S-8077A623 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 industrial and marine environments.
- Enhanced durability and wear resistance from the black oxide finish, providing a protective layer against abrasion.
- High mechanical strength with 70,000 psi tensile and 35,000 psi shear strength, ensuring reliable performance under heavy loads.
- Precise thread engagement with Class 3A fit, offering superior vibration resistance and secure fastening in critical assemblies.
- Easy installation and removal using the hex socket drive and knurled head, allowing for efficient tool access and handling.
- Accurate shoulder positioning with controlled diameter and length tolerances, facilitating precise component alignment.
- Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and environmental responsibility.
Professional Applications & Engineering Value
This 5/16"-18 UNC shoulder screw is engineered to address common challenges in precision machinery and industrial equipment. The 316 stainless steel material provides excellent resistance to chemicals and moisture, reducing failure risks in demanding applications like pumps, valves, and conveyor systems. The black oxide finish minimizes galling and extends service life, while the Class 3A thread fit ensures tight tolerances for vibration-prone environments. Its knurled head and hex socket drive enable quick assembly and disassembly, saving time in maintenance and production lines. Ideal for securing rotating parts or acting as an axle, this shoulder screw delivers reliable performance where alignment and strength are critical.
Specification Summary & Compliance
This shoulder screw adheres to ASME B18.3 specifications, with a Class 3A thread fit for high-precision applications. Thread details include 5/16"-18 UNC coarse thread with right-hand direction, and shoulder dimensions feature tight tolerances (e.g., diameter: -0.004" to -0.002"). It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances. Mechanical properties include a Rockwell B79 hardness and 70,000 psi tensile strength, confirming its suitability for rigorous industrial use.
