S-8077A772 1/2"-13 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh environments and chemical exposure.
• Enhanced durability and wear resistance from the black oxide finish, providing added protection against rust and galling.
• High load-bearing capacity with 70,000 psi tensile strength and 35,000 psi shear strength for reliable performance in demanding applications.
• Precise thread engagement and reduced risk of cross-threading due to the Class 3A thread fit and coarse UNC thread spacing.
• Secure and non-slip installation with a knurled socket head and 5/16" hex drive, ensuring firm tool grip during tightening.
• Accurate alignment and spacing facilitated by the precisely machined shoulder with tight diameter and length tolerances.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and environmental responsibility.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical challenges in industrial settings, such as misalignment, vibration loosening, and corrosion-induced failure. The black oxide finish enhances surface hardness and provides an extra layer of protection, making it suitable for applications in machinery, automotive assemblies, and marine equipment where moisture and chemicals are prevalent. The coarse UNC thread and Class 3A fit ensure quick, secure fastening with minimal risk of stripping, while the knurled socket head allows for high-torque installation without slippage. Its robust shoulder design acts as a precise pivot or spacer, reducing wear on moving parts and extending the lifespan of assemblies. Ideal for use in precision instruments, conveyor systems, and heavy-duty rotating mechanisms, this screw delivers reliable performance under high stress and corrosive conditions.

Specification Summary & Compliance

This shoulder screw features a 1/2"-13 UNC thread with Class 3A fit for precise thread engagement and tolerance. The shoulder diameter is 5/8" with a tolerance of -0.004" to -0.002", and the shoulder length is 3/4" with a tolerance of -0.005" to 0.005", ensuring accurate alignment. Manufactured in compliance with ASME B18.3 specifications, it also meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, confirming its adherence to environmental and safety regulations.