S-94328A956 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 durability and fatigue resistance with alloy steel construction and 140,000 psi tensile strength for demanding industrial cycles.
- Precise and secure component alignment ensured by the Class 3A thread fit and standard shoulder fit, minimizing assembly play.
- Superior corrosion resistance in harsh environments provided by the black oxide finish, extending service life.
- Easy installation and removal in confined spaces with the low-profile socket head and 5/32" hex drive.
- Enhanced grip and torque application from the knurled head texture, reducing tool slippage.
- Reliable performance in high-vibration applications due to the coarse 1/4-20 UNC thread and robust shoulder design.
- Compliance with global environmental and safety standards, being RoHS 3 and REACH compliant for responsible sourcing.
Professional Applications & Engineering Value
This alloy steel shoulder screw is engineered to solve critical alignment and load-bearing challenges in industrial machinery. The 1/4-20 UNC coarse thread with a Class 3A fit ensures vibration resistance and precise fastening in assemblies subject to dynamic stresses. The black oxide finish provides a protective layer against oxidation, making it ideal for automotive, manufacturing, and precision equipment where exposure to moisture and chemicals is common. The 5/16" shoulder diameter and 1-1/2" shoulder length act as a precise pivot or spacer, maintaining component alignment in linkages, gears, and rotating assemblies, thereby reducing wear and improving overall system longevity.
Specification Summary & Compliance
This shoulder screw adheres to UNC thread standards with a Class 3A precision thread fit for tight tolerances. The shoulder diameter tolerance is -0.004" to -0.002", and shoulder length tolerance is -0.005" to 0.005" for consistent performance. Manufactured from alloy steel with a hardness of Rockwell C30 and 140,000 psi tensile strength. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations.
