The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X150-40 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, 150mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X150-40 is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, letting you fine-tune the piston stop position within a 40 mm range without replacing the unit. With a 40 mm bore and 16 mm rod, it delivers 628 N of push force and 528 N of pull force at 0.5 MPa, making it a solid mid-range actuator for tasks that need on-machine stroke tweaking.
The rear-cap adjusting screw shortens the stroke end from the nominal 150 mm maximum, which is well within the 1200 mm standard stroke limit for this bore. The cylinder body length A is 185 mm, and it uses PT1/4 ports with an M12x1.25 rod thread. An adjustable air cushion at both ends decelerates the piston smoothly, and the standard TPU seals handle operating temperatures from -20 to +70 °C.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X150-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 150 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. |
| ×150 | 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.
During machine commissioning, the 40 mm adjust range lets technicians dial in the exact stroke end position to match tooling or fixtures, eliminating the need to swap cylinders for minor dimensional variations.
On packaging or assembly lines, the adjustable stroke allows operators to quickly reconfigure a pusher or stopper cylinder for a new product size without mechanical modifications, reducing downtime between batches.
In clamping or pressing operations, the stroke-end screw can be advanced periodically to compensate for pad or tooling wear, maintaining consistent contact force and cycle timing over the life of the consumable.
Step up to the 50 mm bore SCJ if your application requires more force; the SCJ50 provides 982 N of push at 0.5 MPa. For applications where the stroke never needs adjustment, the fixed-stroke SC40 series offers a simpler, more compact alternative. This SCJ40X150-40 is a direct replacement for any AirTAC SCJ adjustable cylinder of the same 40 mm bore, 150 mm nominal stroke, 40 mm adjust range, and PT port thread.
At a 150 mm stroke, rod bending from side loads is generally not a primary concern for a 16 mm rod in typical pneumatic applications, but always ensure the load is guided and aligned axially with the rod to prevent premature seal and bearing wear. If significant side forces are unavoidable, consider adding an external guide rail or switching to a guided cylinder.
Adjustable-stroke checklist
At the standard operating pressure of 0.5 MPa, this 40 mm bore cylinder generates 628 N of push force on the piston and 528 N of pull force on the retract stroke due to the 16 mm rod reducing the effective piston area. The maximum push force at 0.9 MPa is 1130 N.
A rear-cap adjusting screw physically limits the piston's forward travel, letting you shorten the stroke end by up to 40 mm from the nominal 150 mm. Choose the SCJ when you need to fine-tune the stroke position on the machine for setup, changeover, or wear take-up. If the stroke is fixed and will never change, the standard SC series is a more cost-effective choice.
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