S-91440A558 1/4"-20 x 5" 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, extending service life in demanding environments.
- High tensile strength of 60,000 psi ensures reliable, secure fastening under heavy loads and vibration.
- Rockwell B70 hardness provides excellent durability and resistance to wear and deformation.
- Versatile Phillips/Slotted (No. 3) drive offers flexible installation with common hand or power tools.
- UNC coarse thread design enables faster installation and superior performance in wood, plastic, and sheet metal.
- Class 2A thread fit guarantees consistent, precise engagement for reliable assembly and disassembly.
- Fully threaded 5" length maximizes grip range and holding power across the entire fastener.
Professional Applications & Engineering Value
This zinc-plated steel rounded head screw is engineered to solve critical fastening challenges in industrial and construction settings. The UNC coarse thread and fully threaded design provide exceptional pull-out resistance and rapid installation in materials like structural timber, metal framing, and machinery assemblies. The combination of 60,000 psi tensile strength and Rockwell B70 hardness ensures the fastener withstands dynamic loads, vibration, and stress without failing. The rounded head with Phillips/Slotted drive offers a low-profile, secure fit that reduces the risk of cam-out during high-torque applications, making it ideal for heavy-duty equipment, construction projects, and manufacturing lines where reliability is non-negotiable.
Specification Summary & Compliance
This screw meets ASME B18.6.3 specifications for dimensional accuracy and performance. It features a Class 2A thread fit for consistent assembly and a 1/4"-20 UNC coarse thread with precise thread spacing. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free of hazardous substances and safe for use in regulated industries.
