The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X65-20S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 mm range without swapping the cylinder. Ø40mm bore, 65mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X65-20S is a double-acting, single-rod pneumatic cylinder that lets you fine-tune the stroke end position by up to 20 mm without swapping the unit. Its 40 mm bore delivers 628 N of push force at 0.5 MPa, making it a capable mid-range actuator for tasks that need on-the-fly mechanical adjustment.
A built-in magnet is included with this -S suffix model, so CMSG, DMSG, or EMSG solid-state sensors clamp directly onto the tie-rod barrel for reliable end-of-stroke sensing. The 16 mm diameter piston rod and PT1/4 port keep the cylinder compatible with common pneumatic circuits, while the 21 mm air cushion at each end helps manage kinetic energy smoothly.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X65-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 65 mm |
| Stroke adjustment | Up to 20 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. |
| ×65 | Nominal (maximum) stroke length in mm. |
| -20 | 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 setup, dial in the exact stop position for a pusher or clamp without re-machining brackets or adding external hard stops.
Quickly adjust the stroke end to accommodate different box sizes or product widths on a packaging line, reducing downtime between batches.
Take up mechanical play or seal wear over time by slightly extending the effective stroke, maintaining consistent contact pressure in pressing operations.
Choose the SCJ40 bore when your load needs roughly 628 N of push at standard shop air. If you require more force, stepping up to the 50 mm bore provides 982 N push at the same 0.5 MPa pressure. For applications where the stroke length is permanently fixed and you do not need field adjustment, the standard SC40 series offers a simpler, cost-effective alternative. When replacing an existing unit, match the 40 mm bore, the 65 mm nominal stroke, and the 20 mm adjustable range, ensuring the port thread is PT and the magnet option (-S) is present. The SCJ mounting subset for this model includes basic, FA front flange, LB foot, or TC centre trunnion with TCM1 bracket.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 628 N and the pull force is 528 N. The push force is higher because the single rod reduces the piston area on the return side.
No, the SCJ40X65-20S will drift or drop if air pressure is lost or the valve is centred. The rear adjusting screw only sets the stroke end point and does not act as a mechanical lock. You must add an external rod brake or pilot-operated check valve if load holding is required without live pressure.
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