S-8077A858 1/4"-28 ASME B18.3 Shoulder Screws
Shoulder Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior corrosion resistance with 316 stainless steel construction and black oxide finish, ideal for harsh industrial environments
- Precise component alignment ensured by the 1 1/2" shoulder length with tight tolerances for reliable assembly
- High-strength performance delivering 70,000 psi tensile strength and 35,000 psi shear strength for heavy-duty applications
- Exceptional thread accuracy with Class 3A UNF fine threads providing secure, vibration-resistant fastening
- Easy installation and removal using the 5/32" hex drive socket head with knurled texture for improved grip
- Enhanced durability from Rockwell B79 hardness, resisting wear and deformation under load
- Regulatory compliance meeting ASME B18.3, RoHS 3, and REACH standards for safe, global use
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw with black oxide finish is engineered to address critical challenges in precision machinery, automation systems, and industrial equipment. The 1/4"-28 UNF fine threads with Class 3A fit provide superior resistance to loosening under vibration, while the 1 1/2" shoulder length ensures accurate positioning of moving parts like gears, pulleys, and linkages. The combination of corrosion-resistant material and robust 70,000 psi tensile strength makes it ideal for applications in chemical processing, marine environments, and food machinery where durability and hygiene are paramount. Its socket head with hex drive allows for easy access in confined spaces, reducing assembly time and maintenance costs.
Specification Summary & Compliance
This shoulder screw features precise dimensional tolerances, including a Class 3A thread fit for high accuracy, shoulder diameter tolerance of -0.004" to -0.002", and shoulder length tolerance of -0.005" to 0.005". It conforms to ASME B18.3 manufacturing specifications and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe and reliable use in global markets.
