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These small hole gages are well balanced tools that are ideal for accurately measuring small holes, slots, grooves, and recesses in all kinds of work. They all feature:
• Hardened-ball measuring surface with two-point contact
• Radius on each gage is less than the minimum diameter to be measured, which provides the two-point contact necessary for maximum accuracy
• Smooth, sensitive adjustment for better feel, giving more accurate measurements
• The adjustment of the gage beyond their range is restricted by a safety stop that prevents breakage
Accurate measurements are obtained by slightly "rocking" these gages in the hole to be measured. This will guarantee contact at the true diameter. The final size is then obtained by measuring over the ball contacts with a micrometer.
831 SMALL HOLE GAGES .125-.500"/3.2-12.7MM
These gages are exactly the same as the 829 Hole Gage except that the gaging surface is a half-ball with a flat bottom. This permits use in even the most shallow holes, slots, and recesses.
829 Small Hole Gages Range Inch
mm
.125-.200 .200-.300 .300-.400 .400-.500
Set of 4 in Case
831 Small Hole Gages .125-.200 .200-.300 .300-.400 .400-.500
Set of 4 in Case
830 Small Hole Gages .125-.150 .150-.200 .200-.300 .300-.400 .400-.500
Set of 5 in Case
3.2-3.8 3.8-5.1 5.1-7.6 7.6-10.2 10.2-12.7
3.2-5.1 5.1-7.6 7.6-10.2 10.2-12.7
2-13/16 3-1/8 3-3/8 3-1/2
70 80 85 90
3.2-5.1 5.1-7.6 7.6-10.2 10.2-12.7
Approx. Length Inch
2-7/8 3
3-3/8 3-1/2
mm 75 80 85 90
Cat. No. 829A 829B 829C 829D
S829EZ
831A 831B 831C 831D
S831EZ 2 50
830A 830B 830C 830D 830E
S830FZ EDP
53070 53071 53072 53073 53074
53083 53084 53085 53086 53087
53076 53077 53078 53079 53080 53081
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