S-91251A168 4-48 x 1" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 PSI for reliable performance in high-stress applications
• Precise Class 3A thread fit ensures superior engagement and vibration resistance in critical assemblies
• Black-oxide surface treatment provides corrosion resistance and enhanced durability in industrial environments
• High hardness rating (Rockwell C37) maintains thread integrity and prevents stripping during repeated use
• Fine UNF thread profile delivers better load distribution and improved clamping force control
• Partially threaded design allows for optimal grip length selection and prevents thread damage during installation
• Hex socket drive enables high-torque installation in confined spaces with standard industrial tools

Professional Applications & Engineering Value

This 4-48 UNF socket head cap screw delivers critical engineering advantages for precision machinery, aerospace components, and industrial equipment where high tensile strength and thread reliability are paramount. The black-oxide alloy steel construction provides superior corrosion resistance while maintaining dimensional stability under extreme loads. The Class 3A thread fit ensures minimal backlash and superior vibration resistance in dynamic applications, while the fine UNF thread profile offers enhanced clamping force distribution for sensitive assemblies. Engineered to prevent thread galling and stripping, this fastener solves common industrial challenges of thread failure and installation damage in high-performance applications.

Specification Summary & Compliance

Manufactured to ASTM A574 specifications with Class 3A thread fit precision and UNF fine thread standards. Features include 1" overall length with 3/4" minimum thread length, 3/32" hex drive, and right-hand thread direction. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for industrial use.