S-8077A575 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
- Superior corrosion resistance with 316 Stainless Steel construction, ideal for harsh environments and extended service life.
- Exceptional 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 enabled by the 7" shoulder with controlled diameter tolerance, reducing wear on mating parts.
- High-accuracy Class 3A thread fit ensures secure, vibration-resistant fastening with the coarse 5/16"-18 UNC thread.
- Enhanced grip and tool engagement from the knurled socket head and 3/16" hex drive, preventing slippage during installation.
- Durable black oxide finish provides added corrosion protection and a professional appearance.
- Compliance with major industry standards including ASME B18.3, RoHS 3, and REACH for guaranteed quality and environmental safety.
Professional Applications & Engineering Value
This 316 Stainless Steel shoulder screw is engineered to address critical challenges in industrial applications such as machinery assembly, pivoting mechanisms, and precision equipment. The 7-inch shoulder length and precise diameter tolerance provide a stable bearing surface, minimizing misalignment and reducing bushing wear. The coarse UNC thread and Class 3A fit ensure quick assembly and high resistance to loosening under vibration, while the black oxide finish on the stainless steel enhances durability in moderately corrosive conditions. Its high tensile and shear strength makes it suitable for heavy-duty fastening where reliability is paramount, supported by a knurled socket head for secure tool engagement in confined spaces.
Specification Summary & Compliance
This shoulder screw features a 5/16"-18 UNC thread with Class 3A fit for precision threading. The shoulder diameter is 3/8" with a tolerance of -0.004" to -0.002", and the shoulder length is 7" with a tolerance of -0.005" to 0.005". It is manufactured from 316 Stainless Steel with a black oxide finish, Rockwell B79 hardness, and meets ASME B18.3 specifications. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring adherence to environmental and safety regulations.
