S-8077A677 1/4"-28 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.
• Enhanced durability and wear resistance from the black oxide finish, providing added protection against abrasion and oxidation.
• High-strength performance with 70,000 psi tensile strength and 35,000 psi shear strength, ensuring reliable load-bearing in demanding applications.
• Precise thread engagement with Class 3A UNF fine threads, offering excellent vibration resistance and secure fastening.
• Easy installation and removal using the hex socket drive and knurled head, allowing for efficient tool access and handling.
• Accurate shoulder positioning with tight diameter and length tolerances, enabling consistent alignment in assemblies.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and environmental responsibility.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical challenges in precision machinery, automation systems, and heavy-duty equipment. The black oxide finish enhances corrosion resistance, reducing maintenance needs in humid or chemically aggressive settings. With a Class 3A UNF fine thread and 70,000 psi tensile strength, it provides secure, vibration-resistant fastening in high-stress applications like robotics, aerospace components, and industrial conveyors. The knurled head and hex socket drive facilitate quick assembly and disassembly, improving workflow efficiency. By meeting ASME B18.3 specifications, it ensures dimensional consistency and reliability, making it a trusted choice for engineers seeking durability and compliance in shoulder screw applications.

Specification Summary & Compliance

This shoulder screw features precise dimensions, including a 1/4"-28 UNF Class 3A thread with fine spacing for accurate fit. The shoulder diameter tolerance ranges from -0.004" to -0.002", and length tolerance from -0.005" to 0.005", ensuring high precision in assembly. It complies with ASME B18.3 manufacturing standards and is RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, confirming adherence to environmental and safety regulations for industrial use.