The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X250-40S 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. Ø50mm bore, 250mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X250-40S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke, delivering 982 N of push force at 0.5 MPa. A rear-cap adjusting screw provides up to 40 mm of stroke-end reduction, allowing fine-tuning for commissioning or format changes without swapping the cylinder. Its 20 mm piston rod and PT1/4 ports handle a maximum standard stroke of 1200 mm for this 50 mm bore.
This model includes a built-in magnet, enabling direct mounting of CMSG/DMSG/EMSG sensors for reliable end-of-stroke detection. The tie-rod construction and adjustable air cushion ensure dependable deceleration, making it a practical choice for applications where the stroke length must be dialed in precisely on the machine.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X250-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 250 mm |
| Stroke adjustment | Up to 40 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. |
| ×250 | 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.
The 40 mm adjustable stroke allows technicians to dial in the exact end position during machine setup, compensating for assembly tolerances without needing to machine custom stops.
Quickly adjust the cylinder's stroke end to accommodate different product sizes on a packaging or sorting line, reducing downtime between batches.
As tooling or gripper pads wear over time, the stroke can be slightly extended via the rear screw to maintain precise contact and consistent process quality.
Choose the SCJ50X250-40S when you need a mid-range force actuator with the flexibility to fine-tune the stroke end by up to 40 mm. If 982 N of push force is insufficient, stepping up to a 63 mm bore provides 1559 N at the same pressure. For a fixed, non-adjustable stroke, the standard SC series is a simpler alternative. This cylinder is a direct replacement for an AirTAC SCJ of the same 50 mm bore, 250 mm nominal stroke, 40 mm adjust range, PT port thread, and magnet option.
With a 250 mm stroke, consider the potential for side loading on the 20 mm rod. If the load is not guided externally, adding an external guide rail or switching to a guided cylinder will prevent rod bending and ensure long seal life.
Adjustable-stroke checklist
At 0.5 MPa, the cylinder provides 982 N of push force and 825 N of pull force. The push force is higher because it acts on the full 50 mm bore area, while the pull force is reduced by the 20 mm rod area.
Yes, the 'S' in the model code indicates a built-in magnet. This allows you to mount AirTAC CMSG, DMSG, or EMSG reed or solid-state sensors directly onto the cylinder barrel to detect piston position.
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