S-91273A165 1/4"-28 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
- Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh environments and long-term reliability.
- Precise alignment and smooth rotation ensured by the Class 2A thread fit and standard shoulder fit, reducing assembly time and wear.
- High tensile strength of 70,000 psi and minimum shear strength of 35,000 psi for secure fastening in demanding mechanical applications.
- Easy installation and removal with the hex socket drive and knurled head, providing excellent grip and torque transmission.
- Accurate dimensional tolerances on shoulder diameter and length for consistent performance in precision assemblies.
- Compliance with RoHS 3 and REACH regulations, ensuring environmental safety and suitability for global markets.
- Durable Rockwell B55 hardness offering resistance to deformation under load, enhancing service life.
Professional Applications & Engineering Value
This 18-8 stainless steel shoulder screw is engineered to address critical alignment and durability challenges in industrial settings. Its 1/4"-28 UNF fine thread and 3/8" shoulder length with tight tolerances provide stable pivoting and precise positioning in machinery, automotive, and electronics assemblies. The hex socket knurled head allows for efficient torque application, reducing slippage during installation. Made from corrosion-resistant 18-8 stainless steel, it withstands exposure to moisture and chemicals, making it ideal for applications requiring high strength and longevity. This screw is commonly used in precision instruments, conveyor systems, and robotic arms where reliable, repeatable performance is essential.
Specification Summary & Compliance
This shoulder screw adheres to UNF thread standards with a Class 2A thread fit for precise engagement. Dimensions include a shoulder diameter of 1/4" with tolerance from -0.004" to -0.002", and shoulder length of 1/4" with tolerance from -0.005" to 0.005". It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances and suitable for various industrial and export requirements.
