Ingersoll Rand 8255-A28-1 is a Par-A-Matic Series Self-Feed Air Drill built 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 2,800 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 that require controlled and repeatable spindle travel. The Par-A-Matic series is identified with a 5/16 in. (7.9 mm) steel capacity and 5/16 in. standard chuck.
The 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 feed and retract movement. The adjustment screw provides infinite stroke-length settings, and the built-in four-way valve permits manual or remote operation. Ball-bearing spindle support provides precision spindle guidance, while the muffled exhaust helps reduce operating noise. The 8255-A28-1 provides 170 lb (756 N) thrust at 90 PSI, uses 2.3 ft³/cycle (65 L/cycle) of air at working speed, and has a 74 dB(A) sound level.
Type: Self-Feed Air Drill | Series: Par-A-Matic | Model: 8255-A28-1 | Capacity: 5/16 in. (7.9 mm), Steel | Motor Power: 0.50 HP (.37 kW) | Free Speed: 2,800 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 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 built-in four-way valve permits both manual and remote operation.
- 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 controlled feed travel.
- Ball-bearing spindle support provides precision spindle guidance.
- The muffled exhaust helps provide a quieter work environment during pneumatic operation.
- Single gear reduction provides the drive configuration specified for the 2,800 RPM model.
- 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 repetitive holemaking operations where controlled pneumatic feed and retract movement are required.
- Fixture-mounted machining — integrating the drill into dedicated production fixtures where a 1-1/4 in. stroke provides the required spindle travel.
- Metal fabrication — drilling compatible steel components within the manufacturer's material-specific capacity ratings.
- Secondary machining — adding repeatable drilling cycles to manufacturing equipment without continuous manual feed control.
- Automated drilling systems — 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-A28-1?
A: The correct rating is 0.50 HP (.37 kW). The supplied title shows “.05 HP,” which appears to be a typographical error and should not be published as the motor rating. - Q: What is the free speed of the 8255-A28-1?
A: The 8255-A28-1 has a 2,800 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-A28 model family. - Q: What does single gear reduction mean?
A: It identifies the single gear reduction configuration used in the spindle drive of this 2,800 RPM model. - Q: What are the material-specific drilling capacities?
A: The manufacturer lists 1/16 in. (1.6 mm) in Type 304 stainless steel, 9/64 in. (3.6 mm) in SAE 1213 steel, 1/4 in. (6.4 mm) in 2024-T4 aluminum, and 1/4 in. (6.4 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 standard chuck capacity?
A: The standard chuck capacity is 5/16 in. (7.9 mm). - Q: Can the 8255-A28-1 be operated remotely?
