S-90298A591 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 and passivated finish, ideal for harsh industrial environments
- Precise component alignment ensured by the 2" shoulder with tight ±0.005" length tolerance and ±0.001" diameter tolerance
- Exceptional thread reliability with Class 3A UNC coarse threads providing secure fastening in high-vibration applications
- High mechanical strength delivering 70,000 psi tensile strength and Rockwell B55 hardness for heavy-duty applications
- Easy installation and removal with knurled socket head and 5/32" hex drive preventing tool slippage
- Industry-standard compliance meeting ASME B18.3 specifications for guaranteed interchangeability and performance
- Environmental regulation compliance with RoHS 3 and REACH standards for safe use in regulated industries
Professional Applications & Engineering Value
This stainless steel shoulder screw solves critical alignment challenges in precision machinery and industrial equipment. The 2" shoulder length with minimal tolerances provides exact component spacing in assemblies, while the Class 3A UNC threads maintain secure fastening under dynamic loads. The 18-8 stainless steel material combined with passivated finish offers exceptional resistance to corrosion and chemical exposure, making it ideal for food processing, automotive, and aerospace applications where reliability is paramount. The knurled socket head with hex drive ensures positive tool engagement during installation, reducing assembly time and preventing damage to fastener heads in confined spaces.
Specification Summary & Compliance
Manufactured to ASME B18.3 standards with Class 3A thread fit for precision engagement. The shoulder maintains tight dimensional control with diameter tolerance of -0.001" to 0.001" and length tolerance of -0.005" to 0.005". Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations ensures safe use across global markets.
