, and REACH ensures material consistency, environmental safety, and global regulatory acceptance for industrial supply chains.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, these black-oxide alloy steel socket head cap screws address critical challenges in machinery, automotive, and structural assemblies where vibration resistance and high clamp loads are paramount. The fine UNRF Class 3A threads deliver superior fatigue performance and precise alignment in tapped holes, reducing stress concentrations. The corrosion-resistant coating extends service life in humid or chemically exposed environments, while the partially threaded shank concentrates strength where needed, preventing thread damage during installation. Ideal for high-strength fastening solutions in presses, molds, and equipment frames, these screws combine 170,000 psi tensile strength with reliable hex drive compatibility for efficient maintenance and assembly.

Specification Summary & Compliance

This socket head cap screw features a 1"-14 UNRF fine thread with Class 3A fit for tight tolerance assemblies, a minimum thread length of 2-1/2", and overall length of 6". Manufactured from alloy steel per ASTM A574 specifications, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance for hazardous substance restrictions, ensuring suitability for global industrial and engineering projects requiring certified high-strength fasteners.