Airtac SCJ40 Standard Cylinder SCJ40X40-40TC
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X40-40TC is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 mm range without swapping the cylinder. Ø40mm bore, 40mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke40 mm
- Stroke adjust-40 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X40-40TC
The SCJ40X40-40TC is a double-acting, single-rod pneumatic cylinder that delivers 628 N of push force at 0.5 MPa, making it a capable actuator for medium-duty industrial tasks. Its defining feature is a rear-cap adjusting screw that provides up to 40 mm of stroke-end reduction, allowing field technicians to fine-tune the piston's stopping position without swapping the cylinder or adding external hard stops.
This model is configured with a TC centre trunnion mount (supplied with the TCM1 bracket, order code F-SC40TC), which allows the cylinder body to pivot, ideal for applications where the load follows an arc. The 16 mm diameter piston rod and PT1/4 port ensure a robust connection, while the 21 mm air cushion at each end decelerates the piston smoothly, protecting the end caps during high-cycle operation.
Airtac SCJ40 Standard Cylinder SCJ40X40-40TC Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X40-40TC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 40 mm |
| Stroke adjustment | Up to 40 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 SCJ40X40-40TC
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×40 | Nominal (maximum) stroke length in mm. |
| -40 | 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 SCJ40X40-40TC Is Used
Commissioning & Setup
The 40 mm adjustable stroke allows integrators to precisely match the cylinder's end-of-travel to a machine's physical tooling during initial build and debug, eliminating the need to machine custom spacers.
Product Changeover
On packaging lines, operators can quickly adjust the stroke end to accommodate a new product size or format without disassembling the actuator, significantly reducing downtime between batches.
Wear Compensation
In clamping or pressing fixtures, the adjusting screw can be advanced over time to take up mechanical wear in the tooling or workpiece, maintaining consistent clamping force and position without replacing parts.
Is the Airtac SCJ40 Standard Cylinder SCJ40X40-40TC the Right Cylinder?
Choose the SCJ40X40-40TC when you need a 40 mm bore cylinder with a pivoting mount and the ability to dial in the stroke end position on the machine. If your force requirements increase, stepping up to the SCJ50 series provides 982 N of push force at the same 0.5 MPa pressure. For applications where the stroke length is fixed and will never need adjustment, the standard SC40X40 fixed-stroke cylinder is a simpler, more cost-effective alternative. A direct replacement must match the 40 mm bore, 40 mm nominal stroke, 40 mm adjustable range, PT port thread, and the TC centre trunnion mounting configuration.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-40)
- ✓ 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 SCJ40X40-40TC FAQ
At the standard operating pressure of 0.5 MPa, this cylinder generates 628 N of push force and 528 N of pull force. The push force is higher because the single piston rod reduces the effective area on the return stroke. At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 128 kgf.
No. Like all standard pneumatic cylinders, the SCJ40X40-40TC will not hold its position if air pressure is lost or the control valve is centered. The air cushion only decelerates the piston at the end of stroke, and the adjusting screw only sets the stroke end point. To hold a load safely without live air pressure, you must add an external rod lock or a pilot-operated check valve.
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