S-8077A828 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 reduced wear due to Class 3A thread fit and standard shoulder fit, ensuring reliable assembly performance.
- High tensile strength of 70,000 psi and minimum shear strength of 35,000 psi for dependable use in heavy-duty applications.
- Easy installation and removal with hex drive socket head and knurled texture, providing secure grip and torque application.
- Dimensional accuracy and interchangeability through compliance with ASME B18.3 standards and UNC coarse threading.
- Environmental and safety compliance with RoHS 3 and REACH regulations, ensuring safe use in various industries.
- Versatile shoulder design with consistent 5/16" diameter and 2 1/8" length for stable pivoting and spacing in mechanical assemblies.
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw with a black oxide finish is engineered to address common industrial challenges such as misalignment, corrosion, and mechanical stress. The UNC coarse thread and Class 3A fit provide tight tolerances, reducing the risk of loosening under vibration and ensuring long-term reliability in precision assemblies. Its high tensile strength and corrosion-resistant properties make it suitable for demanding sectors like automotive, machinery, and marine equipment, where durability and compliance with ASME B18.3 standards are critical. The knurled head and hex drive facilitate quick installation, minimizing downtime in production lines.
Specification Summary & Compliance
This shoulder screw adheres to Class 3A thread fit and UNC thread standards, with precise dimensions including a shoulder diameter of 5/16" (tolerance: -0.004" to -0.002") and shoulder length of 2 1/8" (tolerance: -0.005" to 0.005"). It meets ASME B18.3 specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and industrial reliability.
