Airtac SCJ40 Standard Cylinder SCJ40X200-20S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X200-20S 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, 200mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke200 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X200-20S
The SCJ40X200-20S is a double-acting, single-rod pneumatic cylinder that lets you fine-tune the stroke end position by up to 20 mm using the rear adjusting screw. With a 40 mm bore and 16 mm rod, it delivers 628 N of push force at 0.5 MPa, making it a solid performer for mid-range clamping and positioning tasks where the final stop point needs on-machine tweaking.
This model includes a built-in magnet (suffix -S), so you can directly mount CMSG/DMSG/EMSG reed or solid-state sensors on the tie-rod barrel for end-of-stroke feedback. The standard PT1/4 port and M12x1.25 rod thread keep it compatible with common AirTAC fittings, and the 21 mm air cushion at each end helps manage kinetic energy quietly.
Airtac SCJ40 Standard Cylinder SCJ40X200-20S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X200-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 200 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.
Theoretical Output Force (Ø40mm)
| 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.
Model Code: Airtac SCJ40 Standard Cylinder SCJ40X200-20S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×200 | 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.
Where the Airtac SCJ40 Standard Cylinder SCJ40X200-20S Is Used
End-Stop Commissioning
During machine bring-up, the 20 mm screw adjustment lets technicians dial in the exact retract or extend stop for a 40-bore pusher without swapping hard stops or reprogramming offsets.
Wear Take-Up on Clamps
A fixture clamp with a 200 mm stroke can be adjusted inward as the clamping pads wear, maintaining consistent grip force without replacing the cylinder or adding shims.
Format Changeover
On a packaging line, the adjustable stroke allows operators to quickly reset the end position for a new box size, reducing changeover time compared to a fixed-stroke actuator.
Is the Airtac SCJ40 Standard Cylinder SCJ40X200-20S the Right Cylinder?
Choose the SCJ40 when 628 N of push force (at 0.5 MPa) covers your load. If you need more muscle, the SCJ50 steps up to 982 N at the same pressure. For applications that don't require field-adjustable stroke, the simpler fixed-stroke SC40X200 is a direct alternative. This SCJ40X200-20S is a direct replacement for any AirTAC SCJ40X200-20S with a PT port, basic mount, and magnet; always match the bore, nominal stroke, and 20 mm adjust range to keep the same machine envelope and sensor setup.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-20)
- ✓ Required force at your working pressure
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Set the rear adjusting screw, then lock it before running.
- check Adjust end cushion screws for smooth stops.
- check Use SCJ mounting accessory (FA / LB / TC / TCM1).
- check Installation by qualified personnel per AirTAC docs.
Airtac SCJ40 Standard Cylinder SCJ40X200-20S FAQ
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 0.9 MPa is 1130 N. Because it is a single-rod cylinder, the push force is always greater than the pull force due to the area of the 16 mm rod.
Yes, if the original is a genuine AirTAC SCJ40X200-20S with a PT port, basic mounting, and a magnet. The adjustable stroke range, port size, and sensor compatibility are identical. Always verify the port thread type (PT vs G) and the magnet option to ensure sensors and fittings match.
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