S-91744A581 5/16"-18 x 3/4" Thumb Screws

Key Features & Benefits at a Glance

• Tool-free manual operation with comfortable spade head design for quick assembly and disassembly without tools
• Superior corrosion resistance from 18-8 stainless steel construction for long-lasting performance in harsh environments
• Enhanced stability and load distribution through integrated flange design that prevents over-tightening
• Reliable coarse threading with UNC 5/16"-18 pattern for faster installation and reduced cross-threading risk
• Precision thread fit meeting Class 2A specifications ensuring consistent engagement and vibration resistance
• Full-length threading providing maximum grip strength along the entire 3/4" length
• Environmental compliance with RoHS 3 and REACH standards for safe use across regulated industries

Professional Applications & Engineering Value

This 18-8 stainless steel thumb screw delivers exceptional value in applications requiring frequent manual adjustments and tool-free maintenance. The corrosion-resistant material maintains integrity in moist or chemical environments, while the spade head design offers superior grip even with gloved hands. The flanged construction provides wider bearing surface, distributing clamping force evenly and preventing damage to sensitive materials. With coarse UNC threading and Class 2A fit, these thumb screws install quickly with reduced risk of cross-threading, making them ideal for equipment panels, access covers, and machinery requiring regular service. The right-hand thread direction ensures intuitive operation for maintenance personnel across industrial, electronic, and manufacturing settings.

Specification Summary & Compliance

This fastener features 5/16"-18 UNC coarse threading with Class 2A thread fit per standard inch specifications, ensuring precise dimensional accuracy. The fully threaded 3/4" length and 0.313" thread diameter provide consistent engagement throughout the fastener. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming restriction of hazardous substances. The flanged design with 0.563" diameter offers enhanced load distribution without requiring separate washers.