S-91746A431 1/4"-20 x 2 1/2" Thumb Screws

Key Features & Benefits at a Glance

• Superior grip and torque application with knurled head texture for secure manual tightening without tools
• Exceptional corrosion resistance from 18-8 stainless steel construction, ideal for harsh industrial environments
• High mechanical strength with 80,000 psi tensile strength and Rockwell B83 hardness for reliable load-bearing performance
• Quick installation and adjustment with UNC coarse threading and right-hand thread direction for efficient assembly
• Optimized space efficiency due to low-profile round head design requiring minimal clearance
• Secure partial threading prevents over-tightening and provides controlled engagement depth
• Regulatory compliance assurance meeting RoHS 3 and REACH standards for safe industrial use

Professional Applications & Engineering Value

This 1/4"-20 knurled thumb screw delivers exceptional value in applications requiring frequent adjustments and reliable clamping force. The 18-8 stainless steel construction provides excellent corrosion resistance, making it suitable for manufacturing equipment, electronic enclosures, and outdoor machinery where environmental exposure is a concern. The knurled head texture ensures positive grip even with greasy hands or when wearing gloves, reducing installation time and improving operator safety. With its low-profile design and UNC coarse threading, this thumb screw offers quick engagement and disengagement in tight spaces, while the partial threading prevents cross-threading damage to expensive components. These features combine to create a durable, user-friendly fastening solution that minimizes maintenance and downtime in industrial settings.

Specification Summary & Compliance

This thumb screw features precision Class 2A thread fit with 1/4"-20 UNC coarse threads in right-hand direction, ensuring consistent engagement and reliable performance. The manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and material restrictions adherence. With dimensions including 11/16" head diameter, 2 1/2" total length, and 2 3/8" thread length, this component meets industrial standards for dimensional accuracy and mechanical properties.