S-8077A775 1/2"-13 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from 316 stainless steel and black oxide finish, ideal for harsh environments and extended service life
• High tensile and shear strength (70,000 psi and 35,000 psi respectively) ensures reliable performance in demanding, high-stress applications
• Precision Class 3A thread fit provides secure, vibration-resistant fastening with excellent dimensional accuracy
• Knurled socket head with 5/16" hex drive allows for easy installation and removal, even in tight spaces
• Sturdy shoulder design with precise diameter and length tolerances acts as a reliable pivot, bearing surface, or locator in assemblies
• Compliance with ASME B18.3, RoHS 3, and REACH guarantees quality, safety, and environmental standards are met for industrial use
• Coarse UNC thread enables quick assembly and disassembly, reducing installation time and labor costs

Professional Applications & Engineering Value

This black oxide 316 stainless steel shoulder screw is engineered to address critical challenges in industrial machinery, automotive systems, and high-stress assemblies. The Class 3A thread fit and coarse UNC thread ensure rapid, secure fastening that resists loosening under vibration, a common issue in dynamic equipment. The precision shoulder serves as an accurate spacer or axle, eliminating the need for additional components and reducing assembly complexity. Made from 316 stainless steel with a black oxide finish, it offers exceptional resistance to corrosion from chemicals, moisture, and salt spray, making it suitable for outdoor, marine, and chemical processing applications. Its high tensile strength and Rockwell B79 hardness provide durability under heavy loads, preventing failure and minimizing maintenance downtime in critical operations.

Specification Summary & Compliance

This shoulder screw features a 1/2"-13 UNC coarse thread with Class 3A thread fit for high precision. The shoulder diameter is 5/8" with a tolerance of -0.004" to -0.002", and shoulder length is 5/16" with a tolerance of -0.005" to 0.005". It meets ASME B18.3 specifications for dimensional and mechanical requirements. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring it is free from hazardous substances and safe for various industrial and international markets.