S-90280A555 1/4"-20 x 3" ASME B18.6.3 Steel Fillister Head Slotted Screws

Key Features & Benefits at a Glance

• Superior corrosion protection with zinc-plated steel construction, extending service life in demanding environments
• High-strength performance with 60,000 psi tensile strength and Rockwell B69 hardness for reliable load-bearing capacity
• Precision thread engagement through Class 2A UNC coarse threading, ensuring secure fastening and reduced cross-threading risks
• Enhanced drive stability with fillister head design and slotted drive, providing improved torque transmission and tool compatibility
• Full-threaded 3" length offering maximum grip range and versatility across various material thicknesses
• Regulatory compliance assurance meeting ASME B18.6.3 standards and environmental regulations (RoHS 3, REACH) for global industrial use
• Optimized head profile with high, narrow rounded design for reduced protrusion and cleaner installation appearance

Professional Applications & Engineering Value

This zinc-plated steel fillister head screw delivers critical engineering solutions where corrosion resistance and mechanical reliability are paramount. The combination of 60,000 psi tensile strength and Rockwell B69 hardness ensures dependable performance in vibration-prone assemblies, while the UNC coarse threading with Class 2A fit provides rapid installation and secure holding power in metal fabrication, machinery, and industrial equipment. The slotted drive system accommodates standard tools for maintenance accessibility, and the high-rounded head profile offers superior clearance in countersunk applications. Ideal for OEM manufacturing, electrical enclosures, and automotive components requiring ASME B18.6.3 compliance and environmental regulation adherence.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit and UNC coarse threading (1/4"-20). Fully compliant with ASME B18.6.3 specifications for slotted head screws. Meets environmental regulations including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance. Features consistent 3" fully threaded length and maintains dimensional accuracy across production batches for reliable interchangeability.