Ingersoll Rand 8255-A50-1 is a Par-A-Matic Series Self-Feed Air Drill intended for repetitive drilling and fixture-mounted machining where controlled spindle feed and retract movement are needed. This model combines a 0.50 HP (.37 kW) pneumatic motor with a 5,000 RPM free speed and single gear reduction. The -1 configuration provides a 1-1/4 in. (32 mm) stroke, giving production equipment a controlled amount of spindle travel for repeatable drilling cycles. The supplied product title lists a 5/16 in. capacity.
The Par-A-Matic self-feed arrangement uses a double-acting air piston for controlled forward and retract strokes. Needle-valve controls adjust the forward and retract movement, while an adjustment screw provides infinite stroke-length settings. A built-in four-way valve permits manual or remote operation, allowing the drill to be incorporated into suitable pneumatic production equipment. Ball-bearing spindle support provides precision spindle guidance, and the muffled exhaust helps reduce operating noise. The supplied source information does not establish additional model-specific material capacities or pneumatic connection details clearly enough to add them without verification.
Type: Self-Feed Air Drill | Series: Par-A-Matic | Model: 8255-A50-1 | Capacity: 5/16 in. | Motor Power: 0.50 HP (.37 kW) | Free Speed: 5,000 RPM | Gear Reduction: Single | Stroke Length: 1-1/4 in. (32 mm)
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 5,000 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 quieter pneumatic operation.
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 self-feed drill into dedicated fixtures where the 1-1/4 in. stroke matches the required spindle travel.
- Secondary machining — adding repeatable drilling cycles to production equipment without continuous manual feed control.
- Metalworking — performing compatible drilling operations within the manufacturer's specified tooling and material limits.
- Automated manufacturing equipment — using the four-way valve for manual or remote operation where the pneumatic control system supports the application.
FAQs:
- Q: What is the free speed of the 8255-A50-1?
A: The 8255-A50-1 has a 5,000 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-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 motor power?
A: The correct motor rating is 0.50 HP (.37 kW). The supplied title states “.05 HP,” which appears to be a typographical error and should not be published as the motor rating. - Q: What is the listed drilling capacity?
A: The supplied product title identifies the 8255-A50-1 with a 5/16 in. capacity. The exact material-specific capacity should be confirmed against the manufacturer catalog before publishing additional material claims. - Q: Can the self-feed drill be operated remotely?
A: Yes. The built-in four-way valve permits manual or remote operation. - Q: What is the stroke length?
A: The -1 configuration provides a 1-1/4 in. (32 mm) stroke.
| 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 |
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|---|---|---|---|---|---|---|---|---|---|---|---|
| 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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