S-90276A124 5-40 x 1/4" ASME B18.6.3 Steel Round Head Slotted Screws
Steel Round Head Slotted 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, extending service life in demanding industrial environments
- Reliable coarse threading (5-40 UNC) ensures faster installation and reduced cross-threading risks compared to fine-thread alternatives
- Class 2A thread fit provides consistent, predictable assembly with standard mating components
- Rockwell B69 hardness rating delivers excellent durability and resistance to deformation under load
- Fully threaded design maximizes grip length and fastener security across the entire engagement area
- Slotted drive compatibility offers versatility for standard tooling while maintaining the rounded head's low-profile appearance
- Regulatory compliance meets ASME B18.6.3 specifications and environmental standards (RoHS 3, REACH) for global supply chain integration
Professional Applications & Engineering Value
These zinc-plated steel rounded head screws with 5-40 UNC coarse threading address critical industrial fastening challenges where vibration resistance, corrosion protection, and consistent performance are paramount. The combination of Rockwell B69 hardness and fully threaded construction ensures maintained clamp force in dynamic applications from machinery assembly to electronic enclosures. The rounded head profile provides a finished appearance while minimizing snag hazards, making these industrial screws ideal for consumer products, manufacturing equipment, and maintenance operations where both aesthetics and function matter. Their Class 2A thread fit guarantees interchangeability with standard components, reducing assembly time and inventory complexity.
Specification Summary & Compliance
Manufactured to ASME B18.6.3 specifications with Class 2A thread fit tolerances for consistent performance. The 5-40 UNC coarse thread maintains ISO-compatible dimensional accuracy while the zinc-plated steel construction meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards. All dimensions conform to inch system requirements including 1/4" length and 0.125" thread diameter.
