S-91830A645 5/16"-18 x 1 1/2" Thumb Screws

Key Features & Benefits at a Glance

• Superior grip and tool-free operation with a 1 1/4" diameter knurled head for easy hand tightening and loosening in tight spaces.
• Exceptional corrosion resistance and durability provided by 18-8 Stainless Steel, ideal for harsh or wash-down environments.
• High mechanical strength and load-bearing capability with 80,000 PSI tensile strength and Rockwell B83 hardness for demanding applications.
• Reliable and precise coarse threading with UNC 5/16"-18 threads and Class 2A fit for quick assembly and secure fastening.
• Full-threaded design for maximum engagement along the entire 1 1/2" length, ensuring a strong hold in various material thicknesses.
• Raised round head profile for comfortable use and improved leverage during manual adjustments.
• Compliance with major environmental regulations including RoHS 3 and REACH, making it suitable for global industrial supply chains.

Professional Applications & Engineering Value

This 18-8 Stainless Steel thumb screw is engineered to solve common industrial challenges where frequent adjustments, corrosion resistance, and tool-free operation are critical. The coarse UNC thread and Class 2A fit enable rapid installation and removal, reducing maintenance downtime on machinery panels, access doors, and clamping fixtures. The large, knurled head offers a non-slip surface, even with oily hands or when wearing gloves, enhancing operator safety and efficiency. Its fully threaded 1 1/2" length provides versatile clamping force across different material depths, while the stainless steel construction ensures long-term performance in moist, chemical, or outdoor settings without rusting. Ideal for use in electronics enclosures, automotive jigs, and food processing equipment where high tensile strength and regulatory compliance are mandatory.

Specification Summary & Compliance

This thumb screw features a 5/16"-18 UNC coarse thread with a Class 2A thread fit for standard tolerance and easy assembly. It is manufactured from 18-8 Stainless Steel and is fully threaded with a right-hand thread direction. The product conforms to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free of restricted hazardous substances and suitable for industrial and international markets.