The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X300-50STC 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, 300mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X300-50 is a double-acting, single-rod pneumatic cylinder that puts stroke-end fine-tuning directly on the machine. Its rear-cap adjusting screw provides a 50 mm field-adjustable range, letting you dial in the exact stopping position for a 300 mm nominal stroke without swapping the cylinder or adding external hard stops. The 40 mm bore delivers 628 N of push force at 0.5 MPa, driven by a 16 mm diameter piston rod through PT1/4 ports.
This model includes a built-in magnet (-S) for direct mounting of CMSG/DMSG/EMSG sensors, and ships with a centre trunnion (TC) pivot mount and TCM1 bracket for smooth swinging loads. The body length A(SCJ) is 185 mm, and the adjustable air cushion provides 21 mm of deceleration at each end. It is a genuine AirTAC component, ready for commissioning trials and format changeovers where stroke precision matters.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X300-50STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 300 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. |
| ×300 | 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.
During machine commissioning, the 50 mm rear adjuster allows engineers to quickly fine-tune the end-of-stroke position for a 300 mm movement, eliminating the need to machine custom stops or swap cylinders to achieve the perfect fit.
On a packaging line, operators can adjust the stroke end to accommodate different box sizes. The SCJ40X300-50's trunnion mount lets the cylinder pivot freely, while the sensor confirms the new position, drastically reducing changeover time.
In a clamping or pressing fixture, the adjustable stroke can be periodically tweaked to compensate for wear on tooling or contact surfaces, maintaining consistent clamp force and part quality without replacing the entire actuator.
Choose the SCJ40 when your application needs a 628 N push force class and the ability to tweak the stroke end by up to 50 mm. If you need more force, step up to the 50 mm bore SCJ50, which provides 982 N of push at the same 0.5 MPa pressure. For a fixed, non-adjustable stroke, the standard SC series is a simpler, more compact alternative. This SCJ40X300-50 replaces any AirTAC SCJ adjustable-stroke cylinder of the same 40 mm bore, 300 mm nominal stroke, 50 mm adjust range, PT port thread, TC centre trunnion mount, and built-in magnet. For this 300 mm stroke length, be mindful of side-loading on the 16 mm rod; if the load is not perfectly guided, pair the cylinder with an external guide rail or consider a guided cylinder to prevent rod bending and premature seal wear.
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 push force is higher because the single rod reduces the effective piston area on the return stroke. At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 1280 N.
Yes, if you need field adjustability. The SCJ40X300-50 has the same 40 mm bore, 300 mm nominal stroke, and mounting footprint as a fixed SC, but adds a rear adjusting screw for a 50 mm stroke-end range. Ensure your replacement matches the port thread (PT), trunnion mount (TC), and magnet option (-S) for a direct drop-in fit.
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