S-8077A398 10-32 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 extended service life.
• Enhanced durability and wear resistance from the Black Oxide finish, providing a protective layer against abrasion and galling.
• Precise alignment and smooth rotation ensured by the Class 3A thread fit and standard shoulder, minimizing play in assembled components.
• High-strength performance with 70,000 psi tensile strength and 35,000 psi minimum shear strength, reliably handling heavy loads.
• Secure, slip-resistant installation using the hex socket drive and knurled head for improved grip during torque application.
• Broad compliance and reliability meeting ASME B18.3 standards, RoHS 3, and REACH regulations for quality and environmental safety.
• Fine UNF 10-32 thread design offers excellent holding power and vibration resistance in precision assemblies.

Professional Applications & Engineering Value

This 316 Stainless Steel Shoulder Screw is engineered to address critical challenges in precision machinery, automation systems, and corrosive environments. The combination of UNF 10-32 fine threads and a Class 3A thread fit ensures tight tolerances and reliable fastening in applications requiring minimal backlash, such as rotating shafts, pivots, and guides. The Black Oxide finish enhances surface hardness and reduces friction, preventing seizing and wear during repeated adjustments. With a 70,000 psi tensile strength and corrosion-resistant 316 stainless steel material, it delivers long-term performance in demanding conditions like chemical processing, marine equipment, and outdoor machinery, reducing maintenance needs and downtime.

Specification Summary & Compliance

This shoulder screw adheres to ASME B18.3 specifications, with a Class 3A thread fit for high precision. Key dimensional tolerances include a shoulder diameter of 1/4" (tolerance: -0.004" to -0.002") and shoulder length of 5/16" (tolerance: -0.005" to 0.005"). It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions are met for industrial use.