S-91087A120 1/4"-20 x 1" Wood Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-phosphate steel coating, extending service life in demanding wood and sheet metal environments
• Enhanced torque transmission through T30 Torx drive design, reducing cam-out and tool wear during high-torque applications
• Optimal material displacement with thread-forming design, creating stronger, vibration-resistant connections without pre-tapping
• Flush installation capability with standard 82° flat head profile and countersink angle for clean, professional finishes
• Reliable coarse threading (UNC 1/4"-20) providing excellent pull-out resistance in wood and sheet metal substrates
• Full-length threading ensuring maximum grip along the entire 1" shaft for superior holding power
• Precision compatibility with No. 3 drill bit (0.213") for accurate pilot hole preparation and reduced installation stress

Professional Applications & Engineering Value

These 1/4-20 UNC thread forming screws solve critical fastening challenges in sheet metal and wood assemblies where vibration resistance and material integrity are paramount. The black-phosphate steel construction provides essential corrosion protection for industrial environments, while the Torx T30 drive system prevents stripping during high-torque installation. The thread forming design eliminates the need for tapped holes, creating stronger connections by displacing material rather than removing it. This engineering approach minimizes stress concentrations and provides superior resistance to loosening in wood screw applications, making these fasteners ideal for structural assemblies, furniture manufacturing, and metal framing where long-term reliability is critical.

Specification Summary & Compliance

Manufactured to precise UNC coarse thread standards with Class 2A fit tolerances for consistent performance. Features right-hand threading and fully threaded 1" length with blunt tip design. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in industrial applications worldwide. Designed for use with standard No. 3 drill bits (0.213" diameter) and featuring an 82° countersink angle for proper flush mounting in various materials.