S-91306A516 1/4"-28 x 3/4" ASTM F835 Steel Button Head Hex-Drive Screws
Steel 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 zinc plating that protects against rust in demanding industrial environments
- Exceptional load-bearing capacity thanks to 120,000 PSI tensile strength for reliable performance under high stress
- Precise thread engagement with Class 3A fine UNF threads ensuring vibration resistance and secure fastening
- Easy installation and removal with 5/32" hex drive that prevents stripping and allows high-torque application
- Enhanced durability from Rockwell C39 hardness that maintains structural integrity through repeated use
- Maximum thread contact with full threading along the entire 3/4" length for superior holding power
- Low-profile rounded head design that provides a finished appearance while minimizing snagging hazards
Professional Applications & Engineering Value
These zinc-plated alloy steel rounded head screws deliver critical performance advantages in precision assembly applications where vibration resistance and reliable fastening are paramount. The UNF fine thread configuration with Class 3A fit ensures minimal backlash and superior clamping force in machinery, automotive components, and electronic enclosures. The combination of 120,000 PSI tensile strength and Rockwell C39 hardness provides exceptional resistance to shear forces and fatigue, making these hex drive screws ideal for high-stress industrial environments. The fully threaded design maximizes engagement in both thick and thin materials, while the corrosion-resistant zinc plating extends service life in challenging conditions.
Specification Summary & Compliance
This 1/4"-28 x 3/4" rounded head screw features precision Class 3A thread fit with UNF fine threading and complete compliance with ASME B18.3 and ASTM F835 manufacturing standards. The product meets stringent regulatory requirements including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) compliance, ensuring environmental responsibility and material safety for global industrial applications.
