S-90275A573 1/4"-20 x 4" ASME B18.6.3 Steel Slotted Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, extending service life in demanding environments
• High tensile strength of 60,000 psi ensures reliable load-bearing capacity and resistance to shear forces
• Rockwell B70 hardness provides excellent durability and wear resistance for repeated use
• Class 2A thread fit offers consistent, reliable assembly with standard UNC coarse threading
• Fully threaded design maximizes grip and holding power along the entire 4" length
• 82° countersink angle allows for flush mounting, creating a smooth, professional finish
• Slotted drive style enables quick, straightforward installation with common tools

Professional Applications & Engineering Value

This zinc-plated steel flat head screw is engineered to address critical industrial fastening challenges, particularly where high tensile strength and corrosion resistance are paramount. Its UNC coarse threading and Class 2A fit ensure rapid, secure installation in wood, metal, and composite materials, reducing assembly time while preventing cross-threading. The fully threaded 4" length provides uniform clamping force, ideal for structural applications, machinery assembly, and heavy-duty equipment where vibration resistance and long-term reliability are essential. The slotted flat head design facilitates flush mounting in countersunk holes, maintaining surface integrity in automotive, construction, and manufacturing settings.

Specification Summary & Compliance

This screw maintains precise Class 2A thread fit per UNC standards, ensuring consistent engagement and dimensional accuracy. Manufactured in compliance with ASME B18.6.3 specifications, it guarantees interchangeability and performance reliability. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting stringent environmental and safety regulations for industrial use worldwide.