S-91440A542 1/4"-20 x 1" 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
- Exceptional holding power with 60,000 psi tensile strength and Rockwell B70 hardness for reliable performance under heavy loads
- Versatile installation options through combined Phillips/Slotted drive compatibility, accommodating various tool types
- Optimized thread engagement with Class 2A UNC coarse threads ensuring secure fastening and reduced cross-threading risks
- Full-threaded design providing maximum grip length and uniform stress distribution across the entire fastener
- Standard-compliant reliability meeting ASME B18.6.3 specifications for dimensional accuracy and performance consistency
- Environmental compliance with RoHS 3 and REACH regulations, ensuring safe use across global industrial markets
Professional Applications & Engineering Value
These zinc-plated steel rounded head screws deliver critical performance advantages for industrial assembly applications where vibration resistance and long-term reliability are paramount. The 1/4-20 UNC coarse thread configuration provides rapid installation and superior pull-out resistance in metal, wood, and composite materials. The combination of Phillips/Slotted drive offers flexibility for maintenance crews using different tool systems, while the rounded head profile distributes clamping force evenly without surface marring. Engineered to withstand demanding conditions, these fully threaded screws maintain integrity in machinery, electrical enclosures, and structural frameworks where 60,000 psi tensile strength prevents joint failure under dynamic loads.
Specification Summary & Compliance
Manufactured to precise Class 2A thread fit tolerances with UNC coarse threading (1/4-20) in right-hand direction. Complies with ASME B18.6.3 dimensional standards for rounded head screws in inch system. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements. Features fully threaded design with standard rounded head profile (0.472" diameter, 0.175" height) and No. 3 Phillips/Slotted drive compatibility.
