S-91440A550 1/4"-20 x 2" 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 industrial environments
- High tensile strength of 60,000 psi ensures reliable performance under heavy loads and vibration
- Rockwell B70 hardness provides excellent durability and resistance to wear during installation and use
- Dual Phillips/slotted drive with No. 3 size offers versatile installation options with common tools
- UNC coarse threading with Class 2A fit enables quick assembly and secure fastening in various materials
- Fully threaded 2" length provides maximum grip and holding power across the entire fastener
- Rounded head design creates a finished appearance while preventing snagging on equipment
Professional Applications & Engineering Value
These zinc-plated steel rounded head screws deliver exceptional value in industrial assembly where corrosion resistance and structural integrity are paramount. The combination of 60,000 psi tensile strength and Rockwell B70 hardness ensures these fasteners withstand vibration, shock loads, and repeated stress cycles in machinery, equipment frames, and structural applications. The UNC coarse thread pattern with Class 2A fit provides reliable engagement in both metal and composite materials, while the dual Phillips/slotted drive accommodates various installation tools without stripping. The fully threaded design maximizes clamping force across the entire 2" length, making these screws ideal for thick-section assemblies in manufacturing, construction, and heavy equipment maintenance.
Specification Summary & Compliance
Manufactured to exacting ASME B18.6.3 specifications with Class 2A thread fit tolerance for consistent performance. These inch-system screws feature 1/4"-20 UNC coarse threads with right-hand orientation and comply with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards. The zinc-plated steel construction meets industrial requirements for corrosion protection while maintaining the specified mechanical properties of 60,000 psi tensile strength and Rockwell B70 hardness.
