S-90298A581 1/4"-20 ASME B18.3 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 and passivated finish for extended service life in harsh environments
- Precise component alignment thanks to 5/16" shoulder diameter with tight ±0.001" tolerance for reliable positioning
- Exceptional thread reliability with Class 3A fit and 1/4"-20 UNC coarse threads ensuring secure fastening in high-vibration applications
- Enhanced torque transmission through hex drive design and knurled head for superior grip during installation
- High mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for demanding industrial applications
- Reduced assembly time with standardized 3/4" shoulder length and right-hand thread direction for efficient installation
- Full regulatory compliance meeting ASME B18.3 standards and environmental regulations including RoHS 3 and REACH
Professional Applications & Engineering Value
This high-precision shoulder screw delivers critical engineering solutions for applications requiring exact component spacing and rotational control. The 18-8 Stainless Steel construction with passivated finish provides exceptional corrosion resistance in manufacturing environments exposed to moisture, chemicals, or outdoor conditions. The 5/16" shoulder diameter with tight ±0.001" tolerance ensures precise bearing surfaces and accurate alignment in machinery, while the Class 3A thread fit with 1/4"-20 UNC coarse threads maintains secure fastening under vibration and dynamic loads. The combination of 70,000 psi tensile strength and Rockwell B55 hardness makes this socket head shoulder screw ideal for precision equipment, automation systems, and industrial machinery where reliability and dimensional accuracy are paramount.
Specification Summary & Compliance
This shoulder screw maintains Class 3A thread fit per UNC standards with precise shoulder diameter tolerance of -0.001" to 0.001" and shoulder length tolerance of -0.005" to 0.005". Manufactured in compliance with ASME B18.3 specifications and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The inch system measurement ensures compatibility with standard industrial equipment and replacement parts.
