Airtac SCJ40 Standard Cylinder SCJ40X450-50
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X450-50 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø40mm bore, 450mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke450 mm
- Stroke adjust-50 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X450-50
The SCJ40X450-50 is a 40mm bore double-acting single-rod cylinder with a 50mm rear-end stroke adjustment, letting you fine-tune the end position in the field without swapping the unit. At 0.5 MPa it delivers 628 N push and 528 N pull, making it a solid mid-range actuator for applications that need a repeatable stroke tweak during commissioning or format changes.
This model has a 16mm diameter piston rod, PT1/4 ports, and a 21mm air cushion at each end to decelerate the load smoothly. The body length A is 185mm, and the nominal stroke of 450mm is well within the 1200mm maximum standard stroke for this bore. The stroke-adjust screw only sets the rear end-stop; it does not alter the cylinder's force output or speed capability.
Airtac SCJ40 Standard Cylinder SCJ40X450-50 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X450-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 450 mm |
| Stroke adjustment | Up to 50 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 SCJ40X450-50
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×450 | Nominal (maximum) stroke length in mm. |
| -50 | 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 SCJ40X450-50 Is Used
Commissioning & Setup
The 50mm adjust range allows technicians to dial in the exact stroke end-stop during machine commissioning without needing to order multiple fixed-stroke cylinders or fabricate external hard stops.
Format Changeovers
On packaging or assembly lines that run different product sizes, the rear screw lets operators quickly change the push or eject stroke length to suit a new format, minimizing downtime between batches.
Wear Compensation
In clamping or pressing fixtures where tooling or contact surfaces wear over time, the adjustable stroke end can be periodically advanced to maintain consistent engagement without replacing the cylinder.
Is the Airtac SCJ40 Standard Cylinder SCJ40X450-50 the Right Cylinder?
Choose the SCJ40 when you need a field-adjustable stroke in the 40mm bore class. If your force requirement is lower, stepping down to a 32mm bore SCJ saves space but drops push force to 402 N at 0.5 MPa. For higher force, the 50mm bore SCJ provides 982 N push at the same pressure. If you do not need the adjustable stroke feature, a fixed-stroke SC40 cylinder is a simpler, more cost-effective alternative.
For this 450mm stroke length, be mindful of side-loading on the rod. If the load is not guided and perfectly aligned, the extended rod can experience bending stress. In such cases, add an external linear guide or consider a guided cylinder. A direct replacement must match the 40mm bore, 450mm nominal stroke, 50mm adjust range, PT thread, and basic mounting configuration.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-50)
- ✓ 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 SCJ40X450-50 FAQ
At the standard operating pressure of 0.5 MPa, this 40mm bore cylinder generates 628 N of push force and 528 N of pull force. The push force is higher because the single rod reduces the effective piston area on the return stroke. The maximum operating pressure is 1.0 MPa, yielding a theoretical push force of 1130 N.
Yes, provided the mounting footprint and rod dimensions match. This SCJ model has a 16mm rod with M12x1.25 threads and PT1/4 ports. The key difference is the rear adjusting screw, which makes the body slightly longer than a fixed-stroke SC40. Ensure you have clearance for the adjuster and confirm the 50mm stroke reduction range is sufficient for your application.
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