Airtac SCJ40 Standard Cylinder SCJ40X45-40S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X45-40S 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, 45mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke45 mm
- Stroke adjust-40 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X45-40S
The SCJ40X45-40S is a 40 mm bore double-acting single-rod cylinder with a field-adjustable stroke end, giving you a 40 mm fine-tuning range on the 45 mm nominal stroke. At 0.5 MPa it delivers 628 N push and 528 N pull, making it a capable mid-range actuator for positioning tasks that need frequent tweaking without cylinder swaps.
A built-in magnet lets you mount CMSG/DMSG/EMSG sensors directly on the tie-rod barrel for clean end-of-stroke or mid-stroke sensing. The 16 mm rod, PT1/4 ports, and 21 mm air cushion are standard for this bore class, and the SCJ body length A is 185 mm—slightly longer than the fixed-stroke SC to house the rear adjusting screw.
Airtac SCJ40 Standard Cylinder SCJ40X45-40S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X45-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 45 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 SCJ40X45-40S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×45 | 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 SCJ40X45-40S Is Used
Commissioning Fine-Tuning
Dial in the exact stroke end position on a new assembly line without swapping cylinders or machining custom stops, saving hours of mechanical setup time.
Wear Take-Up on Stops
Compensate for gradual wear on external tooling stops by adjusting the cylinder's internal stroke end, maintaining precise part placement over extended production runs.
Format Changeover
Quickly reset the stroke length for different product sizes on a packaging or labeling machine, using the sensor-ready barrel to confirm the new position electronically.
Is the Airtac SCJ40 Standard Cylinder SCJ40X45-40S the Right Cylinder?
Step up to a 50 mm bore (982 N push at 0.5 MPa) if your load outgrows the 628 N force of the 40 mm SCJ. For applications where the stroke is permanently fixed after commissioning, the simpler SC40 series removes the adjusting mechanism and saves a little space. This SCJ40X45-40S is a direct replacement for any AirTAC SCJ40 with a 45 mm nominal stroke, 40 mm adjust range, PT ports, and a magnet-equipped barrel; the basic mount configuration accepts FA front flange or LB foot accessories from the F-SC40 range.
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 SCJ40X45-40S FAQ
At 0.5 MPa it produces 628 N pushing and 528 N pulling. The maximum operating force at 0.9 MPa is 1130 N push. Because it is a single-rod cylinder, the pull force is lower due to the 16 mm rod area.
Yes, provided the nominal stroke, port size, and mounting match. The SCJ body is slightly longer (185 mm) to accommodate the rear adjusting screw, so check your space envelope. The 40 mm adjustment range lets you fine-tune the stroke end position in the field.
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