S-91259A485 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 Load-Bearing Capacity: With a tensile strength of 140,000 psi, this shoulder screw reliably handles high-stress applications without deformation.
- Superior Corrosion Resistance: The black oxide finish provides lasting protection against rust and wear in demanding industrial environments.
- Precision Thread Engagement: Class 3A thread fit ensures tight, secure fastening with minimal risk of loosening under vibration.
- Enhanced Grip and Handling: The knurled head texture allows for better manual adjustment and reduces slippage during installation.
- Optimized Shoulder Stability: A 1 7/8" shoulder length with tight tolerances provides accurate alignment and acts as a reliable pivot or spacer.
- High-Durability Material: Made from alloy steel with Rockwell C32 hardness, it offers excellent wear resistance and long service life.
- Wide Industry Compatibility: Compliant with ASME B18.3, RoHS 3, and REACH, ensuring safe use in regulated and sensitive applications.
Professional Applications & Engineering Value
This shoulder screw is engineered to address critical alignment and rotational movement challenges in machinery assembly. The alloy steel construction, combined with a black oxide finish, resists corrosion and extends component life in humid or abrasive settings. Its 5/16"-18 UNC coarse thread and Class 3A fit provide reliable fastening in high-vibration environments, such as automotive fixtures, conveyor systems, and precision tooling. The knurled socket head allows for easy installation with standard hex tools, reducing assembly time. Ideal for use in pivots, bearings, and linkages, this screw ensures consistent shoulder diameter and length for accurate positioning, minimizing downtime and maintenance costs.
Specification Summary & Compliance
This shoulder screw adheres to ASME B18.3 specifications, with a Class 3A thread fit for precise engagement. The shoulder diameter is 3/8" with a tolerance of -0.004" to -0.002", and the shoulder length is 1 7/8" with a tolerance of -0.005" to 0.005". It is manufactured from alloy steel per ASTM A574, and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards.
