The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X150-75 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 75 mm range without swapping the cylinder. Ø40mm bore, 150mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X150-75 brings field-adjustable stroke control to the 40 mm bore class, delivering 628 N of push force at a standard 0.5 MPa supply. A rear-cap adjusting screw lets you shorten the stroke end by up to 75 mm without removing the cylinder from the machine, making it a practical choice for commissioning trials and format changeovers where the exact stop position needs to be dialled in on-site.
This double-acting, single-rod cylinder uses a 16 mm diameter piston rod and PT1/4 ports, with a 21 mm air cushion at each end for smooth deceleration. The SCJ body length (A dimension) is 185 mm, slightly longer than a fixed-stroke SC to accommodate the adjusting mechanism. Operating pressure spans 0.15–1.0 MPa, and at the maximum 0.9 MPa the push thrust reaches 1130 N.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X150-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 150 mm |
| Stroke adjustment | Up to 75 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. |
| -75 | 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-stop position during machine build without swapping cylinders or machining spacer blocks. The 75 mm adjustment range gives technicians plenty of room to dial in the exact stroke.
Quickly adapt a pusher or diverter station for different box or pallet sizes by adjusting the stroke end. Operators can make the change in seconds with a wrench, minimising downtime between production runs.
In clamping or pressing fixtures, use the rear screw to take up mechanical wear on tooling or pads over time, maintaining consistent contact pressure without reprogramming the machine controller.
Step up to a 50 mm bore SCJ if your application needs more force—the SCJ50 delivers 982 N push at 0.5 MPa. For a simpler fixed-stroke solution where no in-field adjustment is required, the standard SC40 series is a direct alternative. When replacing an existing SCJ40X150-75, match the 40 mm bore, 150 mm nominal stroke, 75 mm adjust range, PT port thread, and basic mounting style; if the original carried a magnet suffix (-S), ensure the replacement includes it for sensor compatibility. At 150 mm stroke, rod bending is rarely a concern under axial loads, but for any off-axis force, add an external guide rail to protect the rod and bearing.
Adjustable-stroke checklist
At 0.5 MPa, push force is 628 N and pull force is 528 N (the difference is due to the single 16 mm rod reducing the piston area on the return side). At the maximum operating pressure of 0.9 MPa, push force rises to 1130 N.
Yes, provided the mounting and porting match. The SCJ body is slightly longer (185 mm A-dimension) to house the adjusting screw. Ensure you have clearance behind the rear cap for the screw and wrench access. The force output and port size (PT1/4) are identical to the SC40.
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