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. 
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 
 
MXTA1M 
MXTA2M 
MXTA3M 
MXTA4M 
MXTA5M 
MXTA6M 
MXTA8M 
MXTA10M 
MXTA12M 
MXTA16M 
Code No  
(without ring) 
MXTA1W 
MXTA2W 
MXTA3W 
MXTA4W 
MXTA5W 
MXTA6W 
MXTA8W 
MXTA10W 
MXTA12W 
MXTA16W 
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 

Code No 
MXTA1i 
MXTA2i 
MXTA3i 
MXTA4i 
MXTA5i 
MXTA6i 
MXTA8i 
MXTA10i 
MXTA12i 
MXTA16i 
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 

Code No 
XTA20M 
XTA25M 
XTA35M 
XTA50M 
XTA65M 
XTA80M 
XTA100M 
XTA125M 
XTA150M 
XTA175M 
XTA200M 
XTA225M 
XTA250M 
XTA275M 
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 
Code No 
XTA20i 
XTA25i 
XTA35i 
XTA50i 
XTA65i 
XTA80i 
XTA100i 
XTA125i 
XTA150i 
XTA175i 
XTA200i 
XTA225i 
XTA250i 
XTA275i 
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 
 
SMXTA1M 
SMXTA2M 
SMXTA3M 
SMXTA4M 
Code No  
(Without Ring) 
SMXTA1W 
SMXTA2W 
SMXTA3W 
SMXTA4W 
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 

Code No 
XTR3M 
XTR5M 
XTR7M 
XTR8M 
XTR12M 
XTR20M 
XTR35M 
XTR65M 
XTR80M 
XTF125M 
XTF175M 
XTR225 
XTR275M 
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 
Code No 
XTR3i 
XTR5i 
XTR7i 
XTR8i 
XTR12i 
XTR20i 
XTR35i 
XTR65i 
XTR80i 
XTR125i 
XTR175i 
XTR225i 
XTR275i 
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 
SXTA5M 
SXTA6M 
SXTA7M 
SXTA8M 
Range (mm) 
20-50 
50-100 
100-150 
150-200 
Measuring Heads 
Setting Rings 
Code No 
SXTA5i 
SXTA6i 
SXTA7i 
SXTA8i 
Range (inch) 
3/4-2 
2-4 
4-6 
6-8 

EXTENSIONS 

Code No 
EGX0200 
EGX0400 
EGX0500 
EGX0001 
EGX0004 
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