S-8077A579 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 from 316 stainless steel construction, ideal for harsh environments like marine or chemical processing.
- Exceptional mechanical strength with 70,000 psi tensile and 35,000 psi shear strength for reliable performance under high-stress loads.
- Precise alignment and smooth rotation enabled by the Class 3A thread fit and standard shoulder, reducing wear in assemblies.
- Enhanced grip and easy installation with the knurled socket head and 3/16" hex drive, preventing tool slippage.
- Durable, wear-resistant surface thanks to the black oxide finish, which also provides a sleek, low-reflectivity appearance.
- Broad compatibility with UNC coarse threads, ensuring quick assembly and interchangeability in various industrial systems.
- Compliance with major industry standards including ASME B18.3, RoHS 3, and REACH, guaranteeing safety and regulatory adherence.
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw is engineered to address critical challenges in precision machinery and heavy-duty equipment. The UNC coarse thread and Class 3A fit provide tight tolerances that minimize backlash and vibration, essential for applications like rotating shafts, pivoting mechanisms, and conveyor systems. The black oxide finish enhances corrosion resistance, extending service life in humid or chemically aggressive environments such as food processing, marine hardware, and outdoor machinery. With a Rockwell B79 hardness and robust shoulder design, it ensures stable bearing surfaces and reduces component wear, making it a reliable choice for automation, aerospace, and automotive assemblies where durability and precision alignment are paramount.
Specification Summary & Compliance
This shoulder screw features a 5/16"-18 UNC coarse thread with a Class 3A fit for high precision, along with a shoulder diameter of 3/8" and length of 11/32" within specified tolerances. Manufactured to ASME B18.3 specifications, it ensures dimensional accuracy and performance reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety for use in various industrial and consumer applications without hazardous substances.
