The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X275-20S 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, 275mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X275-20S is a double-acting, single-rod pneumatic cylinder that puts stroke fine-tuning directly on the machine. Its rear-cap adjusting screw lets you shorten the stroke end by up to 20 mm without removing the cylinder, which is invaluable during commissioning or format changeovers. With a 16 mm piston rod and PT1/4 ports, this 40 mm bore unit delivers 628 N of push force at 0.5 MPa.
A built-in magnet is included in this -S model, so you can clamp CMSG, DMSG, or EMSG reed and solid-state sensors directly onto the tie-rod barrel for end-of-stroke detection. The body length A is 185 mm, and the adjustable air cushion decelerates the piston smoothly at both ends. Operating pressure spans 0.15–1.0 MPa, and the standard TPU seal handles ambient temperatures from -20 to +70 °C.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X275-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 275 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. |
| ×275 | 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.
The 20 mm adjustment screw allows technicians to dial in the exact stroke end position during initial machine setup without swapping cylinders or fabricating hard stops.
Quickly adapt the cylinder's end position for different product sizes on packaging or assembly lines, reducing downtime between batches.
Fine-tune the retract or extend stop over the cylinder's service life to compensate for tooling wear, maintaining consistent process quality.
This 40 mm bore cylinder generating 628 N of push at 0.5 MPa suits many medium-force positioning tasks. If your load requires a step up in force, the 50 mm bore SCJ50 series provides 982 N at the same pressure. For purely fixed-stroke applications where the adjustment screw is unnecessary, the standard SC series offers a simpler, cost-effective alternative. A direct replacement must match the 40 mm bore, 275 mm nominal stroke, 20 mm adjustable range, PT thread, and the -S magnet option.
At a 275 mm stroke, the rod is well-supported, but any significant side load should be managed with an external guide rail or by switching to a guided cylinder to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 628 N and the pull force is 528 N. The maximum push force at the 0.9 MPa operating limit is 1130 N. Because it is a single-rod cylinder, the push force is greater than the pull force due to the rod area.
A rear-cap screw mechanically limits the piston's stroke end within a 20 mm range, setting the stopping point. It does not lock or hold the piston in place; if air pressure is lost, the rod can drift. For position holding without pressure, you need an external rod lock or pilot-operated check valve.
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