S-91306A311 4-40 x 1/4" 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
- Exceptional Tensile Strength: Withstands up to 120,000 psi, providing reliable holding power in demanding industrial applications.
- Superior Corrosion Resistance: Zinc-plated alloy steel construction ensures long-lasting durability in harsh environments.
- Precision Thread Fit: Class 3A UNC coarse threads offer secure, vibration-resistant fastening with minimal risk of stripping.
- Easy Installation: Hex drive design (1/16") allows for high-torque application and quick, secure installation with standard tools.
- Optimized Head Design: Rounded button head profile distributes clamping force evenly while maintaining a low-profile appearance.
- Enhanced Material Hardness: Rockwell C39 rating ensures excellent wear resistance and thread integrity through repeated use.
- Full Thread Engagement: Fully threaded 1/4" length provides maximum grip range and flexibility in various material thicknesses.
Professional Applications & Engineering Value
Engineered for precision assembly in industrial equipment, electronics, and machinery, these 4-40 UNC threaded rounded head screws deliver critical performance advantages. The zinc-plated alloy steel construction combats corrosion in demanding environments, while the Class 3A thread fit eliminates play and prevents loosening under vibration. The hex drive design enables high-torque installation without cam-out, making them ideal for applications requiring both accessibility and security. With 120,000 psi tensile strength and full threading, these fasteners maintain joint integrity in high-stress assemblies, from automotive components to industrial control systems where reliability is paramount.
Specification Summary & Compliance
These screws feature precision 4-40 UNC coarse threads with Class 3A fit tolerances, ensuring consistent performance across applications. Manufactured to ASME B18.3 and ASTM F835 specifications for dimensional accuracy and mechanical properties. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making them suitable for global industrial markets requiring verified material safety and sustainability standards.
