Airtac SCJ40 Standard Cylinder SCJ40X140-30
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X140-30 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 mm range without swapping the cylinder. Ø40mm bore, 140mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke140 mm
- Stroke adjust-30 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X140-30
The SCJ40X140-30 is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, letting you fine-tune the piston stop position by up to 30 mm without removing the cylinder from the machine. With a 40 mm bore and 16 mm piston rod, it delivers 628 N of push force at 0.5 MPa and up to 1130 N at 0.9 MPa, making it a solid mid-range actuator for tasks that need both force and positional flexibility.
This tie-rod cylinder uses a rear-cap adjusting screw to set the stroke end, so the effective stroke can be dialled back from the 140 mm nominal maximum during commissioning or format changes. It features a 21 mm air cushion, PT1/4 ports, and an M12x1.25 rod thread. The body length A(SCJ) is 185 mm, and the standard operating speed range is 30-800 mm/s.
Airtac SCJ40 Standard Cylinder SCJ40X140-30 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X140-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 140 mm |
| Stroke adjustment | Up to 30 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 SCJ40X140-30
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×140 | Nominal (maximum) stroke length in mm. |
| -30 | 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 SCJ40X140-30 Is Used
Commissioning & Fine-Tuning
Dial in the exact stroke end position on a new assembly line without swapping cylinders. The 30 mm rear screw adjustment lets technicians quickly compensate for stack-up tolerances during machine bring-up.
Product Changeover
Adjust the pusher stroke when packaging lines switch between box sizes. The SCJ40X140-30 eliminates the need for mechanical hard stops, reducing changeover time and part count.
Wear Compensation
Take up mechanical play in clamping or pressing fixtures over time. As tooling surfaces wear, the adjustable stroke end maintains consistent contact without reprogramming the controller.
Is the Airtac SCJ40 Standard Cylinder SCJ40X140-30 the Right Cylinder?
Choose the SCJ40X140-30 when you need to trim the stroke end on the fly—during setup, after tooling wear, or when switching between product sizes. If your application calls for more force, the 50 mm bore SCJ delivers 982 N push at 0.5 MPa; for a lighter, more compact solution, the 32 mm bore provides 402 N. This adjustable-stroke model is a direct replacement for another AirTAC SCJ40 cylinder with a 140 mm nominal stroke, 30 mm adjust range, PT ports, and basic mounting. For a fixed, non-adjustable stroke, the standard SC series is a simpler alternative. If the rod is exposed to off-axis loads, consider an external guide rail or a guided cylinder to prevent rod bending.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-30)
- ✓ 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 SCJ40X140-30 FAQ
At 0.5 MPa, the push force is 628 N and the pull force is 528 N (the difference is due to the 16 mm single piston rod). At the maximum operating pressure of 1.0 MPa, the push force reaches approximately 1256 N.
Yes, if your existing cylinder is an AirTAC SCJ40 with a 140 mm nominal stroke, a 30 mm adjust range, PT1/4 ports, and basic mounting. The adjustable-stroke feature is built into the rear cap, so the mounting footprint is identical to the fixed-stroke SC of the same bore.
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