S-8077A133 3/4"-10 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.
• Exceptional mechanical strength with 70,000 psi tensile and 35,000 psi shear strength, ensuring reliable performance under high-stress conditions.
• Precision alignment and smooth rotation provided by the precisely machined shoulder with standard fit and controlled diameter tolerance.
• Enhanced grip and easy assembly from the knurled socket head and 1/2" hex drive, reducing slippage during installation.
• Durable, wear-resistant surface thanks to the black oxide finish, which also provides a sleek, professional appearance.
• Reliable, coarse-thread engagement with UNC Class 3A threads, offering faster assembly and reduced cross-threading risk.
• Broad regulatory compliance including ASME B18.3, RoHS 3, and REACH, ensuring quality and environmental safety for global supply chains.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical alignment and durability challenges in demanding applications. The precision shoulder with its controlled diameter and length tolerances ensures exact component positioning, eliminating misalignment in machinery, pivoting joints, and rotating assemblies. The UNC coarse thread and Class 3A fit provide robust, reliable fastening, while the black oxide finish on the corrosion-resistant 316 material significantly enhances longevity in moist or chemically aggressive environments. With a high tensile strength of 70,000 psi and Rockwell B79 hardness, it withstands heavy loads and repetitive motion, making it an ideal choice for industrial equipment, automotive fixtures, and conveyor systems where precision shoulder screws are essential for operational integrity and reduced maintenance.

Specification Summary & Compliance

This shoulder screw features a 3/4"-10 UNC coarse thread with a Class 3A thread fit for precision engagement. The shoulder diameter is 1" with a tolerance of -0.004" to -0.002", and the shoulder length is 3 3/4" 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) regulations, ensuring adherence to international quality and environmental standards.