S-91355A088 3/8"-16 x 1/2" ASME B18.3, ASTM F835 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, extending service life in harsh industrial environments
- Exceptional load-bearing capacity from 120,000 psi tensile strength, preventing fastener failure under high stress
- Precision thread engagement with Class 3A fit ensuring reliable, vibration-resistant connections
- Enhanced installation efficiency through 7/32" hex drive design and coarse UNC threads
- Integrated flange design eliminates need for separate washers while distributing clamping force evenly
- Consistent performance maintained through Rockwell C39 hardness for repeated assembly/disassembly cycles
- Regulatory compliance assurance meeting ASME B18.3, RoHS 3, and REACH standards for global industrial use
Professional Applications & Engineering Value
These black-oxide alloy steel rounded head screws deliver critical performance advantages in demanding applications where corrosion resistance and structural integrity are paramount. The 3/8"-16 UNC coarse threading combined with Class 3A thread fit provides superior engagement in both soft and hard materials, reducing cross-threading risks during high-volume assembly operations. The integrated flange design offers dual benefits: eliminating separate washer components while providing enhanced bearing surface for improved joint stability. Particularly valuable in heavy machinery, automotive assemblies, and structural frameworks, these fully threaded fasteners maintain consistent clamping force even under vibrational stresses, making them ideal for applications requiring repeated maintenance access without compromising thread integrity.
Specification Summary & Compliance
Manufactured to exacting ASME B18.3 specifications with Class 3A thread tolerances for precision fit. The black-oxide alloy steel construction delivers 120,000 psi tensile strength and Rockwell C39 hardness. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety standards are met for global industrial distribution. Features 3/8"-16 UNC coarse threads with 1/2" length and 0.813" flange diameter for consistent performance across applications.
