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.
| SKU | Stroke Lengths in (mm) | Free Speed rpm | Stainless Steel Type 304 | Steel SAE 1213 | Aluminum 2024-T4 | Wood Med. or FRP | Thrust @ 90psi lbs (N) | Air Consp.† at Working Speed ft³/cycle (L/cycle) | Sound Level dBa | Standard Chuck Capacity in (mm) | Gear Reduction |
|---|---|---|---|---|---|---|---|---|---|---|---|
| PAR-A-MATIC SERIES | |||||||||||
| 8255-172-2 | 2.0" (51) | 17,000 | — | 1/64 (0.4) | 1/32 (0.8) | 1/16 (1.6) | Single | ||||
| 8255-101-2 | 2.0" (51) | 10,000 | — | 1/32 (0.8) | 1/16 (1.6) | 5/32 (4.0) | Double | ||||
| 8255-A50-2 | 2.0" (51) | 5,000 | — | 5/64 (2.0) | 3/16 (4.8) | 3/16 (4.8) | Single | ||||
| 8255-A28-2 | 2.0" (51) | 2,800 | 1/16 (1.6) | 9/64 (3.6) | 1/4 (6.4) | 1/4 (6.4) | Single | ||||
| 8255-A21-2 | 2.0" (51) | 2,100 | 7/64 (2.8) | 7/32 (5.6) | 9/32 (7.1) | 5/16 (7.9) | 170 (756) | 2.3 (65) | 74 | 5/16 (79) | Single |
| 8255-A14-2 | 2.0" (51) | 1,450 | 5/32 (4.0) | 1/4 (6.4) | 5/16 (7.9) | 3/8 (9.5) | Double | ||||
| 8255-A8-2 | 2.0" (51) | 850 | 11/64 (4.4) | 9/32 (7.1) | 21/64 (8.3) | 25/64 (9.9) | Double | ||||
| 8255-A5-2 | 2.0" (51) | 500 | 1/4 (6.4) | 5/16 (7.9) | 11/32 (8.7) | 13/32 (10.3) | Double | ||||
| 8255-172-3 | 3.0" (76) | 17,000 | — | 1/64 (0.4) | 1/32 (0.8) | 1/16 (1.6) | Single | ||||
| 8255-101-3 | 3.0" (76) | 10,000 | — | 1/32 (0.8) | 1/16 (1.6) | 5/32 (4.0) | Double | ||||
| 8255-A50-3 | 3.0" (76) | 5,000 | — | 5/64 (2.0) | 3/16 (4.8) | 3/16 (4.8) | Single | ||||
| 8255-A28-3 | 3.0" (76) | 2,800 | 1/16 (1.6) | 9/64 (3.6) | 1/4 (6.4) | 1/4 (6.4) | Single | ||||
| 8255-A21-3 | 3.0" (76) | 2,100 | 7/64 (2.8) | 7/32 (5.6) | 9/32 (7.1) | 5/16 (7.9) | 170 (756) | 2.3 (65) | 74 | 5/16 (79) | Single |
| 8255-A14-3 | 3.0" (76) | 1,450 | 5/32 (4.0) | 1/4 (6.4) | 5/16 (7.9) | 3/8 (9.5) | Double | ||||
| 8255-A8-3 | 3.0" (76) | 850 | 11/64 (4.4) | 9/32 (7.1) | 21/64 (8.3) | 25/64 (9.9) | Double | ||||
| 8255-A5-3 | 3.0" (76) | 500 | 1/4 (6.4) | 5/16 (7.9) | 11/32 (8.7) | 13/32 (10.3) | Double | ||||
| SUPER PAR-A-MATIC SERIES | |||||||||||
| 8265-171-1 | 1-1/2" (38) | 17,000 | — | 1/64 (0.4) | 3/32 (2.4) | 3/32 (2.4) | Single | ||||
| 8265-101-1 | 1-1/2" (38) | 10,000 | — | 3/64 (1.2) | 5/32 (4.0) | 5/32 (4.0) | Double | ||||
| 8265-46-1 | 1-1/2" (38) | 4,600 | — | 1/8 (3.2) | 1/4 (6.4) | 5/16 (7.9) | Single | ||||
| 8265-25-1 | 1-1/2" (38) | 2,500 | 3/32 (2.4) | 3/16 (4.8) | 5/16 (7.9) | 7/16 (11.1) | 250 (1112) | 2.9 (82) | 77 | 1/2 (12.7) | Single |
| 8265-12-1 | 1-1/2" (38) | 1,200 | 5/32 (4.0) | 5/16 (7.9) | 3/8 (9.5) | 9/16 (14.3) | Double | ||||
| 8265-6-1 | 1-1/2" (38) | 650 | 17/64 (6.7) | 7/16 (11.1) | 9/16 (14.3) | 5/8 (15.9) | Double | ||||
| 8265-3-1 | 1-1/2" (38) | 350 | 5/16 (7.9) | 1/2 (12.7) | 5/8 (15.9) | 11/16 (17.5) | Double | ||||
| 8265-171-3 | 3.0" (76) | 17,000 | — | 1/64 (0.4) | 3/32 (2.4) | 3/32 (2.4) | Single | ||||
| 8265-101-3 | 3.0" (76) | 10,000 | — | 3/64 (1.2) | 5/32 (4.0) | 5/32 (4.0) | Double | ||||
| 8265-46-3 | 3.0" (76) | 4,600 | — | 1/8 (3.2) | 1/4 (6.4) | 5/16 (7.9) | Single | ||||
| 8265-25-3 | 3.0" (76) | 2,500 | 3/32 (2.4) | 3/16 (4.8) | 5/16 (7.9) | 7/16 (11.1) | 250 (1112) | 2.9 (82) | 77 | 1/2 (12.7) | Single |
| 8265-12-3 | 3.0" (76) | 1,200 | 5/32 (4.0) | 5/16 (7.9) | 3/8 (9.5) | 9/16 (14.3) | Double | ||||
| 8265-6-3 | 3.0" (76) | 650 | 17/64 (6.7) | 7/16 (11.1) | 9/16 (14.3) | 5/8 (15.9) | Double | ||||
| 8265-3-3 | 3.0" (76) | 350 | 5/16 (7.9) | 1/2 (12.7) | 5/8 (15.9) | 11/16 (17.5) | Double | ||||
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