Ingersoll Rand 8255-172-2 Self-Feed Air Drill | 5/16" Capacity | 0.5 HP | 17,000 RPM | Single Gear Reduction

Ingersoll Rand 8255-172-2 is a Par-A-Matic Series Self-Feed Air Drill designed for automated and fixture-mounted drilling applications requiring controlled spindle feed and retract movement. This model combines a 0.50 HP (.37 kW) pneumatic motor with a 17,000 RPM free speed and single gear reduction. The -2 configuration provides a 2 in. (51 mm) stroke, giving production equipment additional spindle travel compared with the 1-1/4 in. version. The model uses a 5/16 in. (7.9 mm) standard chuck; its nominal drilling capacity in SAE 1213 steel is 1/64 in. (0.4 mm).

The Par-A-Matic self-feed system uses compressed air for spindle rotation and feed/control functions. A double-acting air piston provides controlled forward and retract strokes, while needle-valve controls allow adjustment of those movements. The adjustment screw provides infinite stroke-length settings, and the built-in four-way valve permits both manual and remote operation. Ball-bearing spindle support provides precision spindle guidance, while the muffled exhaust helps reduce operating noise. The manufacturer specifies 170 lb (756 N) thrust at 90 PSI, 2.3 ft³/cycle (65 L/cycle) air consumption at working speed, and a 74 dB(A) sound level.

Type: Self-Feed Air Drill | Series: Par-A-Matic | Model: 8255-172-2 | Chuck Capacity: 5/16 in. (7.9 mm) | Motor Power: 0.50 HP (.37 kW) | Free Speed: 17,000 RPM | Gear Reduction: Single | Stroke Length: 2 in. (51 mm) | Thrust: 170 lb (756 N) at 90 PSI | Air Consumption: 2.3 ft³/cycle (65 L/cycle) at working speed | Sound Level: 74 dB(A) | Steel Drilling Capacity: 1/64 in. (0.4 mm) SAE 1213 | Air Inlet: 1/4 in. NPT Male | Control Ports: 1/8 in. NPTF Female | Spindle Thread: 1/2"-20 Male | Recommended Hose I.D.: 5/16 in. | Recommended Operating Pressure: 90 PSI (6.2 bar)

Features:

• The self-feed configuration provides controlled forward and retract movement for repeatable drilling cycles.
• The 0.50 HP pneumatic motor provides spindle power for high-speed drilling operations.
• Single gear reduction provides the drive configuration specified for the 17,000 RPM model.
• The double-acting air piston provides smooth, controlled forward and retract strokes.
• Needle-valve controls allow adjustment of the forward and retract strokes.
• The adjustment screw provides infinite stroke-length settings for application-specific feed travel.
• The built-in four-way valve permits both manual and remote operation.
• Ball-bearing spindle support provides precision spindle guidance and long service life.
• The muffled exhaust helps provide a quieter work environment during pneumatic operation.
• The 2 in. stroke provides additional spindle travel for compatible production fixtures and drilling equipment.

NON-RETURNABLE. MADE TO ORDER.

Applications:

• Automated drilling — performing controlled drilling cycles in suitable pneumatic production equipment.
• Fixture-mounted machining — integrating the drill into dedicated fixtures where a 2 in. stroke is required.
• High-speed small-hole drilling — performing small-diameter drilling operations at the model's specified 17,000 RPM free speed.
• Secondary machining — adding repeatable drilling operations to manufacturing equipment without continuous manual feed control.
• Production machinery — using manual or remote pneumatic control through the built-in four-way valve.

FAQs:

• Q: What is the free speed of the 8255-172-2?
  A: The 8255-172-2 has a 17,000 RPM free speed.
• Q: What does the “-2” suffix indicate?
  A: The -2 configuration identifies the 2 in. (51 mm) stroke version of the 8255-172 model family.
• Q: What does single gear reduction mean?
  A: It identifies the single gear reduction configuration used in the spindle drive of this 17,000 RPM model.
• Q: Is the 5/16 in. capacity the drilling capacity?
  A: The 5/16 in. specification refers to the standard chuck capacity. The manufacturer's nominal drilling capacity for SAE 1213 steel is 1/64 in. (0.4 mm) for the 8255-172 configuration.
• Q: How much thrust does the 8255-172-2 provide?
  A: The manufacturer specifies 170 lb (756 N) thrust at 90 PSI.
• Q: What is the air consumption?
  A: Air consumption is specified at 2.3 ft³/cycle (65 L/cycle) at working speed.
• Q: Can the 8255-172-2 be operated remotely?
  A: Yes. The built-in four-way valve permits both manual and remote operation.
• Q: What air connection does this model use?
  A: The listed configuration uses a 1/4 in. NPT male air inlet, 1/8 in. NPTF female control ports, and a recommended 5/16 in. hose I.D.
• Q: What is the difference between the 8255-172-1 and 8255-172-2?
  A: Both models use the 17,000 RPM single-reduction configuration, but the -1 version has a 1-1/4 in. stroke while the -2 version has a 2 in. stroke.

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