The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X25-20TC is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 mm range without swapping the cylinder. Ø40mm bore, 25mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X25-20TC is a double-acting, single-rod pneumatic cylinder that integrates a rear-cap adjusting screw, giving you up to 20 mm of field-adjustable stroke-end control without swapping the unit. With a 40 mm bore and 16 mm rod, it delivers 628 N of push force at 0.5 MPa, making it a compact yet capable actuator for fine-tuning end positions.
This model comes equipped with a TC centre trunnion mount (supplied with the TCM1 bracket, order code F-SC40TC), allowing the cylinder to pivot and follow an arc during operation. The body length A(SCJ) is 185 mm, and it uses PT1/4 ports with an M12x1.25 rod thread, suitable for standard pneumatic connections.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X25-20TC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 25 mm |
| Stroke adjustment | Up to 20 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.
| 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.
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×25 | Nominal (maximum) stroke length in mm. |
| -20 | 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.
Quickly adjust the stroke end to accommodate different product sizes on a packaging line without mechanical stops.
Fine-tune the actuator's end position to account for pad or gripper wear, maintaining consistent contact force.
The TC trunnion mount lets the cylinder swing while the adjustable screw sets the exact gate open or closed position.
Choose the SCJ40X25-20TC when you need to dial in a precise stroke end point on a pivoting assembly. If your force requirements increase, stepping up to the 50 mm bore provides 982 N of push at the same pressure. For applications where the stroke must remain absolutely fixed and repeatable without any field adjustment, the standard SC fixed-stroke cylinder is a more economical choice. To replace this unit, match the 40 mm bore, 25 mm nominal stroke, 20 mm adjust range, PT port thread, and TC centre trunnion mounting.
Adjustable-stroke checklist
A screw in the rear cap lets you shorten the stroke end by up to 20 mm from its nominal 25 mm maximum. It sets a new mechanical stop for the piston, so you can fine-tune the position without changing the cylinder or adding external hard stops.
At the standard operating pressure of 0.5 MPa, it generates 628 N of push force and 528 N of pull force. The pull force is lower due to the area occupied by the 16 mm single rod.
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