The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X300-40S 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. Ø40mm bore, 300mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The AirTAC SCJ40X300-40S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, providing a 40 mm adjustment range via a rear-cap screw. With a 40 mm bore, it delivers 628 N of push force at 0.5 MPa, making it a strong candidate for medium-duty positioning tasks where the final stroke length must be dialed in precisely during machine commissioning or format changeovers. The integrated magnet allows direct mounting of CMSG/DMSG/EMSG sensors for reliable end-of-stroke detection.
This tie-rod cylinder features a 16 mm diameter piston rod, PT1/4 ports, and an adjustable air cushion for smooth deceleration. The body length A(SCJ) is 185 mm, providing a compact footprint for its 300 mm nominal stroke. The 40 mm adjustable range lets operators fine-tune the stroke end without replacing the cylinder or adding external hard stops, reducing downtime during setup.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X300-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 300 mm |
| Stroke adjustment | Up to 40 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. |
| ×300 | 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.
Fine-tune the end position of a material stop or pusher during initial machine setup. The 40 mm screw adjustment eliminates the need to shim or reposition the entire cylinder, saving significant commissioning time.
Quickly adapt a diverter gate stroke for different box sizes on a packaging line. The operator adjusts the rear screw to match the new product width without disassembling the actuator or changing tooling.
Compensate for mechanical wear in a clamping or pressing fixture. As tooling pads wear down over time, the adjustable stroke end can be extended slightly to maintain consistent clamping force and part contact.
Select the SCJ40X300-40S when your application requires a 300 mm nominal stroke that can be shortened by up to 40 mm on the machine. If you need more force, stepping up to the 50 mm bore (SCJ50) provides 982 N of push force at the same 0.5 MPa pressure. For a fixed, non-adjustable stroke, the standard SC series offers a simpler, slightly shorter body. This model is a direct replacement for any AirTAC SCJ40X300-40S cylinder with a PT port and built-in magnet. For strokes of 300 mm or more, consider an external guide rail or a guided cylinder to protect the 16 mm rod from side loads and prevent bending under high cycle rates.
Adjustable-stroke checklist
A screw mechanism in the rear cap limits how far the piston can retract, effectively shortening the stroke end. The 40 mm adjustment range means the effective stroke can be set anywhere between 260 mm and the full 300 mm. It adjusts the end position only and does not change the cylinder's output force or speed.
At the standard 0.5 MPa operating pressure, the push force is 628 N and the pull force is 528 N. At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 1256 N. Because it is a single-rod cylinder, the push force is always greater than the pull force due to the rod area on the return side.
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