S-91440A535 1/4"-20 x 3/8" 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 load-bearing capacity with 60,000 psi tensile strength for reliable performance in high-stress applications
- Enhanced durability from Rockwell B70 hardness, resisting wear and deformation under repeated use
- Versatile installation options with combined Phillips/slotted drive, accommodating various tool types for flexible assembly
- Precise thread engagement through Class 2A thread fit and UNC coarse threading, ensuring secure fastening and reduced cross-threading risks
- Full-thread design providing maximum grip along the entire 3/8" length for improved holding power
- Broad compatibility with standard No. 3 drive tools and rounded head profile for flush mounting in diverse applications
Professional Applications & Engineering Value
Engineered for industrial fastening challenges, these zinc-plated steel rounded head screws deliver reliable performance in machinery assembly, electrical enclosures, and structural components. The 1/4-20 UNC coarse thread configuration ensures quick installation and vibration resistance, while the Phillips/slotted drive accommodates both precision and high-torque applications. With 60,000 psi tensile strength and Rockwell B70 hardness, these fasteners withstand dynamic loads and harsh operating conditions, reducing maintenance frequency and downtime. The rounded head profile provides a clean finish while minimizing snagging hazards in automated systems.
Specification Summary & Compliance
Manufactured to ASME B18.6.3 specifications with Class 2A thread fit tolerance for consistent dimensional accuracy. Features 1/4"-20 UNC coarse threads with right-hand orientation and standard rounded head geometry. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across regulated industries.
