S-8077A768 1/2"-13 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel and black oxide finish, ideal for harsh industrial environments
• High tensile and shear strength (70,000 psi tensile, 35,000 psi shear) ensures reliable performance under heavy loads
• Precise Class 3A thread fit with UNC coarse threads for secure, vibration-resistant fastening
• Easy installation and removal with 5/16" hex drive and knurled head for improved grip
• Accurate shoulder dimensions with tight tolerances for consistent alignment in assemblies
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH for safe, regulated use
• Durable construction with Rockwell B79 hardness for long-term wear resistance

Professional Applications & Engineering Value

This shoulder screw is engineered to address critical challenges in industrial fastening applications where precision and durability are paramount. The 316 stainless steel material, combined with a black oxide finish, provides exceptional resistance to corrosion, making it suitable for use in moist or chemically aggressive environments like marine, chemical processing, and outdoor machinery. The UNC coarse threads (1/2"-13) with Class 3A fit ensure quick assembly and reliable holding power, reducing the risk of loosening under vibration—common in automotive, aerospace, and heavy equipment. The knurled head and hex drive design facilitate easy handling with standard tools, speeding up maintenance and reducing downtime. Ideal for pivot points, rotating assemblies, and precision machinery, this screw delivers consistent performance and extended service life in demanding industrial applications.

Specification Summary & Compliance

This shoulder screw features precise dimensions, including a shoulder diameter of 5/8" with tolerance of -0.004" to -0.002", shoulder length of 2 1/8" with tolerance of -0.005" to 0.005", and thread length of 3/4". The thread fit adheres to Class 3A standards for high precision, and the UNC coarse thread type (1/2"-13) ensures compatibility with common industrial components. It is manufactured in compliance with ASME B18.3 specifications and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory adherence for global industrial use.