S-91746A442 5/16"-18 x 1 3/4" Thumb Screws

Key Features & Benefits at a Glance

• Easy manual operation with a 3/4" knurled head for superior grip, even with gloves or oily hands
• Exceptional corrosion resistance from 18-8 Stainless Steel, ideal for harsh industrial environments
• High-strength performance with 80,000 psi tensile strength and Rockwell B83 hardness for reliable, repeated use
• Quick and secure coarse threading with 5/16"-18 UNC and Class 2A fit for fast assembly and vibration resistance
• Space-saving low-profile design with a 1/4" head height for applications with limited clearance
• Versatile partial threading over 1 11/16" for precise engagement and alignment in assemblies
• Environmental compliance assurance meeting RoHS 3 and REACH standards for safe, regulated use

Professional Applications & Engineering Value

This heavy-duty thumb screw is engineered to solve critical fastening challenges in industrial settings where tool-free, rapid adjustments are essential. The 18-8 Stainless Steel construction provides excellent resistance to rust and corrosion, making it suitable for outdoor equipment, marine hardware, and food processing machinery. The knurled head ensures a non-slip grip, reducing hand fatigue during frequent manual tightening in maintenance panels, clamps, or electronic enclosures. Its 5/16"-18 UNC coarse threads and Class 2A fit enable quick installation with minimal cross-threading risk, while the low-profile round head prevents snagging in compact spaces. Ideal for industrial thumb screw applications requiring durability, ease of use, and compliance with stringent environmental regulations like RoHS and REACH.

Specification Summary & Compliance

This thumb screw adheres to UNC coarse thread standards with a Class 2A thread fit for consistent dimensional accuracy and reliable performance. It is manufactured from 18-8 Stainless Steel with a tensile strength of 80,000 psi and Rockwell B83 hardness. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets current environmental and safety standards for industrial components.