Analogue Bore Gauges 

Bowers XT Analogue Bore gauges are an economical solution to accurate shop-floor bore measurement. The extended mechanical travel of these advanced two or three point gauges ensures that exchanging measuring anvils is now unnecessary. Their wide application range, 2-300mm, rugged construction and easy read scale, ensure both accuracy and ease of use. XT measuring heads and setting rings are supplied with UKAS certification. 
Bowers has launched the new XTA Micro to cover the measuring range 2-20mm. The XTA Micro incorporates a more compact mechanical controller and Vernier scale for improved resolution. 
Analogue Bore Gauge
Features 
Range 2-300mm (0.080"-12") 
2-6mm 2 point/6-300mm 3 point measurement 
Graduation XTA Micro 2-6mm: 0.001mm, 6-20mm: 0.002mm 
Graduation XTA Micro 0.080" -1/4": 0.0001", 1/4"- 3/4": 0.0001" 
Graduation XTA 20-300mm: 0.005mm 
Tungsten carbide measuring faces on all 3-point heads from 12.5mm 
Blind bore measurement from 2mm-6mm and above 12.5mm (0.500") 
Extensions availble above 6mm for deep hole measurement 
Ratchet stop to ensure consistent measurement 
Setting rings included with individual instruments and sets 
UKAS certificates supplied as standard with all setting rings 
UKAS certificates supplied as standard with all XT mechanical gauges 
Serial number on all gauges 
Bore gauges manufactured accoring to DIN 863, part 4 
Supplied in fitted wooden case 

XTA MICRO: Individual instruments supplied with setting ring and UKAS Metric 

Code No 
 
Code No  
(without ring) 
Range (mm) 
 
2-2.5 
2.5-3 
3-4 
4-5 
5-6 
6-8 
8-10 
10-12.5 
12.5-16 
16-20 
Accuracy (mm) 
 
0.004 
0.004 
0.004 
0.004 
0.004 
0.004 
0.004 
0.004 
0.004 
0.004 
Depth (mm) 
 
12 
18 
18 
58 
58 
58 
62 
62 
Setting Ring (mm) 
 
2.50 
2.50 
4.00 
4.00 
5.00 
8.00 
8.00 
12.50 
12.50 
20.00 

Imperial 

Range (inch) 
0.080-0.100 
0.100-0.120 
0.120-0.160 
0.160-0.200 
0.200-0.250 
1/4-5/16 
5/16-3/8 
3/8-1/2 
1/2-5/8 
5/8-3/4 
Accuracy (inch) 
0.00015 
0.00015 
0.00015 
0.00015 
0.00015 
0.00015 
0.00015 
0.00015 
0.00015 
0.00015 
Depth (inch) 
0.35 
0.35 
0.47 
0.70 
0.70 
2.28 
2.28 
2.28 
2.44 
2.44 
Setting Ring (inch) 
0.1000 
0.1000 
0.1600 
0.1600 
0.2000 
0.3125 
0.3125 
0.500 
0.500 
0.750 

XTA STANDARD: Individual instruments supplied with setting ring and UKAS 

Range (mm) 
20-25 
25-35 
35-50 
50-65 
65-80 
80-100 
100-125 
125-150 
150-175 
175-200 
200-225 
225-250 
250-275 
275-300 
Accuracy (mm) 
0.004 
0.004 
0.004 
0.005 
0.005 
0.005 
0.006 
0.006 
0.007 
0.007 
0.008 
0.008 
0.009 
0.009 
Depth (mm) 
66 
66 
80 
80 
80 
100 
115 
115 
115 
115 
118 
118 
118 
118 
Setting Ring (mm) 
20.00 
35.00 
35.00 
65.00 
65.00 
80.00 
125.00 
125.00 
175.00 
175.00 
225.00 
225.00 
275.00 
275.00 
Range (inch) 
3/4-1 
1-1 3/8 
1 3/8-2 
2-2 5/8 
2 5/8-3 1/4 
3 1/4-4 
4-5 
5-6 
6-7 
7-8 
8-9 
9-10 
10-11 
11-12 
Accuracy (inch) 
0.00015 
0.00015 
0.00015 
0.00020 
0.00020 
0.00020 
0.00025 
0.00025 
0.00030 
0.00030 
0.00030 
0.00030 
0.00035 
0.00035 
Depth (inch) 
2.62 
2.62 
3.15 
3.15 
3.15 
3.94 
4.53 
4.53 
4.53 
4.53 
4.65 
4.65 
4.65 
4.65 
Setting Ring (inch) 
0.750 
1.375 
1.375 
2.625 
2.625 
3.250 
5.000 
5.000 
7.000 
7.000 
9.000 
1.375 
11.000 
11.000 

XTA MICRO SETS: Supplied with individual instrument, setting rings and UKAS 

Code No 
 
Code No  
(Without Ring) 
Range (mm) 
 
2-3 
3-6 
6-10 
10-20 
Measuring heads 
Setting rings 
 
Code No 
 
SMXTA1i 
SMXTA2i 
SMXTA3i 
SMXTA4i 
Range (inch) 
 
0.080-0.120 
0.120-0.250 
1/4-3/8 
3/8-3/4 

XT SETTING RINGS 

Setting Ring (mm) 
2.5 
4.00 
5.00 
8.00 
12.50 
20.00 
35.00 
65.00 
80.00 
125.00 
175.00 
225.00 
275.00 
Setting Ring (inch) 
0.1000 
0.1600 
0.2000 
0.3125 
0.500 
0.750 
1.375 
2.625 
3.250 
5.000 
7.000 
9.000 
11.000 

XTA STANDARD SETS: Supplied with individual instrument, setting rings and UKAS 

Code No 
Range (mm) 
20-50 
50-100 
100-150 
150-200 
Measuring Heads 
Setting Rings 
Code No 
Range (inch) 
3/4-2 
2-4 
4-6 
6-8 

EXTENSIONS 

Code No 
Length (mm) 
63 
76 
100 
150 
150 
Length (inch) 
2.5 
3.0 
4.0 
6.0 
6.0 
To Fit Heads (mm) 
6-10 
10-12.5 
12.5-20 
20-50 
50-300 
To Fit Heads (inch) 
1/4-3/8 
3/8-1/2 
1/2-3/4 
3/4-2 
2-12 
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