S-94328A947 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 Tensile Strength – Withstands up to 140,000 psi for reliable performance in demanding applications.
- Precision Class 3A Thread Fit – Ensures tight, secure fastening with minimal backlash in assemblies.
- Superior Corrosion Resistance – Black oxide finish protects against rust, extending service life in harsh environments.
- Accurate Alignment & Stability – 5/16" shoulder diameter with controlled tolerances provides consistent positioning.
- High Durability – Alloy steel construction and Rockwell C30 hardness resist wear and deformation.
- Easy Installation & Removal – Hex drive (5/32") and knurled, low-profile socket head allow quick tool engagement.
- Compliance with Environmental Standards – Meets RoHS 3 and REACH regulations for safe, sustainable use.
Professional Applications & Engineering Value
This shoulder screw is engineered to address critical alignment and load-bearing challenges in industrial machinery, automation systems, and precision equipment. The 1/4"-20 UNC coarse thread with Class 3A fit ensures vibration-resistant connections, while the 5/16" shoulder diameter and 3/4" shoulder length provide a stable pivot or spacer that maintains exact positioning under stress. Made from alloy steel with a black oxide finish, it resists corrosion and wear, making it ideal for applications like robotics, conveyor systems, and fixture assemblies where reliability and repeatability are paramount. The low-profile socket head with knurling enhances grip in confined spaces, streamlining maintenance and reducing downtime.
Specification Summary & Compliance
This shoulder screw adheres to UNC thread standards with a Class 3A thread fit for high precision. Shoulder diameter tolerance is -0.004" to -0.002", and shoulder length tolerance is -0.005" to 0.005", ensuring consistent performance. It is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, supporting environmentally responsible sourcing and usage in global markets.
