S-91355A505 2-56 x 1/2" ASTM F835 Steel Flanged Button Head Hex-Drive Screws
Steel Flanged Button Head Hex-Drive Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Superior corrosion resistance with black-oxide coating, extending service life in demanding industrial environments.
- High tensile strength of 120,000 psi ensures reliable fastening under heavy loads and vibration.
- Precise Class 3A thread fit provides excellent engagement and reduces the risk of cross-threading during assembly.
- Flanged design with a wide, rounded button head distributes clamping force evenly and eliminates the need for a separate washer.
- Hex drive (0.050") allows for high-torque installation with standard tools, preventing cam-out and ensuring secure fastening.
- Fully threaded coarse (UNC) design offers maximum grip length and faster installation in a variety of materials.
- Hardness of Rockwell C39 provides excellent wear resistance and durability for long-term performance.
Professional Applications & Engineering Value
Engineered for reliability, this 2-56 UNC thread rounded head screw is manufactured from black-oxide alloy steel to solve critical challenges in industrial assembly. The combination of a Class 3A thread fit and coarse thread spacing ensures rapid, secure fastening in metals and plastics, reducing assembly time and improving production efficiency. The flanged, wide button head provides a larger bearing surface, preventing surface damage and maintaining joint integrity under dynamic loads. Ideal for electronics, machinery, and automotive applications, this screw’s 120,000 psi tensile strength and hex drive make it a top choice for high-vibration environments where failure is not an option.
Specification Summary & Compliance
This screw adheres to strict dimensional and performance standards, including a Class 3A thread fit per the Unified National Coarse (UNC) system. It is manufactured in compliance with ASTM F835 specifications, ensuring consistent quality and performance. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting global environmental and safety regulations for industrial components.
