Airtac SCJ40 Standard Cylinder SCJ40X450-20S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X450-20S 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, 450mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke450 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X450-20S
The SCJ40X450-20S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke, providing a nominal 450mm maximum reach. Its rear-cap adjusting screw allows the stroke end position to be fine-tuned by up to 20mm without removing the cylinder, making it ideal for commissioning and format changes. At 0.5 MPa, it delivers 628 N of push force and 528 N on the pull stroke, driven through a 16mm diameter piston rod.
This model includes a built-in magnet (-S suffix), enabling direct mounting of CMSG, DMSG, or EMSG sensors along the tie-rod barrel for precise, non-contact position feedback. The standard TPU seals and PT ports suit general industrial environments, with an operating pressure range of 0.15–1.0 MPa and a 21mm air cushion to decelerate the piston smoothly at stroke end.
Airtac SCJ40 Standard Cylinder SCJ40X450-20S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X450-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 450 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 SCJ40X450-20S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×450 | 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 SCJ40X450-20S Is Used
Commissioning & Setup
Fine-tune the end-of-stroke position during machine commissioning to perfectly align with tooling or stops, eliminating the need for shims or mechanical adjustments.
Product Changeover
Quickly adjust the stroke to accommodate different product sizes on a packaging or sorting line, reducing downtime between production runs.
Wear Compensation
Periodically adjust the stroke end to compensate for mechanical wear in grippers or contact surfaces, maintaining consistent clamping or pressing force over time.
Is the Airtac SCJ40 Standard Cylinder SCJ40X450-20S the Right Cylinder?
Choose the SCJ40X450-20S when you need to dial in a precise stroke end position on a 40mm bore platform without swapping the cylinder. If your application requires more force, stepping up to a 50mm bore SCJ provides 982 N of push force at the same 0.5 MPa pressure. For applications where the stroke length is fixed and never needs adjustment, the standard SC40X450 fixed-stroke cylinder is a simpler, more cost-effective alternative. This SCJ model is a direct replacement for any AirTAC SCJ40X450-20S with a PT port and built-in magnet. For a 450mm stroke, ensure the rod is adequately supported against side loads; consider adding an external guide rail or switching to a guided cylinder if lateral forces are present.
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 SCJ40X450-20S FAQ
The theoretical push force at 0.5 MPa is 628 N, and the pull force is 528 N due to the 16mm rod reducing the piston area on the return stroke. At the maximum operating pressure of 1.0 MPa, the push force reaches 1256 N.
Yes, the SCJ40X450-20S shares the same mounting footprint and port sizes as a fixed-stroke SC40. The adjustable stroke feature adds flexibility, but the overall body length is slightly longer to accommodate the rear adjusting screw mechanism.
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