Airtac SCJ40 Standard Cylinder SCJ40X30-20S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X30-20S 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, 30mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke30 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X30-20S
The SCJ40X30-20S is a double-acting, single-rod pneumatic cylinder from AirTAC, engineered with a rear-cap adjusting screw that provides up to 20 mm of field-adjustable stroke-end reduction. This allows fine-tuning of the piston stop position without removing the cylinder from the machine, ideal for commissioning and format changes. The built-in magnet allows direct mounting of CMSG/DMSG/EMSG sensors for reliable end-of-stroke detection.
With a 40 mm bore and a 16 mm piston rod, this cylinder delivers a push force of 628 N at 0.5 MPa and can reach 1130 N at its maximum operating pressure of 0.9 MPa. The PT1/4 port, M12x1.25 rod thread, and 21 mm air cushion are standard for this bore size. The body length A(SCJ) is 185 mm, making it a compact solution for applications requiring a short, adjustable stroke with sensor feedback.
Airtac SCJ40 Standard Cylinder SCJ40X30-20S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X30-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 30 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 SCJ40X30-20S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×30 | 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 SCJ40X30-20S Is Used
Commissioning & Setup
Fine-tune the end position of a stop gate on a conveyor during initial machine setup, dialing in the exact stroke needed without swapping out the cylinder.
Wear Compensation
Adjust the stroke end on a clamping fixture to compensate for the gradual wear of a contact pad, maintaining consistent clamping force over the pad's service life.
Format Changeover
Quickly change the stroke of a pusher arm on a packaging machine to handle different product sizes, using the rear screw to set a new, shorter end position.
Is the Airtac SCJ40 Standard Cylinder SCJ40X30-20S the Right Cylinder?
Choose the SCJ40X30-20S when your application requires a nominal 30 mm stroke that you need to fine-tune down by up to 20 mm during setup. If you need more force, stepping up to a 50 mm bore provides 982 N of push force at the same 0.5 MPa pressure. For a fixed, non-adjustable stroke, the standard SC series is a simpler, more cost-effective alternative. This model is a direct replacement for any AirTAC SCJ40X30-20S cylinder with a PT port, basic mounting, and a magnet.
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 SCJ40X30-20S FAQ
At the standard 0.5 MPa operating pressure, the cylinder provides a push force of 628 N and a pull force of 528 N. The maximum push force at 0.9 MPa is 1130 N. The pull force is lower due to the area of the 16 mm piston rod.
The rear adjusting screw mechanically limits the piston's stroke end, allowing you to shorten the 30 mm nominal stroke by up to 20 mm. It is not a locking device; the piston will not hold its position if air pressure is lost. For load holding without pressure, an external rod lock or pilot-operated check valve is required.
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