Airtac SCJ40 Standard Cylinder SCJ40X40-20
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X40-20 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, 40mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke40 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X40-20
The SCJ40X40-20 is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end. A rear-cap screw lets you fine-tune the stroke by up to 20 mm, giving a 628 N push force at 0.5 MPa without swapping the cylinder.
This 40 mm bore model uses a 16 mm diameter piston rod and PT1/4 ports. The built-in adjustable air cushion (21 mm length) decelerates the load smoothly, and the tie-rod body (185 mm long in SCJ configuration) accepts basic, FA, LB, or TC mounting.
Airtac SCJ40 Standard Cylinder SCJ40X40-20 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X40-20 |
|---|---|
| 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.
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 SCJ40X40-20
| 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.
Where the Airtac SCJ40 Standard Cylinder SCJ40X40-20 Is Used
End-Stop Tuning
Fine-tune the retract or extend stop during machine commissioning without removing the cylinder or adding external hard stops.
Wear Compensation
Adjust the stroke end to compensate for tooling wear or seal compression over time, maintaining precise positioning in clamping fixtures.
Format Changeover
Quickly adapt the cylinder stroke for different product sizes on a packaging line by turning the rear adjusting screw.
Is the Airtac SCJ40 Standard Cylinder SCJ40X40-20 the Right Cylinder?
Choose the SCJ40 when you need to dial in an exact end position during commissioning or format changes. If 628 N push at 0.5 MPa is marginal, step up to the 50 mm bore SCJ50 (982 N push) for more force; if space is tight, the 32 mm bore SCJ32 (402 N push) may suffice. For a fixed, non-adjustable stroke, the standard SC series is a simpler alternative. This SCJ40X40-20 is a direct replacement for another AirTAC SCJ40 with a 40 mm nominal stroke, 20 mm adjust range, PT ports, and basic mounting.
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 SCJ40X40-20 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 greater than the pull force.
Yes, this is a genuine AirTAC SCJ40X40-20. It is a direct form-and-function match for any AirTAC SCJ40 adjustable-stroke cylinder with a 40 mm nominal stroke, a 20 mm adjustment range, PT ports, and basic mounting. Verify your existing port thread and mounting style match.
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