The Giant, Two Inch Diameter Flat

This very large, very rugged, flat, kinematic component, is offered in both the surface mount and the cylindrical post mount designs. The surface mount design is our part number F-2000-SM. The major cylindrical diameter of this giant part is 2.00 inches (50.8 mm). The body of this part is 5/8 inch ( 0.625”, 15.88 mm) thick. It has a one half inch (0.50 inch) [12.7 mm] diameter national fine (20 threads per inch) threaded hole in the center of the back of the part that is used to hold the part in position. The depth of this thread is 0.380 inch (9.65 mm). There is a 1.00 inch [25.4 mm] diameter shallow counter bore in the center of the back surface of this part that is 0.04 inch [1.0 mm] deep. Additional holes, threads, or slots, can be Electrical Discharge Machined ( EDM ), to specific customer requirements. See Figure #1.

The cylindrical post mounted version of this giant flat component is our part number F-2000-CPM. The major cylindrical diameter of this part is 2.00 inches (50.8mm). The body of the part is 5/8” 0.625 inch (15.88 mm) thick. The diameter of the cylindrical post is cylindrically ground to 3/4" 0.750inch (19.05 mm) plus nothing, minus 0.0005 inch (0.0127 mm).

The cylindrical post is 1/2” 0.500 inches (12.7 mm) long. There is a 3/8” 0.375 inch(9.5 mm) diameter with a 16 TPI threaded blind hole in the center of the post that is 1/2" 0.50 inch (12.7 mm) deep. This threaded hole is used to hold the part in place.

The flat flange between the 3/4" 0.75 inch (19.05 mm) cylindrical post and the 2.00 inch (50.8 mm ) major diameter, is precision ground flat and square to the post within 0.0002 inch (0.005 mm). See Figure #2. These large flat parts are made of a Martensitic stainless steel that is hardened to 58HRC. This very fine grain material has a very high tensile strength of 285,000 P.S.I. The flat working surface of these parts is precision ground parallel to the back flange and lapped flat. In addition to their use as a high load carrying kinematic component, this device makes an excellent anvil for dimensional metrology or as a flat reference datum for optical bread boards.