S-97595A271 1/4"-20 x 1 1/2" ASME B18.3 Brass Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from high-quality brass construction, ensuring long-term reliability in demanding environments
• Precise Class 3A thread fit delivers secure, vibration-resistant connections with minimal risk of loosening
• High tensile strength (50,000 psi) provides exceptional load-bearing capacity for heavy-duty applications
• Rockwell B55 hardness maintains thread integrity and prevents stripping during repeated installations
• 82° countersink angle enables flush mounting with standard countersunk holes for clean, professional finishes
• 5/32" hex drive allows for high-torque installation with standard tools while preventing cam-out
• Full threading along 1-1/2" length ensures maximum engagement and holding power throughout the fastener

Professional Applications & Engineering Value

This brass flat head screw with 1/4"-20 UNC coarse threading and Class 3A fit addresses critical challenges in industrial assembly where corrosion resistance and precision are paramount. The combination of brass material and hex drive design provides excellent performance in electrical enclosures, marine equipment, and plumbing systems where galvanic corrosion must be avoided. The 82° countersink angle ensures seamless integration with standard counterbored holes, while the fully threaded design maximizes pull-out resistance in soft materials and thin-section applications. Engineered for industrial fastening scenarios requiring both aesthetic appeal and mechanical reliability, this fastener delivers consistent performance in vibration-prone environments.

Specification Summary & Compliance

Manufactured to exacting ASME B18.3 standards with Class 3A thread fit precision and UNC coarse thread spacing. The screw features a 1/4"-20 thread size with right-hand direction and 1-1/2" fully threaded length. Compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in regulated industries. Mechanical properties include 50,000 psi tensile strength and Rockwell B55 hardness for consistent performance.