S-8077A812 1/4"-20 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 alignment and smooth rotation thanks to the knurled head and standard shoulder fit for reduced assembly time
- High-strength performance with 70,000 psi tensile strength and 35,000 psi shear strength for demanding applications
- Reliable thread engagement ensured by Class 3A thread fit and coarse UNC threading for secure fastening
- Easy installation and removal with hex drive socket head design, requiring only a 5/32" hex key
- Durable material properties including Rockwell B79 hardness for long-lasting wear resistance
- Broad regulatory compliance meeting ASME B18.3, RoHS 3, and REACH standards for global industrial use
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw is engineered to address critical alignment and durability challenges in industrial machinery, automation systems, and precision equipment. The black oxide finish enhances corrosion resistance in humid or chemically aggressive settings, while the Class 3A thread fit and coarse 1/4"-20 UNC thread provide reliable, vibration-resistant connections. The knurled head improves grip during manual adjustments, and the standardized shoulder diameter ensures consistent positioning in bushings or bearings. Ideal for replacing metric shoulder screws in global projects, it supports high tensile and shear strength requirements without compromising on RoHS 3 and REACH compliance for environmentally conscious manufacturing.
Specification Summary & Compliance
This shoulder screw features precise dimensional tolerances, including a Class 3A thread fit for accurate engagement and a shoulder diameter tolerance of -0.004" to -0.002". It adheres to ASME B18.3 manufacturing specifications and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring suitability for international industrial applications with strict environmental and safety standards.
