S-91273A579 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 and black oxide finish, ideal for harsh industrial environments.
- Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable, high-load applications.
- Precise alignment and secure fit with a 1/4" shoulder diameter and standard shoulder fit, reducing component wear.
- Easy installation and removal using the hex socket drive and knurled head for enhanced grip and torque application.
- Fine UNF thread (1/4"-28) with Class 2A fit ensures tight, vibration-resistant connections in precision assemblies.
- Consistent performance backed by Rockwell B55 hardness for durability and long service life.
- Compliance with environmental standards including RoHS 3 and REACH, ensuring safe and sustainable usage.
Professional Applications & Engineering Value
This black oxide 18-8 stainless steel shoulder screw is engineered to address common industrial challenges such as misalignment, corrosion, and mechanical failure. The 1/4"-28 UNF fine thread and Class 2A thread fit provide superior holding power in applications requiring precise thread engagement, from machinery and automotive systems to electronic enclosures. The hex socket head with knurled texture allows for efficient torque transmission in confined spaces, while the 3/8" thread length and standardized shoulder dimensions ensure consistent positioning of moving parts. Its high tensile and shear strength makes it suitable for dynamic loads, reducing maintenance needs and enhancing operational reliability in demanding environments.
Specification Summary & Compliance
This shoulder screw features a 1/4"-28 UNF fine thread with Class 2A thread fit for precise tolerance, and shoulder dimensions including a diameter of 1/4" (tolerance: -0.004" to -0.002") and length of 1/4" (tolerance: -0.005" to 0.005"). It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring adherence to environmental and safety standards for industrial use.
