The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X65-50S 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, 65mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X65-50S provides 628 N of push force at 0.5 MPa, making it a capable mid-range actuator for tasks requiring on-the-fly stroke adjustment. Its rear adjusting screw offers a full 50 mm of stroke-end reduction, allowing operators to fine-tune the piston's stopping position without disassembling the cylinder or adding external hard stops.
This model features a built-in magnet, enabling direct mounting of CMSG, DMSG, or EMSG sensors along the tie-rod barrel for reliable end-of-stroke or mid-stroke position feedback. With a 16 mm diameter piston rod and PT1/4 ports, it shares the same robust construction as the fixed-stroke SC series but adds critical flexibility for commissioning and format changes.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X65-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 65 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. |
| ×65 | 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.
Ideal for machine builders who need to dial in the exact stroke during initial start-up. The 50 mm adjustment range provides ample room to compensate for tolerance stack-ups in new assemblies.
Used on packaging lines where the push distance must change for different box sizes. Operators can quickly adjust the stroke end with the rear screw, minimizing downtime between batches.
In clamping or pressing fixtures, the adjustable stroke can be extended over time to compensate for wear on tooling or contact surfaces, maintaining consistent clamp force without replacing the cylinder.
With 628 N of push force at 0.5 MPa, the SCJ40 is a step up from the 32 mm bore (402 N) for applications needing more power without a large jump in size. If your load is consistently at the upper limit, consider moving to the 50 mm bore, which delivers 982 N. This adjustable-stroke model is the right choice when the exact stroke length is unknown at design time or needs periodic recalibration. For applications where the stroke is permanently fixed, the standard SC40 cylinder is a more economical alternative. A direct replacement must match the 40 mm bore, 65 mm nominal stroke, 50 mm adjust range, PT ports, and the magnetic piston option.
Adjustable-stroke checklist
A screw in the rear cap acts as an internal stop for the piston. Turning this screw changes the retracted end position, allowing you to shorten the effective stroke by up to 50 mm from the 65 mm nominal maximum. It adjusts the stroke end, not the force or speed.
At the standard 0.5 MPa operating pressure, the push force is 628 N and the pull force is 528 N. The maximum push force at 0.9 MPa is 1130 N. Because it is a single-rod cylinder, the push force is greater than the pull force due to the rod area on the return side.
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