S-91355A011 2-56 x 1/4" ASTM F835 Steel Flanged Button Head Hex-Drive Screws
Steel Flanged 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 durability with Black-Oxide Alloy Steel construction providing reliable corrosion resistance in industrial environments
- Superior fastening performance achieved through Class 3A thread fit ensuring precise, secure connections in demanding applications
- High tensile strength rating of 120,000 psi delivers exceptional load-bearing capacity for critical assemblies
- Rockwell C39 hardness maintains structural integrity under repeated stress and vibration
- Flanged design with wide button head provides enhanced bearing surface and prevents pull-through in softer materials
- Hex drive compatibility enables quick installation and high torque application with standard tools
- Fully threaded design ensures maximum engagement strength along the entire 1/4" length
Professional Applications & Engineering Value
These 2-56 UNC rounded head screws with black-oxide coating are engineered to solve critical fastening challenges in precision industries. The coarse thread spacing combined with Class 3A fit provides superior resistance to vibration loosening in electronic enclosures, machinery components, and automotive assemblies. The flanged button head design distributes clamping force evenly, preventing damage to sensitive materials while the hex drive ensures reliable installation in confined spaces. Manufactured from alloy steel with controlled hardness, these screws maintain dimensional stability under thermal cycling and mechanical stress, making them ideal for applications requiring repeated disassembly and reassembly.
Specification Summary & Compliance
This 2-56 UNC screw features precision Class 3A thread fit with right-hand coarse threading and full thread engagement across the 1/4" length. The product meets ASTM F835 specifications for mechanical properties and dimensional accuracy. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental safety and material transparency. The manufacturing process maintains strict tolerance control for consistent performance in industrial fastening applications.
