S-91783A066 1-72 x 1/4" ASME B18.6.3 Stainless Steel Round Head Slotted Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments
• Precise thread engagement with Class 2A fit and UNF fine thread profile ensuring reliable, vibration-resistant connections
• Exceptional mechanical strength with 100,000 psi tensile strength and Rockwell B100 hardness for high-stress applications
• Optimized drive performance featuring a standard slotted drive and rounded head for controlled installation and reduced surface protrusion
• Full threading along the 1/4" length provides maximum grip and load distribution across the entire fastener
• Compliance with major industry standards including ASME B18.6.3 for dimensional consistency and RoHS 3/REACH for environmental safety
• Right-hand thread direction enables straightforward installation using standard tools and procedures

Professional Applications & Engineering Value

These 1-72 UNF rounded head slotted screws deliver critical performance in precision assemblies where corrosion resistance and mechanical reliability are paramount. The combination of 18-8 stainless steel material and passivated finish provides excellent protection against oxidation and chemical exposure, making them ideal for electronics, instrumentation, and marine applications. The fine UNF threads and Class 2A thread fit ensure tight tolerances and secure fastening in thin materials and delicate components, preventing loosening under vibration. The rounded head design with slotted drive offers both aesthetic appeal and practical installation control, while the fully threaded 1/4" length maximizes engagement in limited-space applications. These screws solve common engineering challenges including material compatibility, assembly precision, and long-term durability requirements.

Specification Summary & Compliance

This rounded head screw features inch system measurements with 1-72 UNF fine threads and Class 2A thread fit for precision dimensional accuracy. Manufacturing strictly follows ASME B18.6.3 specifications ensuring consistent quality and interchangeability. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming environmental safety and material restrictions adherence. With complete threading and right-hand direction, these screws meet industrial standards for reliability in critical assembly operations.