The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X100-50TC 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, 100mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X100-50TC is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke, built on a rugged tie-rod design. Its rear-cap adjusting screw provides up to 50 mm of stroke-end reduction, allowing you to fine-tune the piston's stopping position without removing the cylinder or adding external hard stops. The 40 mm bore delivers 628 N of push force at 0.5 MPa, making it a capable actuator for medium-force positioning tasks.
This model is configured with a centre trunnion (TC) mount, which allows the cylinder body to pivot, ideal for applications where the load follows an arc. The trunnion bracket (TCM1) is included, and the mounting kit is ordered as F-SC40TC. With a 16 mm diameter piston rod, PT1/4 ports, and a 21 mm air cushion, it provides reliable deceleration. The standard TPU seal offers a working temperature range of -20 to +70 °C.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X100-50TC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 100 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. |
| ×100 | 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 adjustable stroke lets technicians dial in the exact end position for a pusher or stop without fabricating custom shims or brackets, saving hours of setup time.
On a packaging line, the stroke can be quickly adjusted to accommodate different box sizes. The centre trunnion mount allows the cylinder to swing as it diverts products of varying widths onto different lanes.
In a clamping or pressing fixture, the adjusting screw can be advanced periodically to compensate for wear on tooling or contact surfaces, maintaining consistent clamp force without replacing the cylinder.
Select the SCJ40X100-50TC when you need a mid-range force actuator that can be precisely tuned on the machine. If 628 N of push force at 0.5 MPa is insufficient, stepping up to a 50 mm bore (SCJ50) provides 982 N. If your application requires a fixed, non-adjustable stroke, the standard SC series is a more economical choice. The centre trunnion mount is correct for pivoting loads; for a rigid, surface-mounted installation, consider the LB foot mount or FA front flange variant.
For a direct replacement, match the 40 mm bore, 100 mm nominal stroke, 50 mm adjustable range, PT port thread, and TC centre trunnion mount. This model does not include a magnet, so if you require position sensing, specify the -S suffix. For strokes of 300 mm or more, evaluate the rod's side-load capacity and consider an external guide or a guided cylinder to prevent rod bending.
Adjustable-stroke checklist
The theoretical push force at 0.5 MPa is 628 N, and the pull force is 528 N. At the maximum operating pressure of 1.0 MPa, the push force reaches 1130 N. The force is identical to a standard SC fixed-stroke cylinder of the same bore.
A rear-cap screw mechanically limits the piston's stroke end by up to 50 mm. You can replace a fixed-stroke SC cylinder with an SCJ of the same bore and nominal stroke, but you must ensure the longer body length A(SCJ) of 185 mm fits your machine and that the rear adjusting screw is accessible.
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