Ingersoll Rand 8255-A21-3 is a Par-A-Matic Series Self-Feed Air Drill configured for repeatable production drilling, fixture-mounted machining, and automated secondary machining. Its 0.50 HP (.37 kW) pneumatic motor provides a 2,100 RPM free speed through a single gear reduction. The -3 configuration provides a 3 in. (76 mm) stroke, giving production fixtures extended spindle travel when the drilling cycle requires more feed movement. The drill uses a 5/16 in. (7.9 mm) standard chuck and provides material-specific drilling capacities for Type 304 stainless steel, SAE 1213 steel, 2024-T4 aluminum, and wood, medium or FRP.
The Par-A-Matic self-feed mechanism uses a double-acting air piston to control forward and retract movement. Needle-valve controls allow adjustment of the forward and retract strokes, while the adjustment screw provides infinite stroke-length settings. A built-in four-way valve permits both manual and remote operation for integration into suitable production equipment. Ball-bearing spindle support provides precision spindle guidance, and the muffled exhaust helps reduce operating noise. The specification for this model family includes 170 lb (756 N) thrust at 90 PSI, 2.3 ft³/cycle (65 L/cycle) air consumption at working speed, and a 74 dB(A) sound level.
Type: Self-Feed Air Drill | Series: Par-A-Matic | Model: 8255-A21-3 | Chuck Capacity: 5/16 in. (7.9 mm) | Motor Power: 0.50 HP (.37 kW) | Free Speed: 2,100 RPM | Gear Reduction: Single | Stroke Length: 3 in. (76 mm) | Nominal Drilling Capacity — Type 304 Stainless Steel: 7/64 in. (2.8 mm) | Nominal Drilling Capacity — SAE 1213 Steel: 7/32 in. (5.6 mm) | Nominal Drilling Capacity — 2024-T4 Aluminum: 9/32 in. (7.1 mm) | Nominal Drilling Capacity — Wood, Medium or FRP: 5/16 in. (7.9 mm) | Thrust: 170 lb (756 N) at 90 PSI
Features:
- The built-in four-way valve permits both manual and remote operation.
- 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.
- Ball-bearing spindle support provides precision spindle guidance.
- The muffled exhaust helps provide quieter pneumatic operation.
- Single gear reduction provides the specified drive configuration for the 2,100 RPM model.
- The 3 in. stroke provides extended spindle travel for compatible production fixtures.
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 fixtures where the 3 in. stroke provides the required spindle travel.
- Metalworking — drilling Type 304 stainless steel and SAE 1213 steel within the manufacturer's nominal material capacities.
- Aluminum machining — drilling 2024-T4 aluminum within the specified nominal capacity.
- Automated secondary machining — incorporating the self-feed drill into suitable pneumatic production equipment using manual or remote control.
FAQs:
- Q: What is the free speed of the 8255-A21-3?
A: The 8255-A21-3 has a 2,100 RPM free speed and uses single gear reduction. - Q: What does the “-3” configuration indicate?
A: The -3 configuration provides a 3 in. (76 mm) stroke. This gives the spindle additional travel compared with the 1-1/4 in. and 2 in. configurations in the same model family. - Q: What are the material-specific drilling capacities?
A: The nominal capacities are 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: Is the 5/16 in. specification the maximum drilling size for every material?
A: No. The 5/16 in. specification identifies the standard chuck capacity and the nominal capacity for wood, medium or FRP. Actual drilling capacity varies by workpiece material. - Q: Can the 8255-A21-3 be operated remotely?
A: Yes. The built-in four-way valve permits both manual and remote operation for suitable pneumatic control arrangements.
| 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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