S-90298A606 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 from 18-8 stainless steel construction with passivated finish, ensuring long-term reliability in harsh environments
- Precise component alignment with 3" shoulder length maintained within ±0.005" tolerance for consistent assembly performance
- Exceptional thread reliability through Class 3A thread fit, minimizing vibration-induced loosening in demanding applications
- Enhanced grip and torque application with knurled socket head and 5/32" hex drive, preventing tool slippage during installation
- Optimized for high-stress applications featuring Rockwell B55 hardness for improved durability and load-bearing capacity
- Industry-standard compatibility with UNC coarse threading (1/4"-20) ensuring seamless integration with existing equipment
- Regulatory compliance assurance meeting ASME B18.3 specifications and RoHS/REACH environmental standards
Professional Applications & Engineering Value
This precision shoulder screw delivers critical engineering solutions where exact component positioning and rotational accuracy are paramount. The 3" shoulder length with tight ±0.005" tolerance provides a precise bearing surface for gears, pulleys, and linkages, eliminating misalignment issues in automated machinery and precision instruments. Manufactured from 18-8 stainless steel with passivated finish, it resists chemical degradation and galvanic corrosion in manufacturing environments. The Class 3A thread fit and UNC coarse threading maintain secure fastening under vibration, while the knurled socket head with hex drive ensures reliable torque transmission during maintenance cycles. Ideal for robotics, conveyor systems, and precision assembly jigs where dimensional stability and corrosion resistance are non-negotiable.
Specification Summary & Compliance
This 1/4"-20 shoulder screw features Class 3A thread fit with UNC coarse threading and maintains critical dimensions including 7/16" thread length and 5/16" shoulder diameter within -0.001" to 0.001" tolerance. Manufactured in compliance with ASME B18.3 specifications and certified RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring adherence to international quality and environmental standards for industrial applications.
