S-97768A398 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 18-8 stainless steel and black oxide finish, ideal for harsh industrial environments
- Precise alignment and spacing ensured by the 4-1/2" shoulder with tight diameter tolerance for stable component positioning
- High tensile strength of 70,000 psi and Rockwell B55 hardness for reliable performance under heavy loads
- Easy installation and removal with hex socket drive and knurled head for secure tool grip
- Accurate thread engagement through UNC coarse threading and Class 3A fit, reducing cross-threading risks
- Durable construction that withstands repetitive rotational movement in machinery applications
- Compliance with industry standards including ASME B18.3, RoHS 3, and REACH for quality assurance
Professional Applications & Engineering Value
This shoulder screw is engineered to address critical alignment and durability challenges in industrial settings. The 18-8 stainless steel material, enhanced with a black oxide finish, provides excellent resistance to corrosion and wear, making it suitable for applications exposed to moisture or chemicals. The 4-1/2" shoulder length and precise diameter tolerance allow for accurate component spacing and rotational guidance in assemblies such as gears, pulleys, and linkages. With UNC coarse threading and Class 3A thread fit, it ensures quick assembly and reliable fastening in high-vibration environments, reducing maintenance downtime. The hex socket drive and knurled head facilitate easy installation in confined spaces, while the high tensile strength supports demanding mechanical operations, offering long-term reliability in machinery and automation systems.
Specification Summary & Compliance
This shoulder screw features a 5/16"-18 UNC thread with Class 3A thread fit for precise tolerance, and a shoulder diameter tolerance of -0.004" to -0.002" for accurate alignment. It meets ASME B18.3 specifications for dimensional consistency and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material quality.
