The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X250-50STC is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø40mm bore, 250mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X250-50STC is a double-acting, single-rod pneumatic cylinder with a 40 mm bore and a 250 mm nominal stroke, featuring a rear-cap adjusting screw that provides a 50 mm field-adjustable stroke range. This allows fine-tuning of the stroke end position without replacing the cylinder, delivering 628 N of push force at 0.5 MPa and up to 1130 N at 0.9 MPa.
This model is configured with a built-in magnet (-S) for direct mounting of CMSG/DMSG/EMSG sensors and a centre trunnion pivot (TC) for applications requiring the cylinder to swing. The 16 mm diameter rod and PT1/4 ports ensure robust performance, with an adjustable air cushion providing smooth deceleration over its 21 mm cushion length.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X250-50STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 250 mm |
| Stroke adjustment | Up to 50 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. |
| ×250 | Nominal (maximum) stroke length in mm. |
| -50 | 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 50 mm adjustable stroke allows technicians to dial in the exact end-stop position during initial machine setup, eliminating the need to shim or reposition the cylinder for a perfect fit.
Quickly adapt a packaging machine's pusher stroke for different box sizes. The rear screw adjustment makes format changes fast and tool-free, minimizing downtime between production runs.
In high-cycle clamping or pressing fixtures, the stroke can be incrementally lengthened to compensate for wear on tooling or contact surfaces, maintaining consistent clamping force without replacing parts.
Select the SCJ40X250-50STC when you need a 40 mm bore cylinder with a nominal 250 mm stroke that can be precisely shortened by up to 50 mm during commissioning or changeovers. For higher force requirements, step up to the SCJ50 series, which offers 982 N of push force at 0.5 MPa. If your application does not require stroke adjustability, a fixed-stroke SC40X250 cylinder is a simpler, more economical alternative.
This cylinder is a direct replacement for another AirTAC SCJ40X250-50STC with a centre trunnion, magnet, and PT ports. The TC mount, using the F-SC40TC trunnion kit, is ideal for pivoting loads. For strokes of 250 mm, ensure the rod is not subjected to significant side loads; if misalignment is a concern, consider an external guide rail.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, this cylinder provides 628 N of push force and 528 N of pull force. The maximum push force at 0.9 MPa is 1130 N. The adjustable stroke feature does not alter the cylinder's force output.
It is a direct dimensional match for another AirTAC SCJ40X250-50STC with a centre trunnion (TC) mount, magnet, and PT threads. The adjustable stroke, bore, and mounting style must all match for proper interchangeability. It is not a direct replacement for fixed-stroke SC cylinders or other brands without verifying mounting dimensions.
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