Mitutoyo-SERIES 368 - Three-point/Two point Internal Micrometers-Holtest

MITUTOYO-SERIES 368 – THREE-POINT/TWO POINT INTERNAL MICROMETERS-HOLTEST

Titanium-coated measuring pins on the three- point type (over 6mm range models) provide excellent durability and impact resistance and allow the instrument to measure right to the bottom of a blind Three-point bore micrometer with measuring range 6mm or longer allows stable measurement through automatic Can measure deep holes using an Extension rod (optional) which

SPECIFICATIONS

Metric

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

Inch

Order No.	Range	Graduation	Accuracy*1	Extension Rod (optional)
(Two-point) 368-021	.08″ – .1″	.0001″	±.0001″ (within .0001″)	—
368-022	.1″ – .12″
368-023	.12″ – .16″
368-024	.16″ – .2″
368-025	.2″ – .24″
368-026	.24″ – .28″
(Three-point) 368-261	.275″ – .35″			952322 (100mm)
368-262	.35″ – .425″
368-263	.425″ – .5″
368-264	.5″ – .65″	.0002″		952621 (150mm)
368-265	.65″ – .8″			952621 (150mm)
368-266	.8″ – 1″		±.00015″ (within .00015″)	952622 (150mm)
368-267	1″ – 1.2″
368-268	1.2″ – 1.6″
368-269	1.6″ – 2″
368-270	2″ – 2.5″			952623 (150mm)
368-271	2.5″ – 3″
368-272	3″ – 3.5″
368-273	3.5″ – 4″
368-274	4″ – 5″		±.00025″ (within .00025″)
368-275	5″ – 6″
368-276	6″ – 7″
368-277	7″ – 8″
368-278	8″ – 9″
368-279	9″ – 10″
368-280	10″ – 11″
368-281	11″ – 12″

*1 Excluding quantizing error.
Accuracy: values measured across the entire measuring face.
Maximum difference: differences between the maximum and minimum values.
* Setting ring and extension rod:
* It is not advisable to use measuring heads other than as supplied as a standard accessory, or widen a measuring range by using any other multiple sub-measuring (The measuring accuracy in such cases is not guaranteed.)

DIMENSIONS

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

External appearance differs depending on the measuring range.

Two point Internal Micrometers

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

External appearance differs depending on the measuring range.

Two point Internal Micrometers

Application using an extension rod
For details of Special-order Products, refer to page C-49.

Titanium-coated measuring pins on the three- point type (over 6mm range models) provide excellent durability and impact resistance and allow the instrument to measure right to the bottom of a blind
Three-point bore micrometer with measuring range 6mm or longer allows stable measurement through automatic

Can measure deep holes using an Extension rod (optional) which is available on models over 6mm (.275″) measuring
Ratchet Stop ensures constant-force, repeatable measurement.
Setting Rings for accurately setting the instrument are optional. Refer to page C-47 for details.