Airtac SCJ40 Standard Cylinder SCJ40X40-40S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X40-40S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 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-40 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X40-40S
The SCJ40X40-40S is a double-acting, single-rod pneumatic cylinder that puts stroke-end fine-tuning directly on the machine. Its rear adjusting screw offers a full 40 mm of adjustment range, letting you dial in the exact stopping position without swapping the cylinder or adding external hard stops. With a 16 mm diameter piston rod and PT1/4 ports, it delivers 628 N of push force at 0.5 MPa.
This model includes a built-in magnet (denoted by the -S suffix), so standard CMSG, DMSG, or EMSG reed and solid-state sensors clamp directly onto the tie-rod barrel for reliable end-of-stroke detection. The body length A is 185 mm, and the adjustable air cushion decelerates the piston smoothly at both ends, making it a solid choice for commissioning trials or format changeovers where the stroke length needs to be field-tuned.
Airtac SCJ40 Standard Cylinder SCJ40X40-40S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X40-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 40 mm |
| Stroke adjustment | Up to 40 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 SCJ40X40-40S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×40 | Nominal (maximum) stroke length in mm. |
| -40 | 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 SCJ40X40-40S Is Used
Commissioning & Setup
Field engineers can precisely dial in the actuator stroke end during initial machine setup, eliminating the need to cut and re-thread rod ends or fabricate custom external stops.
Wear Compensation
In clamping or pressing fixtures, the 40 mm adjustment range allows operators to easily take up slack from worn tooling or workpieces, maintaining consistent contact pressure without replacing the cylinder.
Format Changeovers
Packaging and assembly lines benefit from quick stroke adjustments when switching between product sizes, reducing downtime by allowing a single cylinder model to handle multiple positions.
Is the Airtac SCJ40 Standard Cylinder SCJ40X40-40S the Right Cylinder?
Choose the SCJ40 when your application needs up to 628 N of push force at 0.5 MPa and the ability to fine-tune the stroke end by up to 40 mm. If you require more force, stepping up to the SCJ50 provides 982 N of push force at the same pressure. For applications where the stroke is fixed and never needs adjustment, the standard SC fixed-stroke cylinder is a simpler, cost-effective alternative. This SCJ40X40-40S is a direct replacement for any AirTAC SCJ adjustable-stroke cylinder with a 40 mm bore, 40 mm nominal stroke, 40 mm adjust range, PT ports, and a built-in magnet.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-40)
- ✓ 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 SCJ40X40-40S FAQ
The push force is 628 N at 0.5 MPa and 1130 N at 0.9 MPa. The pull force is lower due to the single 16 mm rod, providing 528 N at 0.5 MPa. The adjusting screw does not change the force output; it only sets the stroke end position.
The rear-cap screw physically limits how far the piston can extend, shortening the stroke end by up to 40 mm from the nominal maximum. It is not a locking or holding brake—if air pressure is lost, the piston can drift. Use an external rod lock or pilot-operated check valve if the load must be held without pressure.
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