S-91306A512 1/4"-28 x 1/2" 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 tensile strength rated at 120,000 psi for reliable performance under high-stress applications
- Precision Class 3A thread fit ensures secure fastening with minimal backlash in critical assemblies
- Optimized hex drive design with 5/32" drive size providing superior torque transmission and reduced stripping risk
- Enhanced durability from Rockwell C39 hardness that maintains thread integrity through repeated installations
- Full threading coverage along the entire 1/2" length for maximum grip and load distribution
- Comprehensive regulatory compliance meeting ASME, ASTM, RoHS 3 and REACH standards for global industrial use
Professional Applications & Engineering Value
These zinc-plated alloy steel rounded head screws with UNF fine threading deliver critical performance advantages in precision manufacturing and heavy-duty equipment applications. The Class 3A thread fit provides exceptional dimensional accuracy that eliminates vibration-induced loosening in machinery, automotive, and aerospace assemblies. The button head profile with hex drive offers flush mounting where clearance is limited while maintaining high torque capability. Engineered with 120,000 psi tensile strength and Rockwell C39 hardness, these fasteners withstand extreme mechanical stresses while the corrosion-resistant zinc plating ensures long-term reliability in harsh operating conditions. The 1/4"-28 fine thread configuration delivers superior clamping force distribution for critical joint integrity.
Specification Summary & Compliance
Manufactured to exacting Class 3A thread fit tolerances per UNF fine thread standards, these screws guarantee precise engagement and consistent performance. The 1/2" length with fully threaded design provides complete fastening coverage. Compliance with ASME B18.3 and ASTM F835 specifications ensures dimensional consistency and mechanical properties, while RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance confirms environmental safety standards for global industrial distribution and use.
