Airtac SCJ40 Standard Cylinder SCJ40X145-30
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X145-30 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 mm range without swapping the cylinder. Ø40mm bore, 145mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke145 mm
- Stroke adjust-30 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X145-30
The SCJ40X145-30 is a 40 mm bore, double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end. A rear-cap adjusting screw provides up to 30 mm of fine-tuning, letting you set the exact stroke end position between 115 mm and 145 mm without swapping the cylinder. At 0.5 MPa it delivers 628 N of push force and 528 N on the pull stroke, driven by a 16 mm diameter piston rod.
Built on the SC tie-rod platform, this SCJ model uses a PT1/4 port and an M12x1.25 rod thread. The integral air cushion (21 mm long) decelerates the piston quietly near the end of travel. The body length A is 185 mm, slightly longer than a fixed-stroke SC to house the adjusting mechanism. This basic configuration ships with a TPU seal, PT threads, and no magnet, ready for standard industrial air service from -20 to +70 °C.
Airtac SCJ40 Standard Cylinder SCJ40X145-30 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X145-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 145 mm |
| Stroke adjustment | Up to 30 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 SCJ40X145-30
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×145 | Nominal (maximum) stroke length in mm. |
| -30 | 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 SCJ40X145-30 Is Used
Commissioning Fine-Tuning
During machine setup, the 30 mm rear screw lets technicians precisely match the cylinder stroke to the tooling position without re-machining brackets or adding external hard stops.
Product Format Changeover
On packaging or assembly lines running multiple product sizes, operators can quickly adjust the stroke end to suit a new box height or component thickness, minimizing downtime between batches.
Wear Compensation
In clamping or pressing fixtures where tooling surfaces gradually wear, the adjustable stroke allows periodic re-setting of the end position to maintain consistent contact force and part quality.
Is the Airtac SCJ40 Standard Cylinder SCJ40X145-30 the Right Cylinder?
Choose the SCJ40X145-30 when you need to dial in a stroke end point during commissioning or after a format change. If 628 N of push force at 0.5 MPa is marginal, stepping up to a 50 mm bore (SCJ50) provides 982 N at the same pressure. For applications where the stroke never needs field adjustment, the simpler fixed-stroke SC40 series is a cost-effective alternative. This adjustable-stroke cylinder is a direct replacement for another AirTAC SCJ40 with a 145 mm nominal stroke, 30 mm adjust range, PT1/4 ports, and basic mounting. If the rod sees side loads at this stroke length, add an external guide rail or consider a guided cylinder to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-30)
- ✓ 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 SCJ40X145-30 FAQ
At the standard 0.5 MPa operating pressure, the push force is 628 N and the pull force is 528 N. The push force is higher because the single rod reduces the effective piston area on the pull side. At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 1280 N.
Yes, provided the nominal stroke and port size match. The SCJ40X145-30 has the same bore, rod diameter, and PT1/4 ports as an SC40, but its body is slightly longer to house the rear adjusting screw. Ensure you have clearance for the 185 mm body length and that your application benefits from the 30 mm stroke-end adjustment range.
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