S-91440A623 4-40 x 1/2" ASME B18.6.3 Steel Round Head Combination Phillips/Slotted Screws
Steel Round Head Combination Phillips/Slotted 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 with zinc-plated steel construction for extended service life in demanding environments
- Enhanced installation flexibility with dual Phillips/Slotted drive options for versatile tool compatibility
- Reliable thread engagement through Class 2A thread fit ensuring consistent fastening performance
- Optimized load distribution with rounded head design that minimizes surface stress concentrations
- Maximum thread coverage with fully threaded design for superior holding power across the entire length
- Exceptional mechanical strength with Rockwell B70 hardness rating for high-stress applications
- Broad industrial compatibility through ASME B18.6.3 compliance and coarse UNC threading
Professional Applications & Engineering Value
These 4-40 UNC zinc-plated steel rounded head screws deliver critical performance advantages for industrial assembly operations. The zinc-plated steel construction provides essential corrosion protection in environments where moisture or chemical exposure could compromise fastener integrity. The combination of Phillips/Slotted drive style offers installation versatility, allowing technicians to use multiple tool types without compromising torque application. The coarse UNC threading ensures rapid installation and superior resistance to vibration loosening, while the fully threaded design maximizes grip length for enhanced load distribution. These rounded head screws are particularly valuable in applications requiring flush or low-profile fastening solutions where head protrusion must be minimized without sacrificing clamping force.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 2A thread fit tolerance for consistent mating with corresponding nuts and threaded components. These screws conform to ASME B18.6.3 specifications for dimensional accuracy and mechanical properties. The Rockwell B70 hardness ensures reliable performance under mechanical stress. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations confirms environmental responsibility and material safety standards for global industrial applications.
