A-221STA Small-Bore, Self-Centering Target Adapter Hub for A-221 Target – 1.18-3.5 in. (30-90 mm) Bores


Small Bore, Self-Centering Bore Adapter Hub for 1.18-3.5 in. (30 to 90 mm) Bores. Used with A-221 Small-Bore 2-Axis Target.  Requires a set of replaceable M-221CLS-II Customized Measuring Legs to self-center the A-221 bore target. M-221CLS-II legs are customized to 1 bore ID.  Self-centers A-221 Target into a bore to measure straightness/alignment.  Takes about 5 seconds to get a measurement.


  • Cylinders
  • Single-barrel extruders
  • Twin-barrel extruders


  • Customized measuring legs machined to a specific length for 1 extruder bore.
  • Measuring Legs insert quickly into A-221STA for easy assembly and fast alignments.
  • Self-centers the A-221 Target into the bore to .0005 in. (0.013 mm) accurcy.
  • Takes 5 seconds to take a bore alignment measurement.