The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X50-30TC is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 mm range without swapping the cylinder. Ø40mm bore, 50mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X50-30TC is a 40 mm bore double-acting single-rod cylinder that lets you fine-tune the stroke end by up to 30 mm using the rear adjusting screw, without removing the unit from the machine. At 0.5 MPa it delivers 628 N push and 528 N pull, drawing air through PT1/4 ports and guided by a 16 mm rod with M12x1.25 threads.
This model ships with the TC centre trunnion mount and its TCM1 bracket (order code F-SC40TC), making it ideal for pivoting applications. The adjustable air cushion decelerates the piston over the last 21 mm of travel, and the standard TPU seals cover a -20 to +70 °C operating range.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X50-30TC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 50 mm |
| Stroke adjustment | Up to 30 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. |
| ×50 | Nominal (maximum) stroke length in mm. |
| -30 | 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.
Quickly adjust the end position on packaging or labelling machines when switching between product sizes, eliminating the need for mechanical stop blocks.
Fine-tune the actuator stroke during initial machine build-out to compensate for assembly tolerances, ensuring perfect alignment with mating parts.
Periodically tweak the stroke end to take up mechanical wear in tooling or grippers, maintaining consistent process quality over time.
Choose the SCJ40 when you need 628 N push at 0.5 MPa and the ability to dial in the stroke end during commissioning or changeover. If your load requires more force, step up to the 50 mm bore SCJ50 which provides 982 N push at the same pressure. For a fixed-stroke application without adjustment, the standard SC series is a simpler alternative.
A direct replacement must match the 40 mm bore, 50 mm nominal stroke, -30 adjust range, PT thread, and TC centre trunnion mounting. Because this is a 50 mm stroke, rod bending from side loads is typically minimal, but for longer strokes always consider an external guide or a guided cylinder to protect the rod and seals.
Adjustable-stroke checklist
The rear cap has a screw that limits how far the piston can retract. By turning it, you shorten the stroke end by up to 30 mm from the nominal 50 mm maximum. It sets the mechanical stop position and does not regulate air pressure or speed.
You need another AirTAC SCJ adjustable-stroke cylinder with a 40 mm bore, 50 mm nominal stroke, -30 adjust range, PT ports, and TC centre trunnion mounting. The standard SC fixed-stroke cylinder is not a drop-in substitute because it lacks the rear adjusting mechanism.
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