Airtac SCJ40 Standard Cylinder SCJ40X225-20
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X225-20 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, 225mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke225 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X225-20
The SCJ40X225-20 is a double-acting, single-rod pneumatic cylinder that puts stroke-end adjustment directly on the machine. A rear-cap screw lets you shorten the effective stroke by up to 20 mm, so commissioning engineers can dial in the exact stop position without adding external hard stops or swapping cylinders. With a 40 mm bore and 16 mm rod, it delivers 628 N of push force at 0.5 MPa (1130 N at 0.9 MPa), making it a solid mid-range actuator for positioning and clamping tasks.
This model uses a 225 mm nominal stroke, well within the 1200 mm maximum for the 40 mm bore. The body length A dimension is 185 mm, and the adjustable cushion is 21 mm long. Ports are PT1/4, and the rod thread is M12x1.25. As a genuine AirTAC tie-rod cylinder, it is built for filtered-air service from 0.15 to 1.0 MPa and operates reliably between -20 and +70 °C with the standard TPU seal.
Airtac SCJ40 Standard Cylinder SCJ40X225-20 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X225-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 225 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 SCJ40X225-20
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×225 | 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 SCJ40X225-20 Is Used
Commissioning & Setup
Dial in the exact stop position during machine bring-up without machining custom stops. The 20 mm rear screw lets technicians fine-tune the 225 mm stroke on the fly.
Product Changeover
Adjust the stroke end to accommodate different product sizes on a packaging or sorting line. The SCJ40X225-20 handles format changes quickly with a simple screw adjustment.
Wear Compensation
Take up mechanical play or tooling wear over time by slightly shortening the stroke. This keeps clamping force consistent without replacing the cylinder or reworking fixtures.
Is the Airtac SCJ40 Standard Cylinder SCJ40X225-20 the Right Cylinder?
Choose the SCJ40X225-20 when you need to fine-tune the stroke end during setup or after tooling wear. If you require more force, step up to the 50 mm bore, which provides 982 N push at 0.5 MPa; for a lighter, more compact solution, the 32 mm bore offers 402 N. If your application does not need field adjustability, the fixed-stroke SC40X225 is a simpler, cost-effective alternative. For direct replacement, match the 40 mm bore, 225 mm nominal stroke, 20 mm adjust range, PT1/4 ports, and basic mounting style.
At a 225 mm stroke, the rod is well supported for most axial loads, but if the application introduces side forces, consider adding an external linear guide or switching to a guided cylinder to protect the rod bearing and seal from premature wear.
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 SCJ40X225-20 FAQ
At 0.5 MPa, push force is 628 N and pull force is 528 N (the difference is due to the single 16 mm rod). At the maximum operating pressure of 0.9 MPa, push force reaches 1130 N. The theoretical maximum at 1.0 MPa is 128 kgf.
A rear-cap adjusting screw shortens the stroke end by up to 20 mm; the 225 mm rating is the nominal maximum. Pick SCJ when you need to fine-tune the end position during setup, changeover, or maintenance. If your stroke is fixed and never needs field adjustment, the standard SC series is the simpler choice.
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