The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X80-30 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, 80mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X80-30 is a 40 mm bore double-acting single-rod cylinder with a field-adjustable stroke end, letting you fine-tune the extension by up to 30 mm without swapping the unit. Its 16 mm rod delivers 628 N of push force at 0.5 MPa, making it a solid choice for light clamping, diverting, and pick-and-place tasks where the final stop position needs dialling in during commissioning.
This tie-rod cylinder uses PT1/4 ports and an M12x1.25 rod thread, with a 21 mm air cushion at each end to decelerate the piston. The body length A(SCJ) is 185 mm, and the adjustable screw shortens the stroke end within the 30 mm range—it does not alter the 80 mm nominal maximum stroke or the cylinder’s force output.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X80-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 80 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. |
| ×80 | 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.
Dial in the exact stop position during machine setup without needing to machine custom stops or swap cylinders, saving hours on the factory floor.
Adjust the stroke end to align a diverter paddle precisely with different lane widths on a packaging conveyor, accommodating quick format changes.
Take up mechanical play or seal wear over time by slightly extending the effective stroke, maintaining consistent part contact in clamping fixtures.
Step up to the 50 mm bore SCJ if your application needs more push force—the SCJ50 delivers 982 N at 0.5 MPa versus this model’s 628 N. If you never need to alter the stroke after installation, the fixed-stroke SC40X80 offers the same mounting and force in a slightly shorter body. For a direct replacement, match an AirTAC SCJ40 cylinder with an 80 mm nominal stroke, a -30 adjust range, PT1/4 ports, and the same basic mounting configuration. At 80 mm stroke, rod bending from side loads is minimal, but an external guide rail is still recommended if the load is off-centre.
Adjustable-stroke checklist
At 0.5 MPa, this 40 mm bore cylinder generates 628 N of push force and 528 N of pull force. The push force is higher because the single rod reduces the piston area on the return side. At the maximum operating pressure of 1.0 MPa, the theoretical push force is 128 kgf.
Yes, if you need the ability to fine-tune the stroke end. The SCJ40X80-30 has the same 40 mm bore, 80 mm nominal stroke, and mounting footprint as the SC40X80, but adds a rear adjusting screw that lets you shorten the stroke by up to 30 mm. Ensure your mounting arrangement clears the slightly longer SCJ body.
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