S-90275A571 1/4"-20 x 3 1/2" ASME B18.6.3 Steel Slotted Flat Head Screws
Steel Slotted 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 plating, extending service life in demanding industrial environments
- High tensile strength of 60,000 psi ensures reliable load-bearing capacity and joint integrity
- Rockwell B70 hardness provides excellent resistance to wear and deformation during installation
- Class 2A thread fit offers optimal assembly clearance while maintaining secure fastening
- 82° countersink angle enables flush mounting for clean, professional finishes
- Fully threaded design maximizes grip length and distributes stress evenly across the fastener
- UNC coarse threading facilitates quick installation and reduces cross-threading risks
Professional Applications & Engineering Value
This zinc-plated steel flat head screw delivers exceptional performance in machinery assembly, electrical enclosures, and structural frameworks where flush mounting is critical. The combination of 60,000 psi tensile strength and Rockwell B70 hardness ensures these slotted drive screws withstand vibration and dynamic loads without compromising joint security. The 1/4"-20 UNC coarse thread provides rapid installation in various materials, while the 82° countersink angle creates seamless surfaces ideal for manufacturing equipment, automotive components, and industrial fixtures. These fully threaded fasteners maintain consistent clamping force across their entire 3-1/2" length, making them particularly valuable in applications requiring extended engagement depth.
Specification Summary & Compliance
Manufactured to ASME B18.6.3 specifications with Class 2A thread fit tolerance for reliable interchangeability. The UNC coarse thread (1/4"-20) ensures compatibility with standard industrial components. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations guarantees environmental responsibility and workplace safety. The zinc-plated steel construction meets industry standards for corrosion protection while maintaining the specified 60,000 psi tensile strength and Rockwell B70 hardness requirements.
