A-516 Self-Centering, 2-Axis Target 20×20 mm with Wheeled Measuring Feet – DISCONTINUED

A-516 Self-Centering, 2-Axis Target 20×20 mm with Wheeled Measuring Feet – DISCONTINUED



The A-516 Target is a 2-axis, self-centering target with wheeled measuring tips, designed for deep-bore, large-diameter bore straightness applications, such as gun barrels and hydraulic cylinders. It can measure bores as small as 3.25 in. (82.6 mm) and as large as 16 in. (406.4 mm) for straightness and alignment.

With a 20×20 mm PSD, it has a very large measuring range for large straightness errors typically seen in long cylinders. The wheeled measuring tips make it extremely easy to insert the target into the bore and push deep into the cylinder.

An accelerometer on the A-516 keeps track of the rotational position and allows the user to keep the target at top dead center. A scale is imprinted on the insertion pole so it is easy keep track of each measurement point. Use with Bore9 Software to collect the data and calculate the straightness.”


  • Straightness checks on gun barrels and cylinders.


  • 20×20 mm PSD, (position sensing device) with .0001 in. (0.001 mm) resolution (with R-1307+R Readout) and < 1% linearity.
  • Built-in, self-centering adapter that uses measuring legs with roller bearing tips for easy insertion into very deep bores.
  • Can perform straightness checks on gun barrels or cylinders up to 33 feet (10 meters) long.
  • For bores from 3.25 in. (82.6 mm) to 16 in. (406.4 mm).
  • Quick-connect poles with measuring scale have an distance-measuring accuracy to ± 5 mm.
  • Accelerometer helps to keep the target in the same rotational orientation for better accuracy.
  • Supports our R-1307BC+R 2-Axis Readout.
  • Use with Bore9 Software to record alignment data, calculate the straightness and plot the alignment data points.


1.7 lbs. (.78 kg)
440C Stainless Steel
Target Cell Resolution:
.0001 in. (0.001 mm) when used with the R-1307 .00004 in. (0.001 mm) when used with the Bore9 software
Target Cell Error:
<0.5% over the effective measuring range
Bore Diameter 
3.25 in. (82.6 mm) to 16 in. (406.4 mm). Each bore requires 1 set of A-516CLR measuring legs.
PSD Size and Type:
.79 x .79 inches (20 x 20 mm) 2-axis super linear
Measuring Range (L-705, L-706, L-708):
± .30 inches (7.5 mm)
Measuring Range
± .10 inches (2.5 mm)
Resolution: 0.1 degree Accuracy: ±1.0 degrees
Cord Dimensions:
33 feet (10 m)
Target Housing OD:
2.5 in. (63.5 mm)
PSD Concentricity to Housing:
.0005 in. (0.01 mm)
Measuring Tape
 Accuracy on
 A-510E Insertion
± 5 mm