Airtac SCJ40 Standard Cylinder SCJ40X300-75
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X300-75 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 75 mm range without swapping the cylinder. Ø40mm bore, 300mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke300 mm
- Stroke adjust-75 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X300-75
The SCJ40X300-75 is a 40 mm bore double-acting single-rod cylinder with a 75 mm rear-cap stroke adjuster, letting you fine-tune the stroke end position from 225 mm up to the full 300 mm nominal stroke without swapping the cylinder. At 0.5 MPa it delivers 628 N push and 528 N pull, driven by a 16 mm rod through PT1/4 ports.
Body length A is 185 mm plus stroke, and the adjustable cushion decelerates the piston smoothly. This model suits commissioning trials and format changeovers where the exact end stop must be dialled in on the machine. It is a genuine AirTAC tie-rod cylinder, not an ISO 15552 interchangeable type.
Airtac SCJ40 Standard Cylinder SCJ40X300-75 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X300-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 300 mm |
| Stroke adjustment | Up to 75 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/4 |
| Rod thread | M12×1.25 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 21 mm |
| Max stroke | Up to 1200 mm |
Specifications follow the official AirTAC SCJ (adjustable-stroke) datasheet. The rear adjusting screw sets the stroke end position; force is the same as the equivalent single-rod SC bore. Confirm against the product label before installation. Thread options: PT (standard) / G.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
SCJ is single-rod, so force matches the equivalent SC bore: push uses the full bore area, pull subtracts the rod area. Actual usable force is lower than theoretical due to friction and back-pressure; size with a safety margin.
Model Code: Airtac SCJ40 Standard Cylinder SCJ40X300-75
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×300 | Nominal (maximum) stroke length in mm. |
| -75 | Adjustable-stroke range in mm (options 10/20/30/40/50/75/100). |
| -S | Optional built-in magnet for sensor position sensing. |
Related types: SC (single rod, fixed stroke), SCD (double rod), SCT (multi-position). SCJ mounting: Basic, FA, LB, TC, TCM1. Seals: TPU standard / H = Viton / N = NBR. Thread: blank = PT, G = G thread.
Where the Airtac SCJ40 Standard Cylinder SCJ40X300-75 Is Used
Commissioning Fine-Tuning
Dial in the exact end stop during machine setup with the 75 mm rear screw, eliminating the need to swap fixed-stroke cylinders or fabricate external hard stops.
Format Changeovers
Quickly adjust the stroke end for different product sizes on packaging or sorting lines, reducing changeover time between batches.
Wear Take-Up
Compensate for tooling or gripper wear over time by slightly extending the effective stroke via the rear adjuster, maintaining consistent contact without replacing parts.
Is the Airtac SCJ40 Standard Cylinder SCJ40X300-75 the Right Cylinder?
Choose this 40 mm bore when 628 N push at 0.5 MPa matches your load. If you need more force, step up to the 50 mm bore (982 N push at 0.5 MPa); for a lighter, more compact solution the 32 mm bore offers 402 N push. Because the stroke is 300 mm, check for side loads on the extended rod—an external guide or a guided cylinder may be needed for off-axis forces. For a fixed-stroke alternative without the rear screw, use the standard SC series. A direct replacement must match the 40 mm bore, 300 mm nominal stroke, 75 mm adjust range, PT ports, basic mounting, and no magnet.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-75)
- ✓ Required force at your working pressure
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Set the rear adjusting screw, then lock it before running.
- check Adjust end cushion screws for smooth stops.
- check Use SCJ mounting accessory (FA / LB / TC / TCM1).
- check Installation by qualified personnel per AirTAC docs.
Airtac SCJ40 Standard Cylinder SCJ40X300-75 FAQ
At 0.5 MPa, push force is 628 N and pull force is 528 N. The maximum push force at the 0.9 MPa operating limit is 1130 N. Because it is a single-rod cylinder, push force is always greater than pull force.
A rear-cap screw sets the stroke end position within a 75 mm range, so the effective stroke is adjustable from 225 mm to 300 mm. It directly replaces another SCJ40 with the same bore, nominal stroke, and adjust range. For a fixed-stroke application, use an SC40X300 cylinder instead.
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