The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X20-20 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, 20mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X20-20 is a 40mm bore, double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end. A rear-cap screw provides up to 20mm of stroke reduction from the 20mm nominal maximum, letting you fine-tune the end position during commissioning or format changes without swapping the cylinder. At 0.5 MPa, it delivers 628 N push and 528 N pull, using a 16mm diameter piston rod.
The tie-rod body is 185mm long (A dimension) and features a PT1/4 port with an M12x1.25 rod thread. Integrated air cushioning, adjustable via needle valves, decelerates the piston over the final 21mm of travel. This basic model comes with TPU seals for standard -20 to +70°C operation and PT threads.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X20-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 20 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. |
| ×20 | 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.
Fine-tune the retract stroke end position during machine setup or after maintenance, using the rear screw to dial in the exact stop point within a 20mm window.
Adjust the stroke end to accommodate slight variations in workpiece thickness on a clamping or pressing fixture, preventing part damage or incomplete clamping.
Take up mechanical play or seal wear in a linkage over time by incrementally adjusting the cylinder's stroke end, maintaining consistent machine timing without replacing components.
Choose the SCJ40 when you need a compact, adjustable end-stop in the 40mm bore class. If you require more force, step up to the 50mm bore SCJ50, which provides 982 N of push at the same 0.5 MPa. For applications needing a fixed, non-adjustable stroke, the standard SC40 series is a simpler alternative. This model is a direct replacement for any AirTAC SCJ40X20-20 with PT ports and basic mounting. For strokes of 300mm or more, evaluate side-loading on the 16mm rod and consider an external guide.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, the push force is 628 N and the pull force is 528 N. The maximum push force at the 0.9 MPa upper limit is 1130 N.
A screw in the rear cap acts as an internal, adjustable end-stop for the piston. Turning the screw changes the retracted stroke end position, shortening the effective stroke by up to 20mm from the 20mm nominal maximum. It does not adjust force or speed.
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