The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X50-30S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 mm range without swapping the cylinder. Ø40mm bore, 50mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X50-30S is a double-acting, single-rod pneumatic cylinder with a rear-cap adjusting screw that provides up to 30 mm of field-adjustable stroke-end reduction. With a 40 mm bore and a 16 mm piston rod, it delivers 628 N of push force at 0.5 MPa, making it a capable mid-range actuator for tasks that need fine position tuning without swapping the cylinder.
This model includes a built-in magnet (suffix -S), allowing CMSG, DMSG, or EMSG reed and solid-state sensors to be clamped directly onto the tie-rod barrel for non-contact end-of-stroke sensing. The body length is 185 mm (A dimension), and the standard PT1/4 ports and M12x1.25 rod thread ensure straightforward pneumatic and mechanical integration.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X50-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 50 mm |
| Stroke adjustment | Up to 30 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. |
| ×50 | Nominal (maximum) stroke length in mm. |
| -30 | 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 30 mm adjustment range lets technicians dial in the exact end-stop position on a new assembly line without needing to swap out the cylinder or machine custom spacers, drastically reducing setup time.
On a packaging line, the stroke can be quickly re-adjusted to accommodate different box sizes or product heights, enabling a fast changeover between production runs with minimal downtime.
In a clamping or pressing fixture, the adjusting screw can be used to take up mechanical wear on tooling or contact surfaces over time, maintaining consistent clamping force and position without replacing parts.
Choose the SCJ40X50-30S when your application requires a 50 mm nominal stroke that can be precisely shortened by up to 30 mm during commissioning or changeovers. If you need more force, stepping up to the 50 mm bore SCJ50 series provides 982 N of push at the same 0.5 MPa pressure. For a fixed, non-adjustable stroke, the standard SC40 cylinder is a simpler, more cost-effective alternative.
This cylinder is a direct replacement for another AirTAC SCJ40 adjustable-stroke unit with the same 50 mm nominal stroke, 30 mm adjust range, PT1/4 ports, basic mounting, and a built-in magnet. Always verify the mounting style and sensor compatibility when replacing a competitor's cylinder.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, this 40 mm bore cylinder generates 628 N of push force and 528 N of pull force. The maximum push force at 0.9 MPa is 1130 N. The pull force is lower due to the area of the 16 mm piston rod.
You can, but only if you need the adjustable stroke feature. The SCJ40X50-30S has a slightly longer body (185 mm A-dimension) than a fixed-stroke SC40 to accommodate the adjusting screw mechanism. Ensure the extra length and the -30 adjustment range fit your machine's envelope.
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