Holtest
Holtest SERIES 368 — Three-point/Two-point Bore Micrometers
• These are standard analog three-point bore micrometers. (A two-point contact type with measuring range of .080 to .28 in diameter is available to measure extremely small holes.) • Three-point bore micrometer allows stable measurement through self centering. • Can measure close to the bottom of a blind hole. • Titanium-coated measuring pins on the three- point type (over .28 in / 6 mm range models) provide excellent durability and impact resistance. • Three-point type can measure deep holes by attaching an extension rod (optional).
Measurement example
C
368-174 (Three-point contact type)
368-168 (Three-point contact type)
368-001 (Two-point contact type)
SPECIFICATIONS Inch
Metric
Extension Rod (optional)
Extension Rod (optional)
Range (in)
Graduation (in)
Accuracy (in)
Range (mm)
Graduation (mm)
Accuracy (µm)
Order No.
Order No.
(Two-point) 368-021
(Two-point)
0.08 - 0.1 0.1 - 0.12 0.12 - 0.16 0.16 - 0.2
368-001 368-002 368-003 368-004 368-005
2 - 2.5 2.5 - 3
368-022 368-023 368-024 368-025 368-026 368-261 368-262 368-263 368-264 368-265 368-266 368-267 368-268 368-269 368-270 368-271 368-272 368-273 368-274 368-275 368-276 368-277 368-278 368-279 368-280 368-281
—
—
3 - 4 4 - 5 5 - 6
0.2 - 0.24 0.0001
±0.0001
0.001
±2
0.24 - 0.28
(Three-point)
(Three-point)
952322 (100 mm)
368-161 368-162 368-163 368-164 368-165 368-166 368-167 368-168 368-169 368-170 368-171 368-172 368-173 368-174 368-175 368-176 368-177 368-178 368-179 368-180 368-181
6 - 8
0.275 - 0.35 0.35 - 0.425 0.425 - 0.5
952322 (100 mm)
8 - 10 10 - 12 12 - 16 16 - 20 20 - 25 25 - 30 30 - 40 40 - 50 50 - 63 62 - 75 75 - 88 87 - 100 100 - 125 125 - 150 150 - 175 175 - 200 200 - 225 225 - 250 250 - 275 275 - 300
0.5 - 0.65 0.65 - 0.8 0.8 - 1 1 - 1.2 1.6 - 2 2 - 2.5 2.5 - 3 1.2 - 1.6
952621 (150 mm)
952621 (150 mm)
±0.00015
±3
952622 (150 mm)
952622 (150 mm)
3 - 3.5 3.5 - 4
±0.0002
±4
0.0002
0.005
4 - 5 5 - 6 6 - 7 7 - 8 8 - 9
952623 (150 mm)
952623 (150 mm)
±0.00025
±5
9 - 10 10 - 11 11 - 12
±0.0003
±6
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C-7
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