Airtac SCJ40 Standard Cylinder SCJ40X300-100
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X300-100 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 100 mm range without swapping the cylinder. Ø40mm bore, 300mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke300 mm
- Stroke adjust-100 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X300-100
The SCJ40X300-100 is a 40 mm bore double-acting single-rod pneumatic cylinder with a field-adjustable stroke end. A rear-cap adjusting screw lets you shorten the effective stroke by up to 100 mm from the 300 mm nominal maximum, giving a practical working range of 200–300 mm without changing the cylinder or adding external hard stops. At 0.5 MPa it delivers 628 N push and 528 N pull, and the 16 mm diameter rod threads M12x1.25 for standard knuckle mounting.
This model uses PT1/4 ports, TPU seals for a -20 to +70 °C operating range, and a 21 mm air cushion at each end to decelerate the piston smoothly. The SCJ body is a tie-rod design, slightly longer than a fixed-stroke SC of the same bore to house the adjusting mechanism; the A dimension for the SCJ40 series is 185 mm. It is a genuine AirTAC adjustable-stroke unit built for commissioning flexibility and format changeovers on packaging and assembly machines.
Airtac SCJ40 Standard Cylinder SCJ40X300-100 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X300-100 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 300 mm |
| Stroke adjustment | Up to 100 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 SCJ40X300-100
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×300 | Nominal (maximum) stroke length in mm. |
| -100 | 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 SCJ40X300-100 Is Used
Commissioning & Setup
Fine-tune the stroke end position during machine commissioning. The 100 mm adjustment range lets you dial in the exact stop point for a new product format without fabricating custom hard stops or swapping cylinders.
Format Changeovers
Quickly adapt to different box sizes or product widths on packaging lines. Operators can adjust the stroke end screw to match the new format in minutes, reducing changeover downtime on cartoners and case packers.
Wear Compensation
Take up mechanical wear in gripper fingers, pusher pads, or sealing bars over time. The rear screw lets you advance the stroke end slightly to maintain consistent contact pressure without replacing the entire actuator.
Is the Airtac SCJ40 Standard Cylinder SCJ40X300-100 the Right Cylinder?
Choose the SCJ40X300-100 when you need to dial in a stroke end position repeatedly during setup or after tooling wear, without the downtime of swapping cylinders. If 628 N push at 0.5 MPa is marginal, stepping up to a 50 mm bore (SCJ50) gives 982 N push at the same pressure, while a 32 mm bore (SCJ32) drops to 402 N push for lighter, more compact applications. For a fixed, non-adjustable stroke, the standard SC series is a simpler and slightly shorter alternative.
At 300 mm nominal stroke, side-loading and rod bending become important considerations. If the load is not guided, use an external guide rail or switch to a guided cylinder to protect the rod and bearing. For direct replacement, match an SCJ40 with a 300 mm nominal stroke, 100 mm adjust range, PT1/4 ports, and the same basic mounting configuration. The SCJ mounting subset includes FA front flange, LB foot, and TC centre trunnion with TCM1 bracket; FB flange and CA/CB clevis mounts are not available on this series.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-100)
- ✓ 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 SCJ40X300-100 FAQ
At 0.5 MPa the push force is 628 N and the pull force is 528 N (the difference is due to the single 16 mm rod reducing the piston area on the retract side). At the maximum operating pressure of 0.9 MPa, push force reaches 1130 N. The adjusting screw changes only the stroke end position, not the force output.
Only if you need the adjustable-stroke feature and can accommodate the slightly longer SCJ body. The SCJ40X300-100 has a nominal 300 mm stroke with up to 100 mm of rear-end adjustment. Mounting, port size (PT1/4), and rod thread (M12x1.25) are identical to the SC40 series, but you must select the same mounting style (basic, FA, LB, or TC) and magnet option for a direct fit.
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