S-90275A557 1/4"-28 x 1/2" ASME B18.6.3 Steel Slotted Flat Head Screws
Steel Slotted 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 harsh industrial environments
- Precise flush mounting capability thanks to the 82° countersink angle and standard flat head profile
- Reliable fine thread engagement with UNF Class 2A thread fit ensuring vibration resistance and secure fastening
- Exceptional mechanical strength delivering 60,000 psi tensile strength and Rockwell B70 hardness for heavy-duty applications
- Full-threaded design providing maximum grip length and load distribution across the entire fastener
- Industry-standard compliance meeting ASME B18.6.3 specifications for dimensional accuracy and performance
- Environmental regulation adherence with RoHS 3 and REACH compliance for global manufacturing acceptance
Professional Applications & Engineering Value
These 1/4"-28 UNF flat head slotted screws deliver critical engineering solutions where flush surface mounting and high-strength fastening are paramount. The zinc-plated steel construction provides essential corrosion protection for machinery, electrical enclosures, and automotive components exposed to moisture or chemicals. The fine UNF threading with Class 2A fit ensures superior vibration resistance in dynamic applications, while the 82° countersink angle enables seamless integration into precision-machined components. With 60,000 psi tensile strength and full threading, these screws maintain structural integrity under substantial loads, making them ideal for critical assemblies in manufacturing equipment, aerospace components, and industrial automation systems where reliability cannot be compromised.
Specification Summary & Compliance
Manufactured to exact ASME B18.6.3 standards with Class 2A thread fit tolerances for precision assembly. Features 1/4"-28 UNF fine threads in right-hand direction with full threading along the 1/2" length. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for global industrial applications and manufacturing processes.
