S-90298A603 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 construction, ideal for harsh industrial environments
- Precise alignment and smooth rotation thanks to the 4 1/2" shoulder with tight tolerances for consistent performance
- High-strength reliability with 70,000 psi tensile strength and 35,000 psi shear strength for demanding applications
- Secure, non-slip installation provided by the knurled socket head and 5/32" hex drive
- Accurate, durable threading with Class 3A UNC coarse threads ensuring superior fit and vibration resistance
- Broad regulatory compliance meeting ASME B18.3 standards and RoHS/REACH environmental directives
- Optimized for heavy-duty use featuring Rockwell B55 hardness for excellent wear resistance
Professional Applications & Engineering Value
This shoulder screw is engineered to address critical alignment and durability challenges in industrial applications. The 18-8 stainless steel material provides exceptional corrosion resistance, reducing maintenance in humid or chemically aggressive settings. The 4 1/2" precision shoulder with controlled tolerances ensures exact component positioning, minimizing wear and misalignment in machinery, pivots, and assemblies. Combined with Class 3A UNC coarse threads, it offers robust fastening that withstands vibrations and heavy loads. The knurled socket head and hex drive facilitate secure installation in confined spaces, enhancing assembly efficiency. Ideal for use in automotive, manufacturing, and precision equipment, this screw delivers long-term reliability and performance consistency.
Specification Summary & Compliance
This shoulder screw adheres to ASME B18.3 specifications, with Class 3A thread fit for high precision. The shoulder diameter tolerance is -0.004" to -0.002", and shoulder length tolerance is -0.005" to 0.005", ensuring dimensional accuracy. It is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety standards for global industrial use.
