S-91253A540 1/4"-20 x 3/4" ASTM F835 Alloy Steel Hex Drive Flat Head Screws
Alloy Steel Hex Drive Flat Head 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
- Exceptional tensile strength of 130,000 psi ensures reliable performance in high-stress industrial applications
- Precision Class 3A thread fit provides superior engagement and vibration resistance in demanding environments
- Black-oxide coating on alloy steel offers enhanced corrosion resistance for extended service life
- 82° countersink angle with flat head design creates flush surface finishes while maintaining structural integrity
- Hex drive configuration enables secure installation with standard tools and prevents stripping during high-torque applications
- Fully threaded coarse UNC pattern ensures rapid assembly and superior holding power in various materials
- Rockwell C39 hardness rating maintains thread integrity and prevents deformation under repeated use
Professional Applications & Engineering Value
These black-oxide alloy steel flat head screws with 1/4"-20 UNC coarse threading deliver exceptional engineering value across industrial sectors. The combination of 130,000 psi tensile strength and Class 3A thread fit addresses critical challenges in machinery assembly, automotive manufacturing, and heavy equipment applications where vibration resistance and precise alignment are paramount. The 82° countersink angle ensures seamless integration with standard chamfered holes, while the hex drive system provides superior torque transmission during installation. These fully threaded screws maintain consistent clamping force across the entire 3/4" length, making them ideal for securing components in structural frameworks, industrial enclosures, and precision equipment where reliability cannot be compromised.
Specification Summary & Compliance
Manufactured to exacting Class 3A thread tolerances with UNC coarse thread spacing and right-hand threading. Complies with ASME B18.3 and ASTM F835 manufacturing specifications. Meets RoHS 3 (2015/863/EU) compliance standards and REACH (EC 1907/2006) environmental regulations for industrial use. The black-oxide surface treatment on alloy steel substrate ensures consistent performance across temperature variations and harsh operating conditions.
