78XTZ-258 Starrett Internal Micrometer Bore Gage 2*-2-5/8*
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78XTZ-258
Starrett Bore Gage
2″ to 2-5/8″ range
The 78XT Series Internal Micrometers feature
extended travel, reducing the need to exchange
anvils . The ground contact points seat the
internal micrometer faster and more accurately
than the spherical contacts found in other gages .
These rugged and accurate internal micrometers
are available individually or in economical sets
from .040-12″ (1-300mm) .
Features
- Wide measurement range without
changing anvils - Resolution from .0001″ (0 .0025mm) on the 2-point contact tools ranging
up to 1/4″ (6mm) and .00025″ (0 .005mm) on the 3-point contact
tools ranging from 1/4″-12″ (6mm – 300mm) - Tungsten carbide measuring faces on all
3-point heads above 1/2″ (12 .5mm) - Ratchet stop ensures consistent
measurements - Self-centering contacts for true readings
- Blind bore measuring capability above
1/2″ (12 .5mm) diameter - Extensions available up to 6″ (150mm)
for deep hole measuring - Setting rings included
- Depth stop/collar also available for
.080″- .250″ (1-6mm) range - Each micrometer bore gage is furnished
in a case, complete with setting ring,
contacts, wrenches, and instructions
| 78XT Bore Gages, 2-Point Contact ( .080- .250″ Range) |
||||
|
Catalog No
|
Range
|
Accuracy
|
Approximate Measuring Depth
|
Setting Ring Diameter
|
|
Inches
|
Inches
|
Inches
|
Inches
|
|
|
78XTZ-100
|
.080- .100
|
.00010″
|
3/8
|
.100
|
|
78XTZ-120
|
.100- .120
|
|||
|
78XTZ-160
|
.120- .160
|
15/32
|
.160
|
|
|
78XTZ-200
|
.160- .200
|
3/4
|
.160
|
|
|
78XTZ-250
|
.200- .250
|
.200
|
||
| 78XT Bore Gages, 3-Point Contact (1/4-12″ Range) | ||||
|
78XTZ-312
|
1/4 – 5/16
|
.00015″
|
2-1/4
|
.3125
|
|
78XTZ-375
|
5/16 – 3/8
|
.3125
|
||
|
78XTZ-500
|
3/8 – 1/2
|
.500
|
||
|
78XTZ-625
|
1/2 – 5/8
|
2-7/16
|
.500
|
|
|
78XTZ-750
|
5/8 – 3/4
|
.750
|
||
|
78XTZ-1
|
3/4 – 1
|
2-5/8
|
.750
|
|
|
78XTZ-138
|
1 – 1-3/8
|
1 .375
|
||
|
78XTZ-2
|
1-3/8 – 2
|
3-1/16
|
1 .375
|
|
|
78XTZ-258
|
2 – 2-5/8
|
.00020″
|
2 .625
|
|
|
78XTZ-314
|
2-5/8 – 3-1/4 |
|||
|
78XTZ-4
|
3-1/4 – 4
|
4
|
3 .250
|
|
|
78XTZ-5
|
4-5
|
.00025″
|
5 .0
|
|
|
78XTZ-6
|
5-6
|
4-1/2
|
5 .0
|
|
|
78XTZ-7
|
6-7
|
.00030″
|
7 .0
|
|
|
78XTZ-8
|
7-8
|
7 .0
|
||
|
78XTZ-9
|
8-9
|
9 .0
|
||
|
78XTZ-10
|
9-10
|
“4-5/8
|
9 .0
|
|
|
78XTZ-11
|
10-11
|
.00025″
|
“4-5/8
|
11 .0
|
|
78XTZ-12
|
11-12
|
|||
| 78XT Sets, 2-Point Contact ( .250″ Range) | |||
|
Catalog No
|
Range
|
No . of Heads
|
No . of Rings
|
|
S78XTBZ
|
.120- .250″
|
3
|
2
|
| 78XT Sets, 3-Point Contact (1/4-4″ Range) | |||
|
S78XTCZ
|
1/4-3/8″
|
2
|
1
|
|
S78XTDZ
|
3/8-3/4″
|
3
|
2
|
|
S78XTEZ
|
3/4-2″
|
3
|
2
|
|
S78XTFZ
|
2-4″
|
3
|
2
|
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