Ingersoll Rand 8255-A8-3 is a Par-A-Matic Series Self-Feed Air Drill for repeatable production drilling and fixture-mounted machining where controlled feed and extended spindle travel are required. Its 0.50 HP (.37 kW) pneumatic motor operates at an 850 RPM free speed through a double gear reduction, providing the low-speed spindle configuration of the A8 model. The -3 version provides a 3 in. (76 mm) stroke, giving production fixtures additional spindle travel for longer drilling cycles. Manufacturer data lists a 5/16 in. (7.9 mm) drilling capacity in steel, while the standard chuck capacity is 3/8 in. (9.5 mm).
The Par-A-Matic self-feed mechanism uses a double-acting air piston to provide controlled forward and retract strokes. Needle-valve controls adjust the forward and retract movement, 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 provide quieter pneumatic operation. The manufacturer specifies 170 lb (756 N) thrust at 90 PSI, 2.3 ft³/cycle (65 L/cycle) air consumption at working speed, and a sound level of 74 dB(A).
Type: Self-Feed Air Drill | Series: Par-A-Matic | Model: 8255-A8-3 | Chuck Capacity: 3/8 in. (9.5 mm) standard chuck | Steel Drilling Capacity: 5/16 in. (7.9 mm) | Motor Power: 0.50 HP (.37 kW) | Free Speed: 850 RPM | Gear Reduction: Double | Stroke Length: 3 in. (76 mm) | Nominal Drilling Capacity — Type 304 Stainless Steel: 11/64 in. (4.4 mm) | Nominal Drilling Capacity — SAE 1213 Steel: 9/32 in. (7.1 mm) | Nominal Drilling Capacity — 2024-T4 Aluminum: 21/64 in. (8.3 mm) | Nominal Drilling Capacity — Wood, Medium or FRP: 25/64 in. (9.9 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 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.
- Ball-bearing spindle support provides precision spindle guidance.
- The muffled exhaust helps provide quieter pneumatic operation.
- Double gear reduction provides the drive configuration specified for the 850 RPM model.
- The 3 in. stroke provides extended spindle travel for compatible production fixtures.
NON-RETURNABLE. MADE TO ORDER.
Applications:
- Production drilling — performing repeatable holemaking cycles where controlled pneumatic feed and retract movement are required.
- Fixture-mounted machining — integrating the drill into dedicated fixtures where a 3 in. stroke provides the required spindle travel.
- Metalworking — drilling 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-A8-3?
A: The 8255-A8-3 has an 850 RPM free speed and uses double gear reduction. - Q: What does the “-3” configuration indicate?
A: The -3 configuration provides a 3 in. (76 mm) stroke, giving the spindle additional travel compared with the shorter A8 configurations. - Q: What is the standard chuck capacity?
A: The standard chuck capacity is 3/8 in. (9.5 mm). This is separate from the manufacturer's stated 5/16 in. steel drilling capacity. - Q: What are the material-specific drilling capacities?
A: The manufacturer lists 11/64 in. (4.4 mm) in Type 304 stainless steel, 9/32 in. (7.1 mm) in SAE 1213 steel, 21/64 in. (8.3 mm) in 2024-T4 aluminum, and 25/64 in. (9.9 mm) in wood, medium or FRP. - Q: Can the 8255-A8-3 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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