Granite Parallels Produced in four standard sizes, Granite Parallels are useful in setting up work on surface plates and machine tables. They can also be used to elevate work above the surface of a plate to enable quick and easy inspection of piece parts with shoulders or steps. Available in matched pairs, finished flat and parallel on two opposite narrow faces or all four faces. Single parallels available by request. Storage cases are available at extra cost. Five-Face Master Squares Five-Face Granite Master Squares are popular for accurately checking the X-Y-Z axes on CNC machine tools and coordinate measuring machines. Laying in the horizontal position, the X and Y axes can be checked for 90º squareness. With the square in the vertical position, tracing along the vertical edge of the square can check the perpendicularity of the Z axis. By tracing along the top edge of the square while in the vertical position, it will check parallelism of the table in the X and Y axes. Five-face master squares may also be used on any work that requires the checking of squareness or parallelism. Granite Accessories Five-Face Master Squares Accuracy Grade – EDP Dimensions (Length x Height x Thickness) Weight AA Laboratory .000025"/6" TIR (0.0006/150mm) A Inspection .000050"/6" TIR (0.0012/150mm) in mm lb kg 81919 81920 12 x 12 x 3 300 x 300 x 75 41 19 81922 81923 14 x 14 x 3 350 x 350 x 75 56 25 81925 81926 16 x 16 x 4 400 x 400 x 100 98 44 81931 81932 24 x 24 x 4 600 x 600 x 100 220 100 81933 81934 36 x 36 x 6 900 x 900 x 150 855 388 24 x 24 and larger have a thru-hole for lifting with a sling. Granite Parallels Length x Width x Thickness Grade AA Laboratory Grade A Inspection Weight per Pair Case Only .000025"/6" TIR (0.0006/150mm) 2-Face 4-Face .000050"/6" TIR (0.0012/150mm) 2-Face 4-Face in mm in mm EDP EDP in mm EDP EDP lb kg EDP 6 x .75 x 1 150 x 19 x 25 .000025 0.0012 81691 81692 .000050 0.0025 81693 81694 1 .5 81720 12 x 1 x 2 300 x 25 x 50 81695 81696 81697 81698 5 2.3 81721 18 x 1.5 x 3 450 x 37.5 x 75 81699 81700 81701 81702 18 8 81722 24 x 2 x 4 600 x 50 x 100 81703 81704 81705 81706 42 19 81723 Five-Face Master Square Granite Parallels 419 starrett.com G ranite S urface P roducts