Airtac SCJ40 Standard Cylinder SCJ40X550-100S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X550-100S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 100 mm range without swapping the cylinder. Ø40mm bore, 550mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke550 mm
- Stroke adjust-100 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X550-100S
The SCJ40X550-100S is a double-acting, single-rod pneumatic cylinder with a 100 mm rear adjusting screw, letting you fine-tune the stroke end position from 450 mm up to the full 550 mm nominal stroke without swapping the unit. Its 16 mm diameter rod and PT1/4 ports deliver 628 N of push force at 0.5 MPa, making it a practical choice for mid-range automation tasks where the final stop point must be dialed in on the machine.
A built-in magnet (the -S suffix) allows CMSG/DMSG/EMSG solid-state or reed sensors to clamp directly onto the tie-rod barrel for non-contact position sensing. The body length A(SCJ) is 185 mm, and the adjustable air cushion decelerates the piston smoothly at both ends. Operating pressure ranges from 0.15 to 1.0 MPa, with a proof pressure of 1.5 MPa.
Airtac SCJ40 Standard Cylinder SCJ40X550-100S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X550-100S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 550 mm |
| Stroke adjustment | Up to 100 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 SCJ40X550-100S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×550 | Nominal (maximum) stroke length in mm. |
| -100 | 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 SCJ40X550-100S Is Used
Commissioning & Setup
During machine commissioning, the 100 mm adjustment screw lets technicians precisely set the end-of-stroke position for a pick-and-place arm, compensating for minor assembly tolerances without needing to re-machine any hard stops.
Product Format Changeover
On a packaging line, operators can quickly adjust the stroke of a pusher cylinder to handle different box sizes, reducing changeover time from minutes to seconds by simply turning the rear screw.
Wear Compensation
In a clamping fixture, the adjustable stroke can be periodically extended to take up wear on the contact pad, maintaining consistent clamping force without replacing the tooling or the cylinder.
Is the Airtac SCJ40 Standard Cylinder SCJ40X550-100S the Right Cylinder?
Choose this 40 mm bore when the 32 mm bore's 402 N push at 0.5 MPa is insufficient, but a 50 mm bore (982 N) would be oversized and consume more air. The 100 mm adjustment range is ideal for applications with frequent format changes or where the exact mechanical stop is hard to define during design. If your application requires a fixed, non-adjustable stroke, the standard SC series is a simpler alternative. For a direct replacement, match the 40 mm bore, 550 mm nominal stroke, 100 mm adjust range, PT port thread, and the -S magnet option.
At a 550 mm stroke, consider the rod's bending moment under side loads. If the load is not guided externally, adding an external linear guide or switching to a guided cylinder will protect the rod and seals from premature wear.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-100)
- ✓ 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 SCJ40X550-100S FAQ
At 0.5 MPa, the push force is 628 N and the pull force is 528 N. At the maximum operating pressure of 1.0 MPa, the theoretical push force is 1256 N. Because it is a single-rod cylinder, the push force is always greater than the pull force due to the rod area.
No. The SCJ cylinder does not hold its position if air pressure is lost or the valve is centered; the piston will drift. The rear adjusting screw only sets the stroke end point and the air cushion only decelerates the piston. To hold a load safely, you must add an external rod lock or a pilot-operated check valve.
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