S-8077A834 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 chemical exposure
• Enhanced durability and wear resistance from the black oxide finish, providing long-lasting performance and reduced maintenance
• High load-bearing capacity with 70,000 psi tensile strength and 35,000 psi shear strength for demanding mechanical applications
• Precise alignment and smooth rotation thanks to the Class 3A thread fit and standard shoulder fit, minimizing play and vibration
• Secure, non-slip installation with the knurled socket head and 5/32" hex drive, allowing for high-torque tightening
• Reliable dimensional stability ensured by tight shoulder diameter and length tolerances for consistent assembly performance
• Broad regulatory compliance meeting ASME B18.3, RoHS 3, and REACH standards for safe, global industrial use

Professional Applications & Engineering Value

This 1/4-20 UNC thread shoulder screw is engineered to address critical challenges in precision machinery and heavy-duty equipment. The 316 stainless steel material offers exceptional resistance to corrosion and oxidation, making it suitable for marine, chemical processing, and outdoor applications where moisture and chemicals are present. The black oxide finish not only enhances aesthetic appeal but also adds a protective layer that reduces friction and wear during dynamic operations. With its Class 3A thread fit and precisely machined shoulder, this screw ensures accurate positioning and smooth rotational movement in assemblies like bearings, pulleys, and linkages, reducing misalignment and extending component life. The knurled socket head design allows for secure tool engagement, preventing cam-out in high-stress environments. Ideal for use in automotive, aerospace, and industrial automation, this shoulder screw delivers reliable performance under high tensile and shear loads, supporting efficient and maintenance-free operation.

Specification Summary & Compliance

This shoulder screw adheres to Class 3A thread fit for high precision and UNC coarse threading (1/4"-20) to facilitate quick assembly and disassembly. Manufacturing conforms to ASME B18.3 specifications, ensuring dimensional accuracy and interchangeability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing the absence of hazardous substances and supporting environmental and workplace safety standards.