S-91264A550 1/4"-20 ASME B18.3, ASTM A574 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
- Vibration-resistant locking with integrated nylon pellet maintains secure fastening in temperatures from -50° to 250°F, reducing maintenance in dynamic applications.
- Exceptional load-bearing capacity from 140,000 psi tensile strength and 84,000 psi shear strength ensures reliable performance under high-stress conditions.
- Precision Class 3A thread fit provides superior engagement and consistent clamping force in demanding assemblies.
- Durable black oxide finish on alloy steel resists corrosion and extends service life in industrial environments.
- Knurled socket head with 5/32" hex drive offers improved grip for easy installation and removal, even in confined spaces.
- Accurate shoulder dimensions with tight tolerances ensure proper alignment and smooth rotation in pulley, gear, and pivot applications.
- Full regulatory compliance with ASME B18.3, ASTM A574, RoHS 3, and REACH standards guarantees quality and environmental safety.
Professional Applications & Engineering Value
This alloy steel shoulder screw is engineered to address critical alignment and vibration challenges in precision machinery. The 1/4"-20 UNC coarse thread with Class 3A fit ensures rapid assembly and reliable torque transmission, while the 1 3/4" shoulder length provides stable bearing surfaces for rotating components like linkages and rollers. The black oxide finish enhances corrosion resistance in harsh operating conditions, and the integrated nylon pellet thread locker prevents loosening from shock or vibration. Ideal for industrial automation, automotive fixtures, and conveyor systems, this screw delivers consistent performance where dimensional accuracy and high tensile strength are paramount.
Specification Summary & Compliance
This shoulder screw features Class 3A thread fit with UNC coarse threading and precise shoulder diameter tolerance of -0.004" to -0.002". Manufactured to ASME B18.3 and ASTM A574 specifications, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards, ensuring environmental safety and material consistency for industrial use.
