S-97768A320 1/4"-20 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and black oxide finish, ideal for harsh industrial environments.
• High load-bearing capacity featuring 70,000 psi tensile strength and 35,000 psi shear strength for reliable performance in demanding applications.
• Precise alignment and smooth rotation ensured by the Class 3A thread fit and 1-1/2" shoulder length with tight tolerances.
• Easy installation and removal with a hex drive socket head and knurled texture for enhanced grip and torque application.
• Durable and wear-resistant due to Rockwell B55 hardness, maintaining integrity under repetitive use.
• Broad compatibility with UNC coarse threads and compliance to ASME B18.3 standards for seamless integration.
• Environmentally safe design meeting RoHS 3 and REACH regulations, ensuring no hazardous substances.

Professional Applications & Engineering Value

This 1/4-20 UNC shoulder screw is engineered to address critical alignment and durability challenges in machinery and equipment assembly. The 18-8 stainless steel material, enhanced by a black oxide finish, provides excellent corrosion resistance, reducing maintenance in humid or chemical-exposed settings. The coarse thread and Class 3A thread fit offer secure fastening with minimal risk of stripping, while the precise shoulder length and diameter tolerances ensure accurate positioning in pivots, gears, and linkages. Ideal for industrial applications like automotive jigs, conveyor systems, and precision instruments, this screw delivers consistent performance, minimizing downtime and enhancing operational efficiency.

Specification Summary & Compliance

This shoulder screw adheres to ASME B18.3 specifications, with a Class 3A thread fit for high precision and a shoulder diameter tolerance of -0.004" to -0.002". It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity.