S-90276A541 1/4"-20 x 7/8" ASME B18.6.3 Steel Round Head Slotted Screws
Steel Round Head Slotted 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 zinc-plated steel construction for extended service life in harsh industrial environments
- Exceptional holding power with 60,000 psi tensile strength and Rockwell B69 hardness for demanding applications
- Reliable fastening performance through UNC coarse threading and Class 2A thread fit ensuring secure connections
- Full-length threading provides maximum grip and distribution of clamping force across the entire screw length
- Standard slotted drive enables easy installation with common tools while rounded head design reduces surface damage risks
- Regulatory compliance with ASME B18.6.3 standards and environmental regulations including RoHS 3 and REACH
- Right-hand thread direction offers familiar installation for standard industrial applications
Professional Applications & Engineering Value
This zinc-plated steel slotted round head screw delivers critical performance where corrosion resistance and structural integrity are paramount. The combination of UNC coarse threading and Class 2A thread fit ensures rapid assembly with consistent torque characteristics, reducing installation time in high-volume manufacturing. The fully threaded design maximizes surface contact in materials ranging from metal fabrications to heavy equipment assemblies, preventing loosening under vibration. With 60,000 psi tensile strength and Rockwell B69 hardness, these rounded head screws maintain clamp load in structural applications while the zinc plating provides essential protection against environmental degradation in outdoor or chemically exposed settings.
Specification Summary & Compliance
Manufactured to precise inch system dimensions: 1/4"-20 thread size with 7/8" length. Thread specifications include UNC coarse spacing with Class 2A thread fit tolerance for reliable engagement. Complies with ASME B18.6.3 mechanical standards for dimensional consistency and performance. Meets environmental regulations including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance for hazardous substance restrictions.
