S-8077A793 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 extended service life.
• Enhanced durability and wear resistance from the Black Oxide finish, which also provides a sleek, non-reflective appearance.
• High-strength performance offering 70,000 psi tensile strength and 35,000 psi shear strength for reliable load-bearing in demanding applications.
• Precise alignment and smooth rotation enabled by the accurately machined shoulder with a 5/16" diameter and 3" length, reducing component wear.
• Secure and easy installation with a knurled socket head and 5/32" hex drive, ensuring a firm grip and reduced tool slippage during assembly.
• Consistent and reliable threading with Class 3A fit and 1/4"-20 UNC coarse thread, providing excellent engagement and vibration resistance.
• 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 not only enhances corrosion resistance but also minimizes galling and seizing in high-friction environments. Featuring a 1/4"-20 UNC thread with Class 3A fit, it ensures tight tolerances and reliable fastening in assemblies requiring exact alignment, such as pivots, bearings, and linkages. The knurled socket head and hex drive design allow for efficient installation in confined spaces, reducing assembly time and improving workflow efficiency. Ideal for industries like aerospace, automotive, and manufacturing, this shoulder screw delivers long-term reliability and performance under stress, making it a trusted choice for engineers seeking durable, compliant industrial fasteners.

Specification Summary & Compliance

This shoulder screw adheres to strict dimensional tolerances, including a Class 3A thread fit for superior precision and a shoulder diameter tolerance of -0.004" to -0.002". It conforms to ASME B18.3 standards for consistent quality and performance. Additionally, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity for global industrial use.