S-8077A581 5/16"-18 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
- Exceptional corrosion resistance with 316 stainless steel construction, ideal for harsh industrial environments and chemical exposure.
- Superior mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable performance in high-stress applications.
- Precise alignment and smooth rotation ensured by the precision-ground shoulder with tight diameter and length tolerances.
- Enhanced grip and tool engagement from the knurled head and standard hex socket drive, preventing slippage during installation.
- Durable, wear-resistant surface provided by the black oxide finish, which also reduces light reflection and galling.
- High-accuracy Class 3A thread fit for secure fastening and vibration resistance in demanding assemblies.
- Full regulatory compliance with ASME B18.3, RoHS 3, and REACH, ensuring safety and environmental standards are met.
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw is engineered to address critical challenges in machinery and equipment design. The precision shoulder acts as a built-in spacer or pivot point, eliminating the need for additional components and reducing assembly time. Its high tensile and shear strength makes it suitable for applications subject to dynamic loads and vibrations, such as in conveyor systems, robotic arms, and automotive jigs. The black oxide finish on the corrosion-resistant 316 stainless steel provides an extra layer of protection against oxidation and wear, extending service life in humid or chemically aggressive environments. The knurled socket head ensures positive driver engagement, crucial for maintenance in tight spaces. This screw delivers reliable performance, reduces part count, and enhances the longevity of industrial assemblies.
Specification Summary & Compliance
This shoulder screw features a 5/16"-18 UNC coarse thread with a Class 3A thread fit for high precision. The shoulder diameter is 3/8" with a tolerance of -0.004" to -0.002", and the shoulder length is 1 1/2" with a tolerance of -0.005" to 0.005". It is manufactured to meet ASME B18.3 specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations.
