S-8077A814 1/4"-20 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh industrial environments and chemical exposure.
• Enhanced durability and wear resistance from the black oxide finish, which also reduces light reflection and provides a sleek appearance.
• Precise alignment and secure fit thanks to the Class 3A thread fit and standard shoulder, minimizing assembly errors and improving joint integrity.
• High mechanical strength with 70,000 psi tensile and 35,000 psi shear strength, ensuring reliable performance under heavy loads and stress.
• Easy installation and removal using a standard 5/32" hex drive and knurled head, providing excellent grip and torque application.
• Broad compatibility with 1/4"-20 UNC coarse threads, making it suitable for a wide range of machinery and equipment.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety, quality, and environmental responsibility.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical challenges in industrial settings, such as corrosion, misalignment, and mechanical failure. The black oxide finish not only enhances corrosion resistance but also reduces galling and seizing in high-friction applications. With a Class 3A thread fit and precise shoulder diameter of 5/16", it ensures accurate positioning in assemblies like rotating shafts, pivots, and guides, reducing wear and maintenance costs. The coarse UNC thread and hex drive design facilitate quick installation in demanding environments, from automotive to marine equipment, where reliability and compliance with ASME B18.3 standards are paramount.

Specification Summary & Compliance

This shoulder screw features a Class 3A thread fit with UNC coarse threads, ensuring tight tolerances for secure fastening. The shoulder diameter is 5/16" with a tolerance of -0.004" to -0.002", and the shoulder length is 3 1/2" with a tolerance of -0.005" to 0.005", providing consistent precision. It complies with ASME B18.3 specifications for dimensional accuracy and is RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, meeting environmental and safety regulations for industrial use.