Ingersoll Rand/Aro 8255-172-1 Self-Feed Drill Unit

Ingersoll Rand/Aro 8255-172-1 Self-Feed Drill Unit

Par-A-Matic® Series Drill Unit

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ARO Par-A-Matic Drills provide the selection, performance, and degree of precision to automate a wide range of secondary machining applications simply and economically. They utilize compressed air for both the spindle rotation and feed / control functions. The reliable rotary-vane air motor offers high power-to-size performance which minimizes tool size and weight for added machine design flexibility. The tools are easily installed, requiring only simple pneumatic circuitry. They can be used individually or in conjunction with other ARO electric and pneumatic tools.


Additional features / benefits include—

• Built-in four-way valve enables both manual and remote


• Double-acting air piston provides smooth, controlled forward

and retract strokes.

• Needle valve controls allows adjustment of forward and

retract strokes.

• Adjustment screw provides infinite stroke length settings.

• Ball bearing spindle support offers precision and long

service life.

• Muffled exhaust for a quieter work environment.


  • Stroke 1.25"
  • Std. Chuck Capacity 5/16"
  • HP .50
  • RPM 17,000
  • Sound Level dB(A) 74
  • Thrust @ 90 PSI lb. (N) 170 (756)