Gage Block Sets Square Block Sizes • All blocks are 24.1mm x 24.1mm • Blocks have a 6.7mm hole in the center • On blocks 5.0mm thick and over, the hole is countersunk on both faces. (croblox Wear Blocks are countersunk on one face only) Individual Rect angular and Square Gage Blocks - Metric System croblox® , CERAMIC AND STEEL Rect angular Block Sizes • Width: all blocks are 9mm wide • Length: For blocks 10mm thick and under, length is 30mm For blocks 10.5mm thick and above, length is 35mm Exceptions: *Blocks are 28.3mm long ** When ordering 0.5mm block, specify length (28.3 or 30mm) Individual Rectangular Gage Blocks croblox® Ceramic Steel Size/Millimeters Grade A1 AA A1 AA A1 0 00 0 00 0 0.3, 0.4* • 0.5** • • • • • 0.6 Through 0.9 in .1 Steps* • 1.0 or 1.0005 • • • • • 1.0 Wear Blocks • 1.001 Through 1.009 in Steps of .001 • • • • • 1.01 Through 1.14 in Steps of .01 • • • • • 1.15 Through 1.49 in Steps of .01 • • • • • 1.5 Through 1.9 in Steps of .1 • • • • • 2.0 • • • • • 2.0 Wear Blocks • 2.25 • 2.5 • • • • • 3.0 Through 4.5 in Steps of .5 • • • • • 5.0 Through 6.5 in Steps of .5 • • • • • 7.0 Through 10.0 in Steps of .5 • • • • • 10.5 Through 14.5 in Steps of .5 • • • 15.0 • • • • • 15.5 Through 19.5 in Steps of .5 • • • 20.0 • • • • • 20.5 Through 24.5 in Steps of .5 • • • 25.0 and 30.0 • • • • • 40.0 • • • • • 50.0 • • • • • 60.0 • • • • • 70.0 • • • • • 75.0 and 80.0 • • • • • 90.0 • • • • • 100.0 • • • • • Individual Square Gage Blocks croblox® Steel Steel Only Size/Millimeters Grade A1 AA A1 A1 AA 0 00 0 0 00 0.5 mm • • • 1.0 • • • 1.5 • • • 2.0Wear Blocks with 1 Side Countersunk • 2.0 or 2.0005 • • • 2.001 Through 2.009 in .001 Steps • • • 2.01 Through 2.49 in .01 Steps • • • 2.5 Through 2.9 in .1 Steps • • • 3.0 Through 10.0 in .5 Steps • • • 10.5 Through 14.5 in .5 Steps • 15mm • • • 15.5 Through 19.5 in .5 Steps • 20.0mm • • • 20.5 Through 24.5 in .5 Steps • 25.0 • • • 30.0 • • • 40.0 • 50.0 • • • 60.0 • 70.0 • 75.0 • • • 80.0 • 90.0 • 100.0 • • • 125.0 • • 150.0 • • 175.0 • • 200.0 • • 250.0 • • 300.0 • • 400.0 • • 500.0 • • How To Order Specify in this sequence:Shape,Material,"M" for Metric,Size andAccuracy Grade Shape Material Size Accuracy R=Rectangular S=Steel Listed in table Listed in table S=Square C=croblox® Y = Ceramic Example: RSM 2.0.A1 = Rectangular Steel block, Metric size 2.0, Grade A1 Accuracy 397 starrett.com S t arrett -W ebber G age B locks