Holtest
Holtest (Type II) SERIES 368 — Three-point Bore Micrometers
• The Holtests (type II) have three contact points made of alloy steel for a more economically priced tool. • Same accuracy as the titanium-coated Holtest models.
• Constant-force device allows stable measurement. • Can measure deep holes using an extension rod (optional).
Measurement example
C
368-769
368-770
368-774
Reference dimensions when measuring a blind hole
Range (mm) 12 - 20 20 - 30 30 - 50
L 3 (mm)
L 5 (mm)
2.6 or below
3.5 5.2
3.4 or below
10.0 14.0 13.8
SPECIFICATIONS
50 - 100 100 - 300
19.6 or below
Inch
Individual
Metric Order No.
Individual
Extension Rod (optional) 952621 (150 mm)
Extension Rod (optional) 952621 (150 mm)
Order No.
Range (in)
Graduation (in)
Accuracy (in)
Range (mm)
Graduation (mm)
Accuracy (µm)
368-864 0.5 - 0.65 368-865 0.65 - 0.8 368-866 0.8 - 1 1 - 1.2 368-868 1.2 - 1.6 368-869 1.6 - 2 368-870 2 - 2.5 368-867 368-871 2.5 - 3
368-764 12 - 16 368-765 16 - 20 368-766 20 - 25 368-767 25 - 30 368-768 30 - 40 368-769 40 - 50 368-770 50 - 63 368-771 62 - 75 368-772 75 - 88 368-773 87 - 100 368-774 100 - 125 368-775 125 - 150 368-776 150 - 175 368-777 175 - 200 368-778 200 - 225 368-779 225 - 250 368-780 250 - 275 368-781 275 - 300
±0.00015
±3
952622 (150 mm)
952622 (150 mm)
For special-order products, contact Mitutoyo America
368-872
3 - 3.5
±0.0002
±4
0.0002
0.005
368-873 3.5 - 4 368-874 4 - 5
368-875 368-876 368-877 368-878
5 - 6 6 - 7 7 - 8 8 - 9
952623 (150 mm)
952623 (150 mm)
±0.00025
±5
368-879 9 - 10 368-880 10 - 11 368-881 11 - 12 Note: Setting rings are optional.
±0.0003
±6
DIMENSIONS
Unit: mm
Range
L 2
L 1
12 - 16, 16 - 20 20 - 25, 25 - 30 30 - 40, 40 - 50
82 126 - 130 94 137 - 142 102 145 - 155 105 150 - 163
50 - 63, 62 - 75, 75 - 88, 87 - 100 100 - 125, 125 - 150, 150 - 175, 175 - 200 200 - 225, 225 - 250, 250 - 275, 275 - 300
161 227 - 252
L 2
L 1
Note: External appearance differs depending on the measuring range.
Where to Buy
C-11
L1
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