S-8077A367 8-32 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction, ideal for harsh environments and extended service life.
• Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for demanding, high-stress applications.
• Precision Class 3A thread fit ensures reliable, secure fastening with minimal risk of loosening or failure.
• Durable Black Oxide finish enhances wear resistance and provides a sleek, low-reflectivity surface.
• Convenient hex socket drive allows for easy installation and removal with standard tools, even in confined spaces.
• Knurled head texture improves grip during manual handling, reducing slippage and installation errors.
• Full compliance with ASME B18.3, RoHS 3, and REACH guarantees quality, safety, and environmental standards are met.

Professional Applications & Engineering Value

This 8-32 UNC thread shoulder screw is engineered to address critical challenges in precision assembly and machinery. The 316 Stainless Steel material provides outstanding resistance to corrosion from chemicals, saltwater, and industrial atmospheres, making it suitable for marine, chemical processing, and food-grade equipment. The Black Oxide finish not only adds an extra layer of protection against abrasion but also reduces galling during tightening. With its Class 3A thread fit and robust 70,000 psi tensile strength, this screw ensures reliable performance in high-vibration environments, such as robotics, automotive jigs, and conveyor systems, where joint integrity is paramount. The shoulder diameter acts as a precise pivot or spacer, eliminating the need for additional bushings and simplifying assembly in precision mechanisms.

Specification Summary & Compliance

This shoulder screw features a Class 3A thread fit for high precision, with UNC coarse threads (8-32 size) and a right-hand direction. The shoulder diameter is 1/4" with a tight tolerance of -0.004" to -0.002", and the shoulder length is 3/16" with a tolerance of -0.005" to 0.005". It is manufactured in accordance with ASME B18.3 specifications and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring it is free from hazardous substances and safe for various industrial applications.