Vernier Bore Gages 78XT Bore Gages .080-12"/1-300MM The 78XT Bore Gages feature extended travel, reducing the need to exchange anvils. The ground contact points seat the internal micrometer faster and more accurately than the spherical contacts found in other gages. These rugged and accurate internal micrometers are available individually or in economical sets from .080-12" (2-300mm). 78XTZ-138 measuring a bore. Fea tures • Wide measurement range without changing anvils • Resolution from .0001" (0.0025mm) on the 2-point contact toolsup to 3/4" (20mm) and .00025" (0.005mm) on the 3-point contact tools ranging from 3/4"-12" (20mm - 300mm) • Tungsten carbide measuring faces on all 3-point heads above 1/2" (12.5mm) • Ratchetstopensuresconsistentmeasurements • Self-centering contacts for true readings • Blind bore measuring capability above 1/2" (12.5mm) diameter • Extensions available up to 6" (150mm) for deep hole measuring • Setting rings included • Depth stop/collar also available for .080"-.250" (1-6mm) range • Each micrometer bore gage is furnished in a case, complete with setting ring, contacts, wrenches, and instructions 78XT Bore Gages, 2-Point Contact (.080-.250" Range) Cat. No. EDP Range (in) Accuracy (in) Approximate Measuring Depth (in) Setting Ring Diameter (in) 78XTZ-100 68124 .080-.100 0.00015 3/8 .100 78XTZ-120 68125 .100-.120 78XTZ-160 68126 .120-.160 0.00015 15/32 .160 78XTZ-200 68127 .160-.200 0.00015 3/4 .160 78XTZ-250 68128 .200-.250 .200 78XT Bore Gages, 3-Point Contact (1/4-12" Range) Cat. No. EDP Range (in) Accuracy (in) Approximate Measuring Depth (in) Setting Ring Diameter (in) 78XTZ-312 68129 1/4-5/16 .00015 2-1/4 .3125 78XTZ-375 68130 5/16-3/8 .3125 78XTZ-500 68131 3/8-1/2 .500 78XTZ-625 68132 1/2-5/8 .00015 2-7/16 .500 78XTZ-750 68133 5/8-3/4 .750 78XTZ-1 68134 3/4-1 .00015 2-5/8 .750 78XTZ-138 67674 1-1-3/8 1.375 78XTZ-2 67675 1-3/8-2 .00015 3-1/16 1.375 78XTZ-258 67676 2-2-5/8 .00020 3-1/16 2.625 78XTZ-314 67677 2-5/8-3-1/4 78XTZ-4 67678 3-1/4-4 .00020 4 3.250 78XTZ-5 67679 4-5 .00025 4 5.0 78XTZ-6 67680 5-6 .00025 4-1/2 5.0 78XTZ-7 67681 6-7 .00030 4-1/2 7.0 78XTZ-8 67682 7- 8 7.0 78XTZ-9 67857 8-9 9.0 78XTZ-10 67858 9-10 .00030 4-5/8 9.0 78XTZ-11 67859 10-11 .00035 4-5/8 11.0 78XTZ-12 67860 11-12 78XT Sets, 2-Point Contact (.250" Range) Cat. No. EDP Range (in) Number of Heads Number of Rings S78XTBZ 68152 .120-.250 3 2 78XT Sets, 3-Point Contact (1/4-4" Range) Cat. No. EDP Range (in) Number of Heads Number of Rings S78XTCZ 68153 1/4-3/8 2 1 S78XTDZ 68154 3/8-3/4 3 2 S78XTEZ 67683 3/4-2 3 2 S78XTFZ 67684 2-4 3 2 78XTZ-2 209 starrett.com B ore G ages