Airtac SCJ40 Standard Cylinder SCJ40X450-20
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X450-20 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 SCJ40X450-20
The SCJ40X450-20 is a double-acting, single-rod pneumatic cylinder that puts 628 N of push force at your disposal at 0.5 MPa, with the added flexibility of a 20 mm rear adjusting screw. This screw lets you dial in the exact stroke end position—from 430 mm up to the full 450 mm nominal length—without swapping the cylinder or adding external hard stops, making it a practical choice for commissioning and format changeovers.
Built on a robust tie-rod construction with a 16 mm diameter piston rod and PT1/4 ports, the cylinder body length (A dimension) is 185 mm. It includes an adjustable air cushion to decelerate the piston smoothly, and with a maximum operating pressure of 1.0 MPa, the push force can reach 1130 N for applications that need a temporary force boost.
Airtac SCJ40 Standard Cylinder SCJ40X450-20 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X450-20 |
|---|---|
| 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 SCJ40X450-20
| 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 SCJ40X450-20 Is Used
Commissioning & Fine-Tuning
Ideal for machine builders during initial setup. The 20 mm adjustment screw allows precise, tool-free calibration of the stroke end position to perfectly align with mating parts, eliminating the need to cut and re-thread piston rods.
Wear Compensation on Stops
In high-cycle pick-and-place or stop-gate applications, mechanical stops can wear over time. The SCJ's adjustable stroke lets operators quickly take up this slack to maintain precise positioning without disassembling the actuator.
Multi-Format Packaging Lines
When a packaging machine switches between product sizes, the push stroke often needs a slight change. The rear adjusting screw enables a fast, repeatable stroke-end changeover, reducing downtime between production runs.
Is the Airtac SCJ40 Standard Cylinder SCJ40X450-20 the Right Cylinder?
Choose this 40 mm bore model when your application needs around 628 N of push force at standard plant pressure. If you require more force, stepping up to the SCJ50 series provides 982 N of push force at the same 0.5 MPa. For applications that do not require field-adjustable stroke length, the fixed-stroke SC40 series offers a simpler, more cost-effective alternative. This cylinder is a direct replacement for any AirTAC SCJ40 cylinder with a 450 mm nominal stroke and a 20 mm adjustment range using PT ports.
For this 450 mm stroke length, be mindful of side loads. Long strokes increase the risk of rod buckling or uneven seal wear if the load is not guided. If your application involves any lateral force, pair the cylinder with an external guide rail or consider a guided cylinder assembly to ensure long service life.
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 SCJ40X450-20 FAQ
At the standard operating pressure of 0.5 MPa, this cylinder generates 628 N of push force and 528 N of pull force. The pull force is lower due to the area of the 16 mm piston rod. The maximum push force at the 1.0 MPa pressure limit is 1130 N.
Yes, provided the mounting style, port thread (PT), and magnet option match. The SCJ40X450-20 has the same envelope as a fixed-stroke SC40 but includes a rear adjusting screw for a 20 mm stroke-end adjustment range. Ensure you have the necessary axial clearance for the longer rear cap.
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