S-91259A664 5/16"-18 ASME B18.3, ASTM A574 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 Durability: Alloy steel construction with Rockwell C32 hardness provides superior resistance to wear and deformation in demanding applications.
- High Load Capacity: Offers a tensile strength of 140,000 psi and minimum shear strength of 84,000 psi for reliable performance under heavy mechanical stress.
- Precision Fit & Alignment: Class 3A thread fit and tight shoulder diameter tolerance ensure accurate positioning and reduced vibration in assemblies.
- Corrosion Resistance: Black oxide finish protects against rust and extends service life in harsh industrial environments.
- Secure & Easy Installation: Knurled socket head with hex drive allows for non-slip, high-torque fastening using standard tools.
- Standard Compliance: Manufactured to meet ASME B18.3 specifications, guaranteeing consistent quality and interchangeability.
- Environmental Safety: RoHS 3 and REACH compliant, ensuring safe use in regulated industries without hazardous substances.
Professional Applications & Engineering Value
This shoulder screw is engineered to address critical alignment and pivot point requirements in machinery, automation, and precision equipment. The 7-inch shoulder length with minimal tolerance provides a stable bearing surface for rotating components like gears, pulleys, and linkages, minimizing misalignment and wear. The 5/16"-18 UNC coarse thread and Class 3A fit ensure secure fastening with high resistance to loosening under dynamic loads. Made from alloy steel with a black oxide finish, it withstands high-stress conditions while offering corrosion protection. Ideal for use in industrial robots, conveyor systems, and automotive assemblies, this screw enhances operational reliability and reduces maintenance needs.
Specification Summary & Compliance
The screw features a 5/16"-18 UNC thread with Class 3A fit for precise engagement, and a shoulder diameter tolerance of -0.004" to -0.002" for accurate alignment. It complies with ASME B18.3 manufacturing standards, ensuring dimensional consistency and performance. Additionally, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety and environmental compliance for global industrial use.
