S-94328A935 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 140,000 psi tensile strength and Rockwell C30 hardness for reliable performance in demanding applications.
- Superior corrosion resistance provided by the black oxide finish, extending service life in harsh industrial environments.
- Precise alignment and secure positioning ensured by the 5/16" shoulder diameter with tight tolerance for reduced assembly play.
- Easy installation and removal with the hex socket drive and knurled head, allowing for high-torque application without slippage.
- Consistent thread engagement due to Class 3A fit and 1/4"-20 UNC coarse threads, minimizing cross-threading risks.
- Compliance with environmental regulations including RoHS 3 and REACH, making it suitable for global supply chains.
- Optimized for space-constrained designs with a low-profile socket head and 7/16" thread length for compact assemblies.
Professional Applications & Engineering Value
This alloy steel shoulder screw is engineered to address critical challenges in machinery assembly, pivoting mechanisms, and precision equipment. The black oxide finish not only enhances corrosion resistance but also reduces galling during installation, which is vital for maintenance-heavy environments. Its 1/4"-20 UNC coarse threads and Class 3A fit provide reliable fastening in high-vibration settings, such as automotive jigs or conveyor systems, where loosening can lead to operational failures. The knurled head and hex drive allow for secure tool grip, speeding up assembly lines while the precise shoulder diameter ensures accurate component spacing, reducing wear and improving alignment in rotating assemblies like bearings or pulleys.
Specification Summary & Compliance
This shoulder screw adheres to UNC thread standards with a Class 3A thread fit for tight tolerance, and features a shoulder diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005" for precision. It is manufactured in compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets environmental and safety standards for industrial use.
