Airtac SCJ40 Standard Cylinder SCJ40X20-20S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X20-20S 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, 20mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke20 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X20-20S
The SCJ40X20-20S is a double-acting, single-rod pneumatic cylinder from AirTAC, featuring a rear-cap adjusting screw that provides up to 20 mm of field-adjustable stroke-end retraction. With a 40 mm bore and 16 mm piston rod, it delivers a push force of 628 N at 0.5 MPa, making it a compact yet powerful solution for tasks requiring precise end-position tuning.
This model includes a built-in magnet (-S suffix), allowing direct mounting of CMSG, DMSG, or EMSG sensors along the tie-rod barrel for reliable electronic position feedback. The cylinder uses a PT1/4 port, a standard M12x1.25 rod thread, and operates with an adjustable air cushion of 21 mm to decelerate the piston smoothly at the end of its travel.
Airtac SCJ40 Standard Cylinder SCJ40X20-20S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X20-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 20 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 SCJ40X20-20S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×20 | 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 SCJ40X20-20S Is Used
Commissioning & Setup
Ideal for machine builders who need to dial in the exact stroke end during initial system commissioning, the 20 mm adjustment screw eliminates the need for trial-and-error cylinder swaps.
Sensor-Integrated Positioning
The built-in magnet works with clamp-on reed or solid-state sensors to provide end-of-stroke confirmation, perfect for automated assembly cells where the adjustable stop defines a critical part location.
Wear Compensation
In clamping or pressing fixtures, the adjustable stroke can be used to take up mechanical wear on tooling or workpieces over time, maintaining consistent clamping force without reprogramming.
Is the Airtac SCJ40 Standard Cylinder SCJ40X20-20S the Right Cylinder?
Choose the SCJ40X20-20S when your application demands a 20 mm nominal stroke that can be fine-tuned in the field without swapping the cylinder. If you need more force, stepping up to the 50 mm bore provides 982 N of push at the same 0.5 MPa. For applications where the stroke length is fixed and will never change, the standard SC40 fixed-stroke cylinder is a simpler, cost-effective alternative. This unit is a direct replacement for any AirTAC SCJ40 cylinder with a 20 mm nominal stroke, 20 mm adjust range, PT ports, 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 SCJ40X20-20S FAQ
The push force is 628 N at 0.5 MPa and 1130 N at the maximum operating pressure of 0.9 MPa. The pull force is lower due to the single 16 mm rod, providing 528 N at 0.5 MPa.
The rear adjusting screw physically limits the piston's stroke end by up to 20 mm. It is not a speed or force controller. To adjust piston speed, use external flow control valves in the cylinder's port lines.
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