S-94496A520 1/4"-20 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 70,000 psi tensile strength and 35,000 psi shear strength, this shoulder screw reliably handles high-stress applications without failure.
- Precision Shoulder for Accurate Alignment – The 3/8" diameter shoulder ensures precise component positioning and reduces wear in assemblies.
- Corrosion-Resistant Zinc Plating – Extends service life by protecting against rust and environmental degradation in demanding industrial settings.
- Easy Installation with External Hex Drive – The smooth hex head allows for quick, secure tightening using standard tools, improving assembly efficiency.
- Coarse UNC Threads for Faster Assembly – The 1/4"-20 UNC thread design enables rapid engagement and reduces cross-threading risks.
- Consistent Performance with Class 2A Fit – Ensures reliable thread engagement and interchangeability in high-volume production environments.
- Compliant with Global Environmental Standards – Meets RoHS 3 and REACH regulations, making it suitable for international supply chains and regulated industries.
Professional Applications & Engineering Value
This steel shoulder screw is engineered to address critical alignment and load distribution challenges in industrial machinery, automation systems, and precision equipment. The 1-1/2" shoulder length provides a stable bearing surface for rotating components like gears and pulleys, minimizing misalignment and eccentric wear. The zinc plating offers a protective barrier against moisture and chemicals, essential for maintaining integrity in harsh operating environments. Combined with UNC coarse threads and Class 2A fit, it ensures quick installation and consistent performance in high-vibration applications, reducing maintenance downtime and improving overall assembly reliability.
Specification Summary & Compliance
This shoulder screw adheres to UNC thread standards with a Class 2A thread fit for precise tolerance. Shoulder diameter is 3/8" with a tolerance of -0.004" to 0", and shoulder length is 1-1/2" with a tolerance of -0.005" to 0.005". It is manufactured from steel with a hardness of Rockwell B80 and is RoHS 3 (2015/863/EU) compliant under exemption 6(a) and REACH (EC 1907/2006) compliant as of January 17, 2023.
