S-94361A393 5/8"-18 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional strength and durability with alloy steel construction and 140,000 psi tensile strength for reliable performance in demanding applications
• Precise thread engagement and vibration resistance thanks to Class 3A UNF fine threads ensuring secure fastening in critical assemblies
• Superior corrosion protection from the black oxide finish, extending service life in harsh industrial environments
• Easy installation and removal with the knurled socket head and 3/8" hex drive, providing excellent grip and torque transmission
• Accurate alignment and spacing due to the 3/4" shoulder diameter with tight tolerances (-0.004" to -0.002") for consistent component positioning
• High hardness for wear resistance with Rockwell C32 rating, minimizing deformation under load and prolonging screw life
• Compliance with environmental regulations including RoHS 3 and REACH, ensuring safe use in global markets

Professional Applications & Engineering Value

This 5/8"-18 UNF shoulder screw is engineered to address critical challenges in industrial machinery, automation systems, and precision equipment. The alloy steel material combined with Rockwell C32 hardness provides exceptional resistance to shear forces and wear, making it ideal for high-stress applications like rotating shafts, linkages, and bearing mounts. The black oxide finish offers reliable corrosion protection, reducing maintenance needs in humid or abrasive settings. With its Class 3A thread fit and fine UNF threads, it ensures minimal backlash and secure fastening in assemblies requiring precise alignment. The knurled socket head and hex drive facilitate quick installation even in confined spaces, enhancing assembly efficiency while the 1 1/2" shoulder length provides stable support for moving parts, preventing misalignment and reducing downtime.

Specification Summary & Compliance

This shoulder screw features a Class 3A thread fit with UNF fine threads (5/8"-18) and right-hand direction, ensuring high precision in threaded connections. The shoulder diameter is 3/4" with a tolerance of -0.004" to -0.002", and the shoulder length is 1 1/2" with a tolerance of -0.005" to 0.005" for consistent performance. It complies with RoHS 3 (2015/863/EU) under exemption 6(a) for lead in steel and REACH (EC 1907/2006) regulations, meeting industry standards for safety and environmental responsibility.