The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X35-30 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, 35mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X35-30 puts a 30 mm field-adjustable stroke range into a compact 40 mm bore tie-rod body. At 0.5 MPa it delivers 628 N push and 528 N pull, driven by a 16 mm diameter piston rod, giving you enough force for light clamping, ejecting, or diverting tasks while letting you dial in the exact stop position during commissioning.
The rear adjusting screw shortens the nominal 35 mm stroke by up to 30 mm, so the effective stroke can be set anywhere from 5 mm to 35 mm without changing the cylinder. PT1/4 ports and a 21 mm air cushion are standard, and the body length A(SCJ) is 185 mm — slightly longer than the fixed-stroke SC40 to house the screw mechanism.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X35-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 35 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. |
| ×35 | 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.
During machine bring-up, technicians can back out the rear screw to shorten the stroke in 1 mm increments, finding the ideal end-stop for a gripper or pusher without re-machining brackets.
On a small packaging line switching between box heights, the 30 mm adjust range lets one SCJ40 handle multiple product sizes — just turn the screw to match the new stack height.
In a pad-printing fixture where a silicone pad compresses over time, the adjustable stroke compensates for pad wear by advancing the end-stop, maintaining consistent print pressure without swapping the cylinder.
Step up to the SCJ50 (982 N push at 0.5 MPa) if the 628 N push of this 40 mm bore is marginal for your load. If you never need to alter the stroke after installation, the simpler fixed-stroke SC40 costs less and shares the same mounting accessories. For a drop-in replacement, match the 40 mm bore, 35 mm nominal stroke, 30 mm adjust range, PT1/4 ports, basic mounting, and no magnet — any SCJ40X35-30 with the same suffix will fit.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, the 40 mm bore generates 628 N pushing force and 528 N pulling force (the difference is due to the 16 mm single rod). At the maximum 0.9 MPa operating pressure, push force reaches 1130 N.
The rear-cap adjusting screw sets the stroke end position within a 30 mm range — it does not control speed or force. Turning the screw changes where the piston stops on the extend stroke. Speed is controlled separately by flow controls in the port fittings. The screw is a mechanical stop, not a cushion or brake.
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