Airtac SCJ40 Standard Cylinder SCJ40X120-75
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X120-75 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, 120mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke120 mm
- Stroke adjust-75 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X120-75
The SCJ40X120-75 is a 40 mm bore double-acting single-rod cylinder whose rear-cap adjusting screw lets you shorten the stroke end by up to 75 mm in the field. At 0.5 MPa it delivers 628 N push and 528 N pull, giving a useful force margin for clamping, pressing and light transfer tasks without stepping up to a 50 mm bore.
Because the stroke is adjustable you can dial in the exact end position during commissioning or format changeovers. The 16 mm rod, PT1/4 ports and 21 mm air cushion are shared with the fixed-stroke SC40 series, while the SCJ body length A is 185 mm — slightly longer to house the screw mechanism.
Airtac SCJ40 Standard Cylinder SCJ40X120-75 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X120-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 120 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 SCJ40X120-75
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×120 | 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 SCJ40X120-75 Is Used
Commissioning & Setup
Dial in the exact stroke end during machine build or line commissioning without machining spacers. The 75 mm range covers most trial-and-error adjustments.
Format Changeovers
Quickly reset the stroke for different product sizes on packaging or assembly conveyors. One cylinder adapts to multiple recipes.
Wear Compensation
Take up mechanical wear in grippers or clamps by advancing the stroke end a few millimetres, extending service intervals without replacing the actuator.
Is the Airtac SCJ40 Standard Cylinder SCJ40X120-75 the Right Cylinder?
Choose the SCJ40X120-75 when you need to fine-tune the stroke end on the machine rather than swapping cylinders or adding hard stops. If the 628 N push force at 0.5 MPa is marginal, the 50 mm bore SCJ50 series offers 982 N push at the same pressure. For applications that do not require field adjustment, the fixed-stroke SC40 cylinder is a simpler, lower-cost alternative.
A direct replacement must match the 40 mm bore, 120 mm nominal stroke, 75 mm adjust range, PT port thread and basic mounting. If you later need position sensing, order the -S magnet version and add a CMSG or DMSG sensor.
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 SCJ40X120-75 FAQ
At 0.5 MPa the push force is 628 N and the pull force is 528 N. At the maximum operating pressure of 0.9 MPa, push reaches 1130 N. Because it is a single-rod cylinder, push force is always greater than pull force.
Yes, if you need the 75 mm stroke-end adjustment. The SCJ40 shares the same bore, rod, port and mounting accessories as the SC40. Ensure the longer body length (185 mm) fits your space and that the adjusting screw is accessible after installation.
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