S-91785A561 1/4"-28 x 1" ASME B18.6.3 Stainless Steel Truss Head Slotted Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments
• Exceptional mechanical strength delivering 100,000 psi tensile strength and Rockwell B100 hardness for reliable, long-term performance
• Precise thread engagement with Class 2A fine thread fit and fully threaded UNF design for secure, vibration-resistant installations
• Optimized head design featuring a wide rounded truss head that distributes load effectively and resists cam-out during slotted drive installation
• Regulatory compliance assurance meeting ASME B18.6.3 standards plus RoHS 3 and REACH environmental regulations
• Right-hand thread configuration with fine 1/4"-28 UNF spacing for superior holding power in precision applications
• Enhanced durability through controlled manufacturing processes ensuring consistent dimensional accuracy and material integrity

Professional Applications & Engineering Value

These rounded truss head slotted screws deliver exceptional engineering value across demanding industrial applications. The 18-8 stainless steel material combined with passivated finish provides outstanding corrosion resistance, making them ideal for machinery, electronic enclosures, and outdoor equipment where environmental exposure is a concern. The wide truss head design offers superior bearing surface distribution, preventing surface damage while the slotted drive accommodates traditional installation tools. With Class 2A thread fit and fine UNF threading, these screws ensure precise alignment and secure fastening in applications requiring vibration resistance and repeated maintenance access. The fully threaded right-hand configuration maximizes engagement depth, providing reliable performance in assembly lines, manufacturing equipment, and precision instrumentation where fastener integrity is critical.

Specification Summary & Compliance

This 1/4"-28 UNF screw features precise Class 2A thread fit per unified thread standards with fine thread spacing for optimal engagement. Manufacturing complies with ASME B18.6.3 specifications ensuring dimensional accuracy and performance reliability. The product meets RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) regulations for chemical safety. Mechanical properties include maintained 100,000 psi tensile strength and Rockwell B100 hardness through controlled production processes, delivering consistent performance for industrial fastening requirements.