Due to application, These arbors are not Furnished with hex nut or washers., #47615, diameter (D) 1/4-28 Nf, shank (D) 1/4, overall length (L) 1-13/16, L1 1-1/4, application screw Type Mortising Cutter 55251, B 15/32, 47615 Threaded arbor for screw Type Mortising cutters 1/4-28 Nf DIA x 15/32 height x 1/4 inch shank