Ingersoll Rand 8255-A21-1 Self-Feed Air Drill | 5/16" Capacity | .05 HP | 2,100 RPM | Single Gear Reduction

Ingersoll Rand 8255-A21-1 is a Par-A-Matic Series Self-Feed Air Drill designed for repetitive production drilling and fixture-mounted machining where controlled spindle feed and retract movement are required. This model combines a 0.50 HP (.37 kW) pneumatic motor with a 2,100 RPM free speed and single gear reduction. The -1 configuration provides a 1-1/4 in. (32 mm) stroke, making it suitable for production fixtures requiring controlled and repeatable spindle travel. The manufacturer specification lists material-specific drilling capacities of 7/64 in. in Type 304 stainless steel, 7/32 in. in SAE 1213 steel, 9/32 in. in 2024-T4 aluminum, and 5/16 in. in wood, medium or FRP.

The Par-A-Matic self-feed system uses a double-acting air piston for controlled forward and retract strokes. Needle-valve controls allow adjustment of the forward and retract movement, while the adjustment screw provides infinite stroke-length settings. A built-in four-way valve permits manual or remote operation, allowing the drill to be integrated into suitable production equipment. Ball-bearing spindle support provides precision spindle guidance, while the muffled exhaust helps provide a quieter operating environment. The manufacturer lists 170 lb (756 N) thrust at 90 PSI, 2.3 ft³/cycle (65 L/cycle) air consumption at working speed, a 74 dB(A) sound level, and a 5/16 in. (7.9 mm) standard chuck capacity.

Type: Self-Feed Air Drill | Series: Par-A-Matic | Model: 8255-A21-1 | Capacity: 5/16 in. | Motor Power: 0.50 HP (.37 kW) | Free Speed: 2,100 RPM | Gear Reduction: Single | Stroke Length: 1-1/4 in. (32 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) | Air Inlet: 1/4 in. NPT | 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 supplies spindle power for the drilling operation.
• Single gear reduction provides the drive configuration specified for the 2,100 RPM model.
• The double-acting air piston provides 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 controlled feed travel.
• The built-in four-way valve permits both manual and remote operation.
• Ball-bearing spindle support provides precision spindle guidance.
• The muffled exhaust helps provide a quieter work environment during pneumatic operation.
• The 5/16 in. standard chuck accommodates compatible drill tooling within the manufacturer's specified capacity.

NON-RETURNABLE. MADE TO ORDER.

Applications:

• Production drilling — performing repeatable drilling cycles where controlled pneumatic feed and retract movement are required.
• Fixture-mounted machining — integrating the drill into dedicated production fixtures where the 1-1/4 in. stroke matches the required spindle travel.
• Secondary machining — adding controlled drilling cycles to manufacturing equipment without continuous manual feed control.
• Metalworking — drilling compatible materials within the manufacturer's material-specific capacity ratings.
• Automated drilling equipment — using the built-in four-way valve for manual or remote operation in suitable pneumatic control systems.

FAQs:

• Q: What is the correct motor power for the 8255-A21-1?
  A: The correct motor rating is 0.50 HP (.37 kW). The supplied title shows “.05 HP,” which is inconsistent with the manufacturer specification and should be corrected to 0.50 HP.
• Q: What is the free speed of the 8255-A21-1?
  A: The 8255-A21-1 has a 2,100 RPM free speed.
• Q: What does the “-1” suffix indicate?
  A: The -1 configuration identifies the 1-1/4 in. (32 mm) stroke version of the 8255-A21 model family.
• Q: What does single gear reduction mean?
  A: It identifies the single gear reduction configuration used in the spindle drive of this 2,100 RPM model.
• Q: What are the material-specific drilling capacities?
  A: The manufacturer lists 7/64 in. (2.8 mm) in Type 304 stainless steel, 7/32 in. (5.6 mm) in SAE 1213 steel, 9/32 in. (7.1 mm) in 2024-T4 aluminum, and 5/16 in. (7.9 mm) in wood, medium or FRP.
• Q: How much thrust does this drill 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: What is the standard chuck capacity?
  A: The manufacturer lists a 5/16 in. (7.9 mm) standard chuck capacity.
• Q: Can the 8255-A21-1 be operated remotely?
  A: Yes. The built-in four-way valve permits both manual and remote operation.

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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