Pro-Graad 37012 QC-T 1/4"-20 Thread Flap Wheel – Bore Polisher Adapter, 1/4-20 Female x 1/4-20 Female Threaded, Pack of 1

The Pro-Graad 37012 QC-T is a precision-machined 1/4"-20 Female x Female threaded adapter engineered to connect 1/4"-20 threaded flap wheels, bore polishers, mounted points, and rotary finishing accessories to a standard 1/4" shank extension mandrel. Built for metalworkers, fabricators, machinists, and woodworkers who demand reliable, repeatable performance from their tooling setups. Important: This adapter is female-threaded on both ends. A 1/4" shank x 1/4-20 male threaded extension mandrel is required (not included) to mount this adapter in your die grinder, drill, or rotary tool. Once paired with the correct mandrel, this adapter delivers a solid, low-runout connection to any 1/4"-20 threaded accessory. Pro-Graad machines this adapter to tight thread tolerances — no wobble, no slop, no vibration-induced runout that telegraphs into your finish or your bore. Whether you're polishing cylinder bores, deburring internal diameters, blending weld seams, or finishing tight cavities with a flap wheel, the 37012 holds your accessory true at speed. Standard 1/4"-20 threading means broad compatibility across the abrasives and finishing accessories you already stock — no proprietary systems, no locked ecosystems, no hunting for manufacturer-specific mandrels. Applications: Bore polishing, ID finishing, deburring, surface prep, woodworking, metalworking, fabrication, MRO. Specs: 1/4"-20 Female x 1/4"-20 Female | Pack of 1 | UPC: 810195112224 [IN THE BOX]: 1 each Pro-Graad 37012 QC-T 1/4"-20 Female Threaded Flap Wheel & Bore Polisher Adapter [UNIVERSAL 1/4"-20 THREAD COMPATIBILITY]: Dual Female 1/4-20 threaded design connects flap wheels, mounted points, and rotary accessories to standard 1/4"-20 threaded extension mandrels (not included) — no proprietary fittings, no adapters you'll never find again [REQUIRES 1/4" SHANK x 1/4-20 MALE THREADED EXTENSION MANDREL (NOT INCLUDED)]: This adapter is Female x Female — a 1/4" shank / 1/4-20 male threaded extension mandrel (not included) is required to mount this in your tool; which then pairs with any standard die grinder, drill, or rotary tool via that mandrel [PRO-GRAAD PRECISION MACHINED]: Tight thread tolerances mean no wobble, no slop, no runout that kills your finish — built to the same standard as the abrasives it's designed to run [BROAD APPLICATION ACROSS METAL, WOOD, AND SURFACE PREP]: Once mounted on the correct mandrel, runs 1/4"-20 threaded flap wheels, mounted points, and 1/4-20 threaded finishing accessories across metalworking, fabrication, woodworking, and deburring applications [PRODUCT GUARANTEE]: All Pro-Graad products are made with quality materials, which exceed industrial grade standards. We are driven to deliver high-quality, high-performing products to the end user. This is why we stand behind our Product Guarantee. If you are not satisfied with the product, simply return your purchase within 30 days, and we will replace or refund your order. Pro-Graad is a USA Company with US Based Customer Support.