S-91355A178 1/4"-20 x 5/8" Steel Flanged Button Head Hex-Drive Screws
Steel Flanged Button Head Hex-Drive 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 black-oxide coating for extended service life in harsh industrial environments
- Exceptional mechanical strength with 120,000 psi tensile strength and Rockwell C32 hardness for heavy-duty applications
- Precision thread engagement with Class 3A UNC coarse threads ensuring reliable fastening and vibration resistance
- Enhanced installation efficiency through 5/32" hex drive design providing secure tool engagement and reduced stripping risk
- Distributed load bearing with integrated flange and wide button head profile for superior surface protection
- Full-thread coverage along the 5/8" length for maximum grip strength and adjustment flexibility
- Environmental compliance meeting RoHS 3 and REACH standards for sustainable manufacturing practices
Professional Applications & Engineering Value
This black-oxide alloy steel rounded head screw delivers critical performance advantages in demanding industrial settings. The Class 3A UNC coarse threading provides excellent engagement in various materials while resisting vibration-induced loosening. The flange design combined with the wide button head profile distributes clamping force effectively, preventing surface damage and maintaining structural integrity. With fully threaded 1/4"-20 configuration and 5/32" hex drive, installation becomes significantly faster while ensuring consistent torque application. These features make it ideal for assembly lines, machinery manufacturing, and equipment maintenance where high tensile strength and reliable fastening are paramount.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 3A thread fit and UNC coarse thread spacing (1/4"-20). The screw features a 0.563" flange diameter and 0.132" head height with right-hand threading. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring adherence to international safety and sustainability standards for industrial components.
