S-91440A544 1/4"-20 x 1 1/4" 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 for extended service life in demanding environments
- Exceptional mechanical strength with 60,000 psi tensile strength and Rockwell B70 hardness for reliable load-bearing performance
- Versatile drive compatibility through combined Phillips/slotted head design accommodating multiple tool types
- Optimized thread engagement with UNC coarse thread pattern ensuring faster installation and secure fastening
- Precision manufacturing with Class 2A thread fit guaranteeing consistent performance and interchangeability
- Full-threaded design providing maximum grip length and uniform stress distribution
- Regulatory compliance meeting ASME B18.6.3 standards for dimensional accuracy and quality assurance
Professional Applications & Engineering Value
These zinc-plated steel rounded head screws deliver exceptional performance in industrial assembly applications where corrosion resistance and mechanical reliability are paramount. The UNC coarse thread configuration enables rapid installation while maintaining superior pull-out resistance, making them ideal for production environments requiring efficient fastening cycles. The dual Phillips/slotted drive system provides installation flexibility, accommodating various tooling setups without compromising torque transmission. With 60,000 psi tensile strength and full threading, these fasteners distribute clamping forces evenly, preventing joint failure in vibration-prone equipment, machinery frames, and structural assemblies. The rounded head profile offers a finished appearance while minimizing surface protrusion in applications where clearance is a concern.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 2A thread fit tolerance ensuring consistent performance across applications. Complies with ASME B18.6.3 specifications for dimensional accuracy and mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements, confirming absence of restricted substances. Features 1/4"-20 UNC coarse threads with right-hand orientation and fully threaded shank for maximum engagement strength.
