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Holtest SERIES 368 — Two-point Bore Micrometers | MITUTOYO

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HT-R-TWO-POINT
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• These are standard analog three-point bore micrometers. (A two-point contact type with measuring range of 2 to 6 mm 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 6 mm range models) provide excellent durability and impact resistance.

• Three-point type can measure deep holes by attaching an extension rod (optional).

Holtest SERIES 368 — Two-point Bore Micrometers | MITUTOYO
Holtest SERIES 368 — Two-point Bore Micrometers | MITUTOYO

SPECIFICATIONS

Metric

Order No. Range*²
(mm)		 Graduation
(mm)		 Maximum permissible
error J MPE
(μm)*¹		 Extension Rod
(optional)
(Two-point)
368-001 2 - 2.5 0.001 ±2
(maximum
difference 2)		 —
368-002 2.5 - 3
368-003 3 - 4
368-004 4 - 5
368-005 5 - 6
(Three-point)
368-161 6 - 8 0.001 ±2
(maximum
difference 2)		 952322
(100 mm)
368-162 8 - 10
368-163 10 - 12
368-164 12 - 16 0.005 ±3
(maximum
difference 3)		 952621
(150 mm)
368-165 16 - 20
368-166 20 - 25 952622
(150 mm)
368-167 25 - 30
368-168 30 - 40
368-169 40 - 50
368-170 50 - 63 952623
(150 mm)
368-171 62 - 75 ±4
(maximum
difference 4)
368-172 75 - 88
368-173 87 - 100
368-174 100 - 125 ±5
(maximum
difference 5)
368-175 125 - 150
368-176 150 - 175
368-177 175 - 200
368-178 200 - 225 ±6
(maximum
difference 6)
368-179 225 - 250
368-180 250 - 275
368-181 275 - 300

*1 Additionally, the difference in permissible error allowable is limited to a value within this range, as given in parentheses, and is measured with the entire measuring surface in contact with the object measured.

*2 The measurement range cannot be enlarged by measuring heads that are not standard-supplied (the accuracy is not guaranteed).

Note: Setting rings are optional.

More Information
ข้อมูลเพิ่มเติม
แบรนด์สินค้า MITUTOYO
Digital/Analog Analog
Inch-Metric Metric
Dimension

Unit : mm

Range L2 L1
2 - 2.5, 2.5 - 3 mm 12 103.5 - 104
3 - 4, 4 - 5, 5 - 6 mm 22 113 - 114

Note: External appearance differs depending on the measuring range.

 

 

Range L2 L1
6 - 8, 8 - 10, 10 - 12 mm 59 102 - 104
12 - 16, 16 - 20 mm 82 126 - 130
20 - 25, 25 - 30 mm 94 137 - 142
30 - 40, 40 - 50 mm 102 145 - 155
50 - 63, 62 - 75, 75 - 88, 87 - 100 mm 105 150 - 163
100 - 125, 125 - 150, 150 - 175, 175 - 200,
200 - 225, 225 - 250, 250 - 275, 275 - 300 mm		 161 227 - 252

Note: External appearance differs depending on the measuring range.

 

 

Reference dimensions when measuring a blind hole

Range
(mm)		 L3
(mm)		 L4
(mm)		 L5
(mm)
2 - 6 — — 2
6 - 12 2 or below — 2.5
12 - 20 0.3 or below 5.6 3.5
20 - 30 8.3 5.2
30 - 50 13.0 10.0
50 - 100 17.0 14.0
100 - 300 12.4 or below 21.0 13.8
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