S-90298A826 1/2"-13 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 construction and passivated finish for extended service life in harsh environments
- Exceptional thread precision with Class 3A fit and UNC coarse threads ensuring reliable, vibration-resistant fastening
- Optimized load distribution through the 3-1/2" shoulder length providing stable bearing surfaces for rotating components
- Enhanced installation control with 5/16" hex drive and knurled head for secure tool grip and reduced slippage
- Consistent dimensional accuracy with tight shoulder diameter and length tolerances maintaining precise alignment in assemblies
- Robust mechanical performance backed by Rockwell B55 hardness for dependable strength in heavy-duty applications
- Full regulatory compliance meeting ASME B18.3 specifications and RoHS/REACH environmental standards
Professional Applications & Engineering Value
This 18-8 stainless steel shoulder screw delivers critical engineering solutions for precision machinery and industrial equipment. The 1/2"-13 UNC coarse threads with Class 3A fit provide superior engagement in high-vibration environments, while the extended 3-1/2" shoulder length serves as an accurate axle or pivot point for rotating components. The passivated finish enhances corrosion resistance in demanding conditions, and the 5/16" hex drive with knurled head ensures secure installation torque transfer. These features make it ideal for precision alignment in automation systems, machinery assemblies, and manufacturing equipment where dimensional stability and corrosion resistance are paramount.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 3A thread fit for precision threading applications. Features include: 1/2"-13 UNC coarse threads, 0.5" thread diameter, 3/4" thread length, 5/8" shoulder diameter with -0.001" to 0.001" tolerance, and 3-1/2" shoulder length with -0.005" to 0.005" tolerance. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across industrial applications.
