The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X25-20TC 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. Ø50mm bore, 25mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X25-20TC is a 50 mm bore double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end. Its rear-cap adjusting screw provides up to 20 mm of stroke shortening, letting you fine-tune the end position without swapping the cylinder. With a 20 mm diameter piston rod and PT1/4 ports, this model delivers 982 N of push force at 0.5 MPa.
This TC variant includes a centre trunnion pivot, supplied with the TCM1 bracket (mounting code F-SC50TC), making it ideal for applications where the cylinder body needs to swing through an arc. The body length A(SCJ) is 194 mm, and the cylinder uses a standard TPU seal for reliable operation from -20 to +70 °C. The adjustable air cushion decelerates the piston smoothly at both ends of its 25 mm nominal stroke.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X25-20TC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 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 | M16×1.5 |
| 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 | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 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. |
|---|---|
| 50 | 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.
Perfect for commissioning and fine-tuning the end position on compact pick-and-place mechanisms. The 20 mm adjustment screw allows operators to dial in the exact stop point for a 25 mm stroke without mechanical rework.
The centre trunnion mount allows the cylinder to pivot, making it suitable for opening and closing small diverter gates on conveyors. The adjustable stroke helps compensate for seal wear or minor misalignment over time.
Use this cylinder for a clamping station where the final clamp position needs adjustment for different workpiece thicknesses. The 982 N push force at 0.5 MPa provides a firm hold for light machining or assembly tasks.
Choose this SCJ50X25-20TC when you need a 50 mm bore cylinder with a short, precisely tunable stroke and a pivoting mount. If 982 N of push force at 0.5 MPa is insufficient, stepping up to a 63 mm bore provides 1559 N. For applications requiring a fixed, non-adjustable stroke, the standard SC series is a more economical choice. This cylinder is a direct replacement for another AirTAC SCJ adjustable-stroke cylinder of the same 50 mm bore, 25 mm nominal stroke, 20 mm adjust range, PT port thread, and TC centre trunnion mounting.
Adjustable-stroke checklist
The theoretical push force is 982 N at 0.5 MPa and 1767 N at 0.9 MPa. The pull force on the return stroke is lower due to the 20 mm piston rod area, providing 825 N at 0.5 MPa.
A rear-cap adjusting screw lets you shorten the stroke end by up to 20 mm. This allows for on-machine fine-tuning without changing the cylinder, unlike a fixed-stroke SC cylinder. It does not change the cylinder's force or speed.
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