S-90276A135 5-40 x 1 1/4" ASME B18.6.3 Steel Round Head Slotted Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, extending service life in demanding industrial environments
• High tensile strength of 60,000 psi ensures reliable fastening performance under substantial mechanical stress
• Rockwell B69 hardness rating provides excellent wear resistance and durability for repeated assembly operations
• Class 2A thread fit with UNC coarse threading enables quick installation and secure holding power in various materials
• Fully threaded design offers maximum engagement length and consistent clamping force throughout the fastener
• Slotted rounded head design allows for easy installation with standard screwdrivers while providing a finished appearance
• Comprehensive regulatory compliance ensures environmental safety and meets international industry standards

Professional Applications & Engineering Value

These 5-40 UNC zinc-plated steel screws deliver exceptional engineering value through their optimized material properties and precise thread form. The zinc-plated steel construction provides essential corrosion protection for industrial equipment, electrical enclosures, and machinery components exposed to moderate environmental conditions. The coarse UNC threading with Class 2A fit ensures reliable engagement in both metals and plastics, reducing the risk of cross-threading during assembly. The rounded head slotted design offers practical installation advantages where tool access is limited, while the fully threaded configuration maximizes load distribution across the entire fastener length. These characteristics make them particularly valuable for maintenance, repair, and OEM applications requiring consistent, high-performance fastening solutions.

Specification Summary & Compliance

These rounded head slotted screws feature precise Class 2A thread fit tolerances according to UNC standards, ensuring consistent performance across manufacturing applications. The manufacturing process strictly adheres to ASME B18.6.3 specifications for dimensional accuracy and mechanical properties. Environmental compliance includes full conformance with RoHS 3 (2015/863/EU) restrictions on hazardous substances and REACH (EC 1907/2006) regulations for chemical safety, making them suitable for global industrial markets and environmentally conscious manufacturing operations.