Airtac SCJ40 Standard Cylinder SCJ40X450-30
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X450-30 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, 450mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke450 mm
- Stroke adjust-30 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X450-30
The SCJ40X450-30 puts a 30 mm field-adjustable stroke range into a 40 mm bore tie-rod body, giving you 628 N of push force at 0.5 MPa without reaching for a wrench to swap cylinders. Its 16 mm diameter single rod and PT1/4 ports keep the package compact, while the rear-cap screw lets you dial in the exact end position during commissioning or changeover.
This adjustable-stroke cylinder shares the same double-acting, single-rod architecture as the fixed SC series but adds a stroke-end screw that shortens the nominal 450 mm stroke by up to 30 mm. The body length A(SCJ) sits at 185 mm, and the air cushion buffers 21 mm of travel near each end. It is a genuine AirTAC unit built for filtered air at 0.15–1.0 MPa, with a proof pressure of 1.5 MPa.
Airtac SCJ40 Standard Cylinder SCJ40X450-30 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X450-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 450 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 SCJ40X450-30
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×450 | 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 SCJ40X450-30 Is Used
Commissioning & Setup
During machine bring-up, the 30 mm screw adjustment lets technicians fine-tune the end-of-stroke position without repeatedly swapping shims or hard stops, cutting setup time on a 450 mm travel axis.
Format Changeover
On packaging lines that switch between product sizes, the rear adjuster quickly shifts the stroke end by up to 30 mm, accommodating different box heights without replacing the cylinder or reprogramming servo axes.
Wear Take-Up
In clamping or pressing fixtures where tooling surfaces wear over time, the adjustable stroke compensates for material loss, maintaining consistent contact force without adding external shim packs.
Is the Airtac SCJ40 Standard Cylinder SCJ40X450-30 the Right Cylinder?
Choose the SCJ40X450-30 when you need to tweak the stroke end on a 40 mm bore machine axis without dismounting the cylinder. If your load demands more push, step up to the 50 mm bore SCJ50 series, which delivers 982 N at the same 0.5 MPa. For a fixed, non-adjustable stroke, the standard SC40 cylinder is the direct alternative.
At 450 mm of nominal stroke, rod deflection under side load becomes a practical concern. If the load is not guided externally, consider adding an external linear guide or switching to a guided cylinder to protect the rod and bearing. Replacement must match the 40 mm bore, 450 mm nominal stroke, 30 mm adjust range, PT ports, and basic mounting; the SCJ40X450-30 drops into the same footprint as any identically configured AirTAC SCJ40.
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 SCJ40X450-30 FAQ
At 0.5 MPa the cylinder delivers 628 N pushing and 528 N pulling (the pull force is lower because the 16 mm rod reduces the piston area on the return side). At the maximum operating pressure of 0.9 MPa, push force reaches 1130 N.
Yes, if you need the adjustable stroke feature. The SCJ shares the same bore, rod, port, and mounting interface as the SC series. Ensure the 30 mm adjust range, 450 mm nominal stroke, and PT thread match your existing setup. The SCJ body is slightly longer to house the adjusting screw.
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