S-91259A506 1/4"-20 ASME B18.3, ASTM A108 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 tensile strength of 140,000 psi ensures reliable performance in high-stress industrial applications, reducing the risk of fastener failure.
- Superior corrosion resistance from the black oxide finish prolongs service life in harsh environments, minimizing maintenance and replacement costs.
- Precision Class 3A thread fit with UNC coarse threads provides secure, vibration-resistant connections for stable assembly operations.
- Knurled socket head with hex drive allows for easy installation and removal, even in tight spaces, improving workflow efficiency.
- Rigorous compliance with ASME B18.3, RoHS 3, and REACH standards guarantees quality and safety for global industrial use.
- Alloy steel construction with Rockwell C32 hardness offers excellent durability and wear resistance for long-term reliability.
- Generous shoulder length of 5 1/2" with tight tolerances ensures precise alignment and spacing in machinery and rotating assemblies.
Professional Applications & Engineering Value
This alloy steel shoulder screw is engineered to address common industrial challenges such as misalignment, component wear, and corrosion. The black oxide finish provides a protective layer that resists rust and oxidation, making it ideal for use in humid or chemically aggressive environments like manufacturing equipment and automotive assemblies. The 1/4"-20 UNC coarse thread and Class 3A fit ensure quick, secure fastening with minimal risk of cross-threading, while the knurled socket head enhances grip during installation. With a robust shoulder diameter and length, this screw maintains precise part positioning in rotating shafts, pulleys, and bearings, reducing downtime and improving operational efficiency in industrial applications.
Specification Summary & Compliance
This shoulder screw adheres to Class 3A thread fit and UNC coarse thread standards, with precise shoulder diameter and length tolerances (e.g., shoulder diameter: -0.004" to -0.002"). It meets ASME B18.3 specifications and is manufactured in compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material quality for industrial use.