A: Yes. The built-in four-way valve permits both manual and remote operation.
| SKU | STROKE LENGTHS IN (MM) |
FREE SPEED RPM |
*NOMINAL DRILLING CAPACITIES | THRUST @ 90PSI LBS (N) |
AIR CONSP.‡ AT WORKING SPEED FT³/CYCLE (L/CYCLE) |
SOUND LEVEL DBA |
STANDARD CHUCK CAPACITY IN (MM) |
GEAR REDUCTION |
|||
|---|---|---|---|---|---|---|---|---|---|---|---|
| STAINLESS STEEL TYPE 304 |
STEEL SAE 1213 |
ALUMINUM 2024-T4 |
WOOD MED. OR FRP |
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| BANT-A-MATIC SERIES | |||||||||||
| 8245-203-1* | 1-1/4” (32) | 19,000 | — | 1/64 (0.4) | 1/32 (0.8) | 1/16 (1.6) | Single | ||||
| 8245-101-1 | 1-1/4” (32) | 10,000 | 1/64 (0.4) | 1/32 (0.8) | 1/16 (1.6) | 1/8 (3.2) | Double | ||||
| 8245-B45-1 | 1-1/4” (32) | 4,400 | 1/32 (0.8) | 1/16 (1.6) | 1/8 (3.2) | 5/32 (4.0) | 90 (400) | 1.5 (42) | 77 | 1/4 (6.4) | Single |
| 8245-B30-1 | 1-1/4” (32) | 2,700 | 1/16 (1.6) | 1/8 (3.2) | 3/16 (4.8) | 3/16 (4.8) | Single | ||||
| 8245-B8-1 | 1-1/4” (32) | 900 | 3/32 (2.4) | 3/16 (4.8) | 1/4 (6.4) | 5/16 (7.9) | Double | ||||
| 8245-203-2 | 2.0” (51) | 19,000 | — | 1/64 (0.4) | 1/32 (0.8) | 1/16 (1.6) | Single | ||||
| 8245-101-2 | 2.0” (51) | 10,000 | 1/64 (0.4) | 1/32 (0.8) | 1/16 (1.6) | 1/8 (3.2) | Double | ||||
| 8245-B45-2 | 2.0” (51) | 4,400 | 1/32 (0.8) | 1/16 (1.6) | 1/8 (3.2) | 5/32 (4.0) | 90 (400) | 1.5 (42) | 77 | 1/4 (6.4) | Single |
| 8245-B30-2 | 2.0” (51) | 2,700 | 1/16 (1.6) | 1/8 (3.2) | 3/16 (4.8) | 3/16 (4.8) | Single | ||||
| 8245-B8-2 | 2.0” (51) | 900 | 3/32 (2.4) | 3/16 (4.8) | 1/4 (6.4) | 5/16 (7.9) | Double | ||||
| 8245-203-3 | 3.0” (76) | 19,000 | — | 1/64 (0.4) | 1/32 (0.8) | 1/16 (1.6) | Single | ||||
| 8245-101-3 | 3.0” (76) | 10,000 | 1/64 (0.4) | 1/32 (0.8) | 1/16 (1.6) | 1/8 (3.2) | Double | ||||
| 8245-B45-3 | 3.0” (76) | 4,400 | 1/32 (0.8) | 1/16 (1.6) | 1/8 (3.2) | 5/32 (4.0) | 90 (400) | 1.5 (42) | 77 | 1/4 (6.4) | Single |
| 8245-B30-3 | 3.0” (76) | 2,700 | 1/16 (1.6) | 1/8 (3.2) | 3/16 (4.8) | 3/16 (4.8) | Single | ||||
| 8245-B8-3 | 3.0” (76) | 900 | 3/32 (2.4) | 3/16 (4.8) | 1/4 (6.4) | 5/16 (7.9) | Double | ||||
| PAR-A-MATIC SERIES | |||||||||||
| *8255-172-1 | 1-1/4” (32) | 17,000 | — | 1/64 (0.4) | 1/32 (0.8) | 1/16 (1.6) | Single | ||||
| 8255-101-1 | 1-1/4” (32) | 10,000 | — | 1/32 (0.8) | 1/16 (1.6) | 5/32 (4.0) | Double | ||||
| 8255-A50-1 | 1-1/4” (32) | 5,000 | — | 5/64 (2.0) | 3/16 (4.8) | 3/16 (4.8) | Single | ||||
| 8255-A28-1 | 1-1/4” (32) | 2,800 | 1/16 (1.6) | 9/64 (3.6) | 1/4 (6.4) | 1/4 (6.4) | Single | ||||
| 8255-A21-1 | 1-1/4” (32) | 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 (7.9) | Single |
| 8255-A14-1 | 1-1/4” (32) | 1,450 | 5/32 (4.0) | 1/4 (6.4) | 5/16 (7.9) | 3/8 (9.5) | Double | ||||
| 8255-A8-1 | 1-1/4” (32) | 850 | 11/64 (4.4) | 9/32 (7.1) | 21/64 (8.3) | 25/64 (9.9) | Double | ||||
| 8255-A5-1 | 1-1/4” (32) | 500 | 1/4 (6.4) | 5/16 (7.9) | 11/32 (8.7) | 13/32 (10.3) | Double | ||||
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