S-90272A107 4-40 x 5/16" ASME B18.6.3 Steel Pan Head Phillips Screws
Steel Pan Head Phillips Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Superior corrosion resistance through zinc-plated steel construction for extended service life in demanding environments
- Reliable fastening performance with Class 2A thread fit ensuring consistent engagement and vibration resistance
- Enhanced durability from Rockwell B70 hardness maintaining structural integrity under mechanical stress
- Quick installation efficiency with Phillips No. 1 drive providing secure tool engagement and reduced stripping risk
- Maximum thread engagement through fully threaded design for superior holding power across the entire fastener length
- Broad compatibility with UNC coarse threading ensuring easy assembly and interchangeability in industrial applications
- Standardized pan head profile offering optimal bearing surface and clearance for consistent clamping force
Professional Applications & Engineering Value
These 4-40 UNC zinc-plated steel screws deliver critical performance advantages for industrial assembly operations. The coarse thread design enables rapid installation in various materials while resisting cross-threading, significantly reducing assembly time and rejection rates. The zinc-plated surface treatment creates a protective barrier against oxidation and environmental corrosion, making these rounded head screws ideal for electronics enclosures, machinery panels, and automotive components where moisture resistance is essential. With Rockwell B70 hardness and fully threaded construction, these fasteners maintain clamping force under vibration and thermal cycling, preventing loosening in dynamic applications. The standardized pan head profile with Phillips drive ensures consistent torque transmission while providing sufficient bearing surface for secure fastening in sheet metal, plastics, and composite materials.
Specification Summary & Compliance
Manufactured to ASME B18.6.3 specifications with Class 2A thread fit tolerances ensuring dimensional accuracy and interchangeability. These 4-40 UNC coarse thread screws feature precise 0.219" head diameter and 5/16" length dimensions. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations guarantees safe usage in regulated industries and international markets.
