S-90471A428 4-40 x 3/4" ASME B18.6.3 Steel Phillips Flat Head Screws
Steel Phillips Flat Head 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 60,000 psi tensile strength ensures reliable fastening under high-stress conditions without failure
- Precise Class 2A thread fit provides smooth installation and consistent clamping force for assembly efficiency
- 100° countersink angle with standard flat head profile enables flush mounting for clean, professional finishes
- Full threading along 3/4" length maximizes grip range and adjustment flexibility in various material thicknesses
- Phillips No. 1 drive design offers familiar, secure tool engagement for rapid installation and removal
- Rockwell B70 hardness rating maintains thread integrity and drive durability through repeated use
Professional Applications & Engineering Value
Engineered for industrial applications requiring reliable fastening solutions, these 4-40 UNC flat head screws address critical assembly challenges through their zinc-plated steel construction and coarse thread design. The combination of 60,000 psi tensile strength and Rockwell B70 hardness ensures secure fastening in vibration-prone environments while resisting stripping and deformation. The standard flat head profile with 100° countersink angle provides seamless integration into countersunk holes, creating flush surfaces ideal for machinery, electronics enclosures, and structural components where protrusion-free mounting is essential. The fully threaded configuration accommodates varying material thicknesses, making these Phillips drive screws versatile for production lines and maintenance applications.
Specification Summary & Compliance
Manufactured to exacting ASME B18.6.3 specifications with Class 2A thread fit tolerances for consistent performance. These 4-40 UNC coarse thread screws feature right-hand threading and comply with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global markets. The zinc-plated steel construction meets industrial corrosion protection standards while maintaining the specified 60,000 psi tensile strength and dimensional accuracy throughout the 3/4" length.
