Airtac SCJ40 Standard Cylinder SCJ40X65-30
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X65-30 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, 65mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke65 mm
- Stroke adjust-30 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X65-30
The SCJ40X65-30 is a double-acting, single-rod pneumatic cylinder with a 40 mm bore and a 65 mm nominal stroke, featuring a rear-cap adjusting screw that provides 30 mm of field-adjustable stroke-end reduction. At 0.5 MPa, it delivers 628 N of push force and 528 N on the pull stroke, making it a strong actuator for its compact size.
This tie-rod cylinder uses a 16 mm diameter piston rod and PT1/4 ports, with an adjustable air cushion to decelerate the piston smoothly. The body length A(SCJ) is 185 mm, offering a space-efficient footprint for machine builders who need to fine-tune the stroke end during commissioning or format changes without swapping the cylinder.
Airtac SCJ40 Standard Cylinder SCJ40X65-30 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X65-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 65 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 SCJ40X65-30
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×65 | 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 SCJ40X65-30 Is Used
Commissioning Fine-Tuning
During machine setup, the 30 mm adjusting screw lets technicians precisely set the stroke end to match the exact tooling position without re-plumbing or replacing the cylinder.
Product Format Changeover
On packaging lines running different box sizes, the SCJ40X65-30 allows operators to quickly adjust the pusher stroke end to accommodate a new product format with a simple screw turn.
Wear Compensation
In clamping or pressing fixtures, the adjustable stroke can be used to take up mechanical wear on contact pads over time, maintaining consistent clamping force without reprogramming the PLC.
Is the Airtac SCJ40 Standard Cylinder SCJ40X65-30 the Right Cylinder?
Choose the SCJ40X65-30 when you need to dial in the stroke end position on the machine, such as during initial setup or when handling different part sizes. If the force requirement is lower, stepping down to the 32 mm bore (402 N push at 0.5 MPa) saves space; if you need more power, the 50 mm bore delivers 982 N push. For applications where the stroke is permanently fixed, the standard SC40X65 is a simpler, cost-effective alternative.
For a direct replacement, match the 40 mm bore, 65 mm nominal stroke, 30 mm adjust range, PT1/4 ports, and basic mounting. If you need piston position sensing, order the -S magnet version. For strokes of 300 mm or more, evaluate side-loading and consider an external guide rail to protect the rod from bending.
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 SCJ40X65-30 FAQ
At 0.5 MPa, the push force is 628 N and the pull force is 528 N. The maximum push force at the 0.9 MPa operating limit is 1130 N. The rear adjusting screw does not alter the bore or the force output; it only sets the stroke end position within the 30 mm range.
Yes, provided the mounting, port size (PT1/4), and 65 mm nominal stroke match. The SCJ40X65-30 has the same body envelope as the SC40 but includes a rear adjusting screw that allows you to shorten the stroke end by up to 30 mm. Ensure the extra length of the screw housing does not interfere with your machine frame.
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