Dial Indicators
• The one revolution dial indicator (back plunger type) prevents the possibility of reading errors. • Back plunger type dial indicators are suitable for mounting onto leveling machine tool tables or inspection jigs, and for use in situations where standard dial indicators are difficult to read. • Proprietry Mitutoyo shockproof mechanism provides excellent durability and shock resistance. Back Plunger Type Dial Indicators SERIES 2
Holding bar
• Model 2990A-10 provides 0.001 mm graduation. • The red dead zone in the middle of the dial face is
separated from the bezel and doesn't cover the graduations. Therefore, users can always see the range where accuracy is not guaranteed even if the bezel is rotated.
2960A
SPECIFICATIONS Inch
Holding bar (optional) Order No. øD (mm)
ANSI/AGD type
ISO/JIS type
Stem ø3/8", #4-48 UNF
L (mm)
Range (range / rev) (in)
Accuracy (in)
21AAA166
ø6 ø6
42 81 81 42 42
Graduation (in)
Dial reading
Measuring force (N)
Order No.
Repeatbility (in)
First 1 Rev/2.5 Rev/10 Rev
Retrace
136567 124625
ø6.35 ø6.35
2961A
0.0005 0.04 (0.05) 0.0001 0.008 (0.01)
±0.0005/—/— 0.00016 ±0.0002/—/— 0.0001
±0.0001 20-0-20 1.4 or less ±0.00005 4-0-4 1.5 or less
21AAA167 21AAA168
2991A-10
ø8 ø8
Metric
Stem ø8mm, M2.5x0.45 Thread
136568 81 Note: øD and L: detail shown in drawing below.
Accuracy (µm)
Range (range / rev) (mm)
Repeat- ability
Graduation (mm)
Dial reading
Measuring force (N)
F
Order No.
Hysteresis
Measuring range
1/10 Rev 1/2 Rev 1 Rev
Optional Accessory • Limit hand (2 pcs.) Refer to page F-41 for details.
2960A
0.01
1 (1.27)
8
— — 14 — — 5
4 2
3 50-0-50 1.4 or less 1 50-0-50 1.5 or less
2990A-10
0.001 0.1 (0.14)
2.5
Note 1: The bezel clamp cannot be used.
DIMENSIONS
2961A
2991A-10
ANSI/AGD Type
Unit: in
ø2.24
ø2.24
Holding bar (optional)
Holding bar (optional) (ø0.24 Only)
ø2.28
L
L
ø0.375 0
-0.0012
ø0.375 0
-0.0012
ø0.16
ø0.16
Ball contact (ø0.12) 21BZB056 (thread: No. 4-48 UNF)
Ball contact (ø0.12) 21BZB005 (thread: No. 4-48 UNF)
0.86
ø1.38
1.00
ø2.01
2960A
2990A-10
Unit: mm
ISO/JIS Type
Holding bar (optional)
ø57
ø57
Holding bar (optional) (ø6 only)
ø58
L
ø8 0
L
-0.009
ø4
ø8 0
-0.009
ø4
21.8
ø35
25.5
M2.5×0.45
M2.5×0.45
Upon request, we can manufacture custom types with changed graduation numbers, graduation lines, dead zones, etc. Please contact your nearest M³ Solution Center for more information. Special specifications
ø51
Note 1: The shoulder on a contact point (standard accessory) for 2960A and 2961A acts as a stop to prevent spindle overrun that may otherwise damage the indicator. When replacing it with an optional contact point with a connector not exceeding ø7 mm in outside diameter, insert a washer (with ø7 mm outside diameter, ø3 mm inside diameter, and approximately 0.5 mm thickness) above the contact point. Note 2: Refer to pages F-63 to F-68 for details of contact points.
F-58
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