S-90272A323 4-40 x 1 1/8" ASME B18.6.3 Steel Pan Head Phillips Screws
Steel Pan Head Phillips 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 harsh environments
- Excellent driving torque transmission through Phillips No. 1 drive design, reducing tool slippage and damage
- Optimized load distribution with rounded pan head profile that minimizes surface damage during installation
- High mechanical strength with 60,000 psi tensile strength and Rockwell B70 hardness for demanding applications
- Reliable thread engagement through Class 2A thread fit and UNC coarse threading for secure fastening
- Full-length threading provides maximum grip and holding power across the entire 1 1/8" length
- Regulatory compliance assurance meeting ASME B18.6.3, RoHS 3, and REACH standards for industrial safety
Professional Applications & Engineering Value
These 4-40 UNC zinc-plated steel rounded head screws deliver exceptional performance in demanding industrial environments where corrosion resistance and mechanical strength are critical. The zinc-plated steel construction provides superior protection against environmental factors, while the Rockwell B70 hardness and 60,000 psi tensile strength ensure reliable performance under mechanical stress. The Phillips drive design offers efficient installation with reduced cam-out risk, and the rounded pan head profile distributes clamping force evenly without damaging mating surfaces. Ideal for industrial assembly applications, electronic enclosures, machinery components, and equipment manufacturing where coarse thread UNC fasteners with Class 2A thread fit provide secure, vibration-resistant connections in various materials.
Specification Summary & Compliance
These rounded head screws feature precise Class 2A thread fit with UNC coarse threading (4-40 size) and full threading along the 1 1/8" length. Manufactured to exacting ASME B18.6.3 specifications for dimensional accuracy and performance reliability. The products are fully compliant with RoHS 3 (2015/863/EU) restrictions on hazardous substances and meet REACH (EC 1907/2006) requirements for chemical safety, ensuring they can be used in regulated industrial applications worldwide.
