The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X40-20S 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, 40mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X40-20S brings field-adjustable stroke control to the 40 mm bore class, delivering 628 N of push force at 0.5 MPa and up to 1130 N at the maximum operating pressure of 0.9 MPa. A rear-cap adjusting screw lets you shorten the stroke end by up to 20 mm without removing the cylinder from the machine, making it ideal for commissioning fine-tuning or format changeovers on packaging and assembly stations.
The built-in magnet (denoted by the -S suffix) allows CMSG, DMSG, or EMSG solid-state and reed sensors to clamp directly onto the tie-rod barrel for reliable end-of-stroke detection. With a 16 mm piston rod, PT1/4 ports, and a 21 mm air cushion, this double-acting single-rod cylinder handles speeds from 30 to 800 mm/s and operates on standard filtered air at 0.15–1.0 MPa.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X40-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 40 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. |
| ×40 | 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.
Dial in the exact stroke end position during machine setup without swapping cylinders or machining spacer blocks, saving hours of mechanical work.
Quickly adjust the push stroke for different box or carton sizes on a packaging line by turning the rear screw, reducing downtime between batches.
Compensate for jaw or pad wear in a clamping fixture over time by advancing the stroke end slightly, maintaining consistent clamp force without replacing the tooling.
Choose the SCJ40X40-20S when you need to dial in a precise end position on a 40 mm bore platform without adding external hard stops. If your force requirement grows, stepping up to the 50 mm bore SCJ delivers 982 N of push at the same 0.5 MPa. For applications where the stroke must remain absolutely fixed and repeatable without any adjustment, the standard SC fixed-stroke cylinder is a simpler, lower-cost alternative. This model directly replaces any AirTAC SCJ adjustable-stroke cylinder of the same 40 mm bore, 40 mm nominal stroke, 20 mm adjustment range, PT port thread, and built-in magnet.
Adjustable-stroke checklist
At 0.5 MPa, the cylinder produces 628 N of push force and 528 N of pull force (the pull force is lower due to the 16 mm rod area). At the maximum operating pressure of 1.0 MPa, theoretical push force reaches 1280 N.
A standard SC cylinder of the same bore and stroke will fit the same mounting footprint, but you will lose the rear adjusting screw. If you need to keep the field-adjustable stroke feature, you must replace it with another SCJ adjustable-stroke cylinder with the matching bore, nominal stroke, and adjustment range.
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