S-91306A247 2-56 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 of 120,000 psi ensures reliable performance under high-stress conditions, reducing the risk of fastener failure.
- Superior corrosion resistance from zinc plating protects against rust and extends service life in harsh industrial environments.
- Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies with minimal backlash.
- Hex drive design allows for high-torque installation with standard tools, speeding up assembly and reducing strip-out risks.
- Fully threaded shank offers consistent clamping force along the entire length, enhancing joint stability.
- Rounded button head profile delivers a low-profile, finished appearance while minimizing snagging in confined spaces.
- Compliance with major industry standards including ASME B18.3 and ASTM F835 ensures consistent quality and interoperability.
Professional Applications & Engineering Value
These 2-56 UNC rounded head screws are engineered from zinc-plated alloy steel to address critical fastening challenges in precision assemblies. The coarse UNC thread and Class 3A fit provide excellent engagement in metals and plastics, resisting loosening under vibration—common in electronics, automotive controls, and machinery. The hex drive enables efficient installation with common drivers, reducing assembly time while the rounded button head sits flush to prevent interference. With a Rockwell C39 hardness and robust 120,000 psi tensile strength, these screws maintain integrity in high-load applications, offering a dependable solution for OEMs and maintenance teams requiring durable, standards-compliant industrial fasteners.
Specification Summary & Compliance
This product features a 2-56 UNC coarse thread with Class 3A fit for precise dimensional accuracy, and is fully threaded for uniform load distribution. Manufacturing adheres to ASME B18.3 and ASTM F835 specifications, ensuring consistent performance. The screws are RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for global supply chains.
