S-8077A819 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, ideal for harsh environments and chemical exposure
- Enhanced durability and wear resistance from the black oxide finish, providing long-lasting performance
- Precise alignment and smooth rotation ensured by the standard shoulder fit and Class 3A thread tolerance
- High-strength performance with 70,000 psi tensile strength and 35,000 psi minimum shear strength for demanding applications
- Secure and easy installation using a 5/32" hex drive and knurled head for improved grip and torque application
- Reliable coarse threading with 1/4"-20 UNC threads, offering quick assembly and reduced cross-threading risks
- Compliance with industry standards including ASME B18.3, RoHS 3, and REACH for quality assurance and environmental safety
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw is engineered to address common industrial challenges such as misalignment, corrosion, and mechanical stress. The black oxide finish enhances surface hardness and reduces friction, making it suitable for high-wear applications in machinery, automotive, and aerospace sectors. The UNC coarse thread and Class 3A thread fit ensure secure fastening in dynamic environments, while the precise shoulder diameter and length provide stable support for rotating components like bearings and pulleys. Its high tensile and shear strength guarantees reliability in heavy-duty assemblies, minimizing downtime and maintenance costs.
Specification Summary & Compliance
This shoulder screw features a Class 3A thread fit with 1/4"-20 UNC coarse threading, ensuring tight tolerances and consistent performance. Manufacturing adheres to ASME B18.3 specifications, with shoulder diameter tolerance of -0.004" to -0.002" and shoulder length tolerance of -0.005" to 0.005". The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmentally responsible sourcing and usage.
