The Crain 1812-Q Blade Screw is a replacement part specifically designed for the Crain No. 835 Heavy-Duty Undercut Jamb Saw, as well as other compatible models including the 812, 820, 825, 555, 545, and 575 undercut saws. This blade screw ensures secure attachment of the saw blade, maintaining safety and performance during operation. It is commonly used alongside other replacement components like the 1812-P Blade Clamp and 1812-R Hex Key Wrench, which are often included in maintenance or repair kits for the No. 835 saw. The 1812-Q is a small but critical part for keeping your undercut saw functioning properly, especially after repeated use or blade changes.