S-91783A140 1-72 x 3/4" ASME B18.6.3 Stainless Steel Round Head Slotted Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish for extended service life in harsh environments
• Exceptional mechanical strength with 100,000 psi tensile strength and Rockwell B100 hardness for reliable performance under high stress
• Precision thread engagement with Class 2A fit and UNF fine thread profile ensuring secure fastening and vibration resistance
• Broad compatibility with standard UNF 1-72 threaded components and tooling for seamless integration
• Enhanced installation control through slotted drive design providing positive tool engagement and torque application
• Full regulatory compliance meeting ASME B18.6.3 specifications and environmental standards including RoHS 3 and REACH
• Complete thread coverage with fully threaded shank for maximum grip length and holding power

Professional Applications & Engineering Value

This 1-72 UNF rounded head slotted screw delivers exceptional engineering value in precision assembly applications where corrosion resistance and mechanical reliability are critical. The 18-8 stainless steel material combined with passivated finish provides superior protection against oxidation and chemical exposure, making it ideal for marine, chemical processing, and food equipment applications. The UNF fine thread configuration ensures tighter sealing and better vibration resistance compared to coarse threads, while the Class 2A thread fit guarantees consistent engagement without binding. The rounded head profile distributes clamping force evenly, preventing surface damage in delicate assemblies. These features make this fastener particularly valuable in precision instrumentation, optical equipment, and electronic enclosures where dimensional stability and corrosion protection are paramount.

Specification Summary & Compliance

This precision fastener features Class 2A thread fit tolerance per UNF standards with 1-72 thread size and fine thread spacing. Manufacturing complies with ASME B18.6.3 specifications ensuring dimensional accuracy and performance reliability. The screw is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, containing no restricted substances. With complete threading along the 3/4" length and right-hand thread direction, it maintains consistent mechanical properties throughout its service life.