S-90272A005 4-40 x 2 1/2" ASME B18.6.3 Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with zinc-plated steel construction, ensuring long-term reliability in harsh industrial environments
• Superior holding power with 60,000 psi tensile strength and full threading for maximum load distribution and vibration resistance
• Optimized installation efficiency featuring a No. 1 Phillips drive and rounded pan head for secure, slip-resistant fastening
• Precise thread compatibility with 4-40 UNC coarse threads and Class 2A fit, providing reliable engagement in various materials
• Enhanced durability with Rockwell B70 hardness, maintaining structural integrity under repeated stress
• Broad regulatory compliance meeting ASME B18.6.3 standards, RoHS 3, and REACH for safe, quality-assured applications
• Versatile 2-1/2" length designed for deep or extended fastening requirements in assemblies

Professional Applications & Engineering Value

These 4-40 UNC zinc-plated steel screws deliver robust performance in demanding industrial settings, where corrosion and mechanical stress are common challenges. The coarse thread design ensures quick, secure installation in soft materials or pre-tapped holes, reducing assembly time while the rounded pan head with Phillips drive offers excellent torque transmission and a low-profile finish. Fully threaded along the 2-1/2" length, they provide consistent clamping force, ideal for electrical enclosures, machinery panels, and automotive components. The zinc plating adds a protective barrier against moisture and chemicals, extending service life in environments like manufacturing plants or outdoor equipment. Engineered to ASME B18.6.3 specifications, these screws guarantee dimensional accuracy and reliability for critical fastening tasks.

Specification Summary & Compliance

This product adheres to Class 2A thread fit per UNC standards, ensuring precise tolerance for consistent performance. Manufacturing follows ASME B18.6.3 for dimensional integrity, with full compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming environmental safety and material restrictions. Threads are right-hand, coarse type (4-40 UNC), with a hardness of Rockwell B70 and tensile strength rated at 60,000 psi for dependable use in industrial assemblies.