Ingersoll Rand 8255-A50-2 Self-Feed Air Drill | 5/16" Capacity | 0.5 HP | 5,000 RPM | Single Gear Reduction

Ingersoll Rand 8255-A50-2 is a Par-A-Matic Series Self-Feed Air Drill built for repetitive production drilling and secondary machining where controlled spindle feed and retract movement are important. This model combines a 0.50 HP (.37 kW) pneumatic motor with a 5,000 RPM free speed and single gear reduction. The -2 configuration provides a 2 in. (51 mm) stroke, giving fixture builders additional spindle travel for drilling cycles that require more than the standard 1-1/4 in. stroke.

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

Type: Self-Feed Air Drill | Series: Par-A-Matic | Model: 8255-A50-2 | Capacity: 5/16 in. Steel | Motor Power: 0.50 HP (.37 kW) | Free Speed: 5,000 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) | Standard Chuck Capacity: 5/16 in. (7.9 mm) | Nominal Steel Drilling Capacity: 5/64 in. (2.0 mm) SAE 1213 | Nominal Aluminum Drilling Capacity: 3/16 in. (4.8 mm) 2024-T4 | Nominal Wood/FRP Drilling Capacity: 3/16 in. (4.8 mm)

Features:

• The built-in four-way valve enables both manual and remote operation.
• The double-acting air piston provides smooth, controlled forward and retract strokes.
• Needle valve controls allow adjustment of forward and retract strokes.
• The adjustment screw provides infinite stroke-length settings.
• Ball bearing spindle support offers precision spindle guidance.
• The muffled exhaust helps provide a quieter work environment.
• Single gear reduction provides the specified drive configuration for the 5,000 RPM model.
• The 2 in. stroke provides additional spindle travel for compatible production fixtures.

NON-RETURNABLE. MADE TO ORDER.

Applications:

• Production machining — performing repeatable drilling cycles where controlled pneumatic feed and retract movement are required.
• Fixture-mounted drilling — integrating the drill into dedicated fixtures where the 2 in. stroke provides the required spindle travel.
• Metal fabrication — drilling SAE 1213 steel within the manufacturer's nominal material capacity.
• Vehicle component manufacturing — performing repeatable holes in components such as brackets, mounts, hinges, and related fabricated parts where the tooling and material ratings are appropriate.
• Automated secondary machining — using the four-way valve for manual or remote operation in suitable pneumatic production systems.

FAQs:

• Q: What is the free speed of the 8255-A50-2?
  A: The 8255-A50-2 has a 5,000 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-A50 model family.
• Q: What does single gear reduction mean?
  A: It identifies the single gear reduction configuration used in the spindle drive of this 5,000 RPM model.
• Q: What is the difference between chuck capacity and drilling capacity?
  A: Chuck capacity identifies the tooling interface. For this model, the standard chuck capacity is 5/16 in., while the manufacturer's nominal drilling capacity varies by material, including 5/64 in. in SAE 1213 steel.
• Q: What thrust does this self-feed drill provide?
  A: The manufacturer specifies 170 lb (756 N) thrust at 90 PSI.
• Q: How much air does the drill consume?
  A: Air consumption is specified at 2.3 ft³/cycle (65 L/cycle) at working speed.
• Q: Can the 8255-A50-2 be operated remotely?
  A: Yes. The built-in four-way valve enables both manual and remote operation.
• Q: What materials are listed for the nominal drilling capacities?
  A: The manufacturer lists 5/64 in. (2.0 mm) in SAE 1213 steel, 3/16 in. (4.8 mm) in 2024-T4 aluminum, and 3/16 in. (4.8 mm) in wood, medium or FRP. Stainless-steel capacity is not listed for this model.

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For help choosing the correct Ingersoll Rand Self-Feed Air Drills for your application, please call (800) 608-5210 or email info@intlairtool.com