S-90471A115 2-56 x 1/4" ASME B18.6.3 Steel Phillips Flat Head Screws
Steel Phillips Flat Head 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-plated steel construction for extended service life in demanding environments
- Reliable fastening performance ensured by Rockwell B70 hardness for consistent strength and durability
- Quick and secure installation with Phillips No. 1 drive and standard 100° countersink angle for flush mounting
- Optimized thread engagement through fully threaded UNC coarse design and Class 2A fit for vibration resistance
- Industry-standard compliance meeting ASME B18.6.3 specifications for dimensional accuracy and reliability
- Environmental responsibility with RoHS 3 and REACH compliance for safe use across industrial applications
- Versatile right-hand threading compatible with standard inch-system components and assembly processes
Professional Applications & Engineering Value
These 2-56 UNC flat head screws deliver exceptional engineering value in precision assembly applications where space constraints and surface finish matter. The zinc-plated steel construction provides essential corrosion protection for electrical enclosures, machinery components, and automotive assemblies exposed to moderate environmental conditions. The fully threaded coarse pitch design ensures maximum grip strength in thin materials, while the standard 100° countersink angle allows for flush mounting in predrilled surfaces without protrusion. The Phillips No. 1 drive offers reliable torque transmission during installation, reducing the risk of cam-out and damage to critical components. These industrial screws are particularly valuable in maintenance operations and OEM production lines where consistent Class 2A thread fit guarantees repeatable performance across multiple disassembly and reassembly cycles.
Specification Summary & Compliance
Manufactured to precise inch system dimensions with 1/4" length and 0.162" head diameter. Thread specifications include 2-56 UNC coarse thread with Class 2A fit for standard tolerance applications. Compliant with ASME B18.6.3 mechanical standards for dimensional accuracy and performance. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for hazardous substance restrictions.
