S-91440A554 1/4"-20 x 3" ASME B18.6.3 Steel Round Head Combination Phillips/Slotted Screws
Steel Round Head Combination Phillips/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, ensuring long-lasting performance in demanding industrial environments.
- High tensile strength of 60,000 psi provides reliable fastening integrity for critical applications under stress.
- Rockwell B70 hardness offers excellent durability and resistance to wear and deformation during installation and use.
- Versatile Phillips/Slotted drive (No. 3 size) allows for flexible installation with common tools, reducing assembly time.
- Fully threaded UNC coarse spacing ensures quick, secure engagement and superior holding power in various materials.
- Class 2A thread fit guarantees consistent, precise threading for smooth assembly and reduced cross-threading risks.
- Compliance with ASME B18.6.3, RoHS 3, and REACH assures quality, safety, and environmental standards for global industrial use.
Professional Applications & Engineering Value
This zinc-plated steel rounded head screw is engineered to address common industrial challenges such as corrosion, vibration loosening, and assembly efficiency. The 1/4-20 UNC coarse thread with Class 2A fit provides rapid installation and robust fastening in metal, wood, and plastic components, minimizing the risk of stripping. The combination of 60,000 psi tensile strength and Rockwell B70 hardness ensures reliable performance in high-stress environments like machinery, automotive assemblies, and construction frameworks. The Phillips/Slotted drive offers tool flexibility, speeding up maintenance and production lines while the rounded head design reduces snagging and improves safety. Ideal for OEM and MRO applications, this screw delivers consistent, compliant fastening solutions that enhance operational durability and reduce lifecycle costs.
Specification Summary & Compliance
This product features precise UNC coarse thread spacing with Class 2A thread fit for accurate dimensional tolerance. It is manufactured in accordance with ASME B18.6.3 specifications and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring adherence to international safety and environmental standards.
