Airtac SCJ40 Standard Cylinder SCJ40X35-20S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X35-20S 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, 35mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke35 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X35-20S
The SCJ40X35-20S is a 40mm bore double-acting single-rod cylinder that delivers 628 N of push force at 0.5 MPa, making it a compact workhorse for light clamping and positioning tasks. Its rear-cap adjusting screw provides up to 20 mm of stroke-end fine-tuning, so you can dial in the exact stopping point during commissioning or format changes without swapping the cylinder.
This model includes a built-in magnet (-S suffix), allowing CMSG/DMSG/EMSG reed and solid-state sensors to clamp directly onto the tie-rod barrel for reliable end-of-stroke detection. The 16 mm diameter piston rod and PT1/4 port thread keep the unit rigid, while the standard TPU seal operates from -20 to +70 °C.
Airtac SCJ40 Standard Cylinder SCJ40X35-20S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X35-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 35 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 SCJ40X35-20S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×35 | 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 SCJ40X35-20S Is Used
Commissioning & Setup
Fine-tune the stroke end by up to 20 mm on a new assembly line without removing the cylinder, speeding up initial machine setup and sensor alignment.
Small-Part Positioning
Adjust the stop position of a 40 mm bore pusher on a conveyor to handle different product widths, using the built-in magnet for precise end-of-stroke feedback.
Wear Compensation
Take up mechanical play in a clamping fixture over time by advancing the rear screw, maintaining consistent clamp force without replacing tooling.
Is the Airtac SCJ40 Standard Cylinder SCJ40X35-20S the Right Cylinder?
Choose the SCJ40 when you need field-adjustable stroke in a 40 mm bore class. If your load demands more force, step up to the SCJ50 (982 N push at 0.5 MPa); if space is tight, the SCJ32 offers 402 N. For applications that do not require stroke adjustment, the fixed-stroke SC series is a simpler, lower-cost alternative. A direct replacement must match the 40 mm bore, 35 mm nominal stroke, 20 mm adjust range, PT ports, basic mounting, and the -S magnet option.
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 SCJ40X35-20S FAQ
At 0.5 MPa the push force is 628 N and the pull force is 528 N. At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 1280 N. Because it is a single-rod cylinder, push force is always greater than pull force.
Yes, provided the bore (40 mm), port thread (PT1/4), and mounting style match. The SCJ adds up to 20 mm of stroke-end adjustment via the rear screw, making it a direct upgrade when you need field-adjustable stopping position without changing the cylinder body length significantly.
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