Surface Plates

Granite surface plates offer very accurate, stable, precision surfaces that can be used for layout, gaging, and inspection. These plates also can be used as bases for fixtures, coordinate measuring machines, and other machines. They are self supporting, have a low co-efficient of expansion, and have a low degree of surface deflection under normal loads. Challenge granite surface plates meet or exceed Federal Specification GGG-P-463c and are in compliance with MIL-STD-45662A

Stands

These heavy-duty steel stands are available for all granite plates. Stationary stands have leveling screws at the bottom of each leg. Castered stands are funished with two fixed and two swivel casters for easy movement.

Angle Plates

Furnished with two surfaces (base and face), or four surfaces (base, face, and two sides) finished. Finished square and flat to tolerances shown below. Cases are available.

Inserted Angles

Inserted Angles have metal discs located in both one side, and main face for magnetizing purposes. Threaded inserts for clamping are located on the other main face. Cases are available.

Straight Edges

Straight Edges are used for checking the flatness of machine ways or beds, surface plates, and many other applications. Accuracies are measured on a center line of gauging surface per 12”. Cases are available.

Parallels

Parallels are matched in pairs and held parallel on top and bottom (two faces) or on top, bottom, and both sides (four faces) to overall accuracy listed below. Dimensions are held to nominal size +/- 1/32”. Cases are available.

V-Blocks

V-Blocks are furnished in pairs. V-blocks have 90 degree V’s that are centered and parallel to bottom and two sides, square to the ends. Cases are available.

Master Squares

Master Squares are finished with four narrow faces and one large face finished. Cases are available.

Master Angles

Master Angles come furnished to the tolerances below. A two-faced Master Angle has the two narrow faces finished. A three-faced Master Angle has the two narrow faces and one large face finished. Cases are available.

Cubes

Cubes form a perpendicular, flat and parallel reference plane. The cube contains ten 1/4-20 stainless steel inserts that can be used for clamping. Matched pairs available upon request. Cases are available.