S-91273A163 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
- Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments
- Enhanced torque transmission through the knurled socket head and 1/8" hex drive, preventing tool slippage
- Precise component alignment with a 4" shoulder length and standard shoulder fit for stable assemblies
- Reliable thread engagement due to UNC coarse threads and Class 2A fit, ensuring consistent fastening
- High mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications
- Compliance with environmental regulations including RoHS 3 and REACH, supporting global supply chain requirements
- Durable performance with a minimum shear strength of 35,000 psi, reducing failure risks in dynamic loads
Professional Applications & Engineering Value
This shoulder screw is engineered to address common industrial challenges such as misalignment and wear in rotating assemblies. The 18-8 stainless steel material provides excellent resistance to corrosion and oxidation, making it suitable for machinery exposed to moisture or chemicals. The 4" shoulder length and precise 1/4" shoulder diameter allow for accurate positioning of components like gears and pulleys, minimizing vibration and extending equipment life. With a knurled socket head and UNC coarse threads, it ensures easy installation and secure fastening in high-stress environments, from automotive systems to conveyor equipment. Its high tensile strength and compliance with RoHS and REACH standards make it a reliable choice for OEMs and maintenance teams seeking durability and regulatory adherence.
Specification Summary & Compliance
The screw features a 1/4"-20 UNC coarse thread with Class 2A fit for standard tolerance, ensuring reliable thread engagement. Shoulder dimensions include a diameter of 1/4" with a tolerance of -0.004" to -0.002" and a length of 4" with a tolerance of -0.005" to 0.005" for precise assembly. Manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, it adheres to environmental and safety regulations for industrial use.
