The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X900-100 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 100 mm range without swapping the cylinder. Ø40mm bore, 900mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X900-100 is a double-acting, single-rod pneumatic cylinder from the AirTAC SCJ adjustable-stroke family, built around a 40 mm bore and a 16 mm diameter piston rod. Its defining feature is the rear-cap adjusting screw, which provides a full 100 mm of stroke-end shortening, allowing machine builders to fine-tune the 900 mm nominal stroke in the field without swapping the cylinder. At a standard 0.5 MPa supply, it delivers 628 N of push force and 528 N on the pull stroke.
This model uses a PT1/4 pneumatic port and an M12x1.25 rod thread, with an adjustable air cushion length of 21 mm to decelerate the piston smoothly. The body length A(SCJ) is 185 mm, and the cylinder is rated for a maximum operating pressure of 1.0 MPa, where push force reaches 1130 N. It is a genuine AirTAC tie-rod cylinder, not an ISO 15552 profile, so dimensional interchangeability is limited to other SCJ models of the same configuration.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X900-100 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 900 mm |
| Stroke adjustment | Up to 100 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. |
| ×900 | Nominal (maximum) stroke length in mm. |
| -100 | 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.
A 900 mm stroke pusher with 100 mm of adjustment allows operators to fine-tune the final push position for different pallet sizes or box overhangs without reprogramming the controller.
Moving parts between distant conveyors often requires a long cylinder. The adjustable stroke compensates for slight misalignments in the mounting frame or conveyor positions over time.
In wood processing, a long-stroke cylinder sets the saw fence. The 100 mm adjuster provides rapid, manual fine-tuning for different cut widths without needing to change the physical cylinder or end-stops.
Choose the SCJ40X900-100 when you need a long, 900 mm stroke that can be precisely dialled back by up to 100 mm during commissioning or product changeovers. If your force requirement is lower, stepping down to a 32 mm bore reduces push force to 402 N at 0.5 MPa; if you need more power, the 50 mm bore provides 982 N. Because this is a 900 mm stroke, be mindful of side loading and rod buckling—consider an external linear guide or switch to a guided cylinder if the load is not perfectly axial. For a fixed-stroke application without the need for field adjustment, the standard SC series is a simpler, more cost-effective alternative. A direct replacement must match the 40 mm bore, 900 mm nominal stroke, 100 mm adjust range, PT1/4 ports, basic mounting, and the absence of a magnet.
Adjustable-stroke checklist
At the standard operating pressure of 0.5 MPa, the push force is 628 N and the pull force is 528 N. The difference is due to the 16 mm piston rod reducing the effective area on the return stroke. At the maximum operating pressure of 1.0 MPa, the theoretical push force is 1280 N, but the rated maximum is 1130 N at 0.9 MPa.
Yes, the SCJ40X900-100 has the same bore, rod size, and port size as a fixed-stroke SC40. However, the SCJ body is longer to house the adjusting mechanism. It is a direct functional upgrade if you need field-adjustable stroke, but ensure the extra body length fits your machine's envelope.
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