S-90273A299 12-24 x 1 1/2" ASME B18.6.3 Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc plating for extended service life in demanding industrial environments
• High-strength steel construction with 60,000 psi tensile strength ensures reliable performance under heavy loads
• Precision Class 2A thread fit provides smooth installation and secure fastening in UNC coarse thread applications
• Standard 82° countersink angle enables flush mounting for clean, professional finishes in metal and wood applications
• No. 3 Phillips drive design offers efficient installation with common tools while resisting cam-out
• Full threading along 1-1/2" length delivers maximum grip and adjustment flexibility in various material thicknesses
• Rockwell B70 hardness rating maintains thread integrity and prevents stripping during repeated use

Professional Applications & Engineering Value

These 12-24 UNC flat head screws deliver exceptional engineering value for industrial assembly applications where flush mounting and high tensile strength are critical. The zinc-plated steel construction provides reliable corrosion protection in manufacturing environments, while the coarse UNC threading ensures rapid installation and superior holding power in metal, wood, and composite materials. The standard 82° countersink angle perfectly matches common chamfered holes, eliminating protrusions and creating smooth surfaces ideal for machinery, equipment panels, and structural components. With full threading across the entire 1-1/2" length, these flat head screws accommodate varying material thicknesses while maintaining consistent clamping force, making them particularly valuable for assembly lines requiring both speed and reliability.

Specification Summary & Compliance

These industrial-grade flat head screws feature precise Class 2A thread fit with UNC coarse threading (12-24 thread size) and maintain strict dimensional accuracy per ASME B18.6.3 specifications. The manufacturing process ensures consistent 82° countersink angle and proper head diameter of 0.412" for reliable performance. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations confirms environmental responsibility and safe use across various industrial sectors, while the 60,000 psi tensile strength and Rockwell B70 hardness guarantee mechanical reliability in demanding applications.