Airtac SCJ40 Standard Cylinder SCJ40X250-20S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X250-20S 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, 250mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke250 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X250-20S
The SCJ40X250-20S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, providing a 20 mm adjustment range via a rear-cap screw. With a 40 mm bore and 16 mm rod, it delivers 628 N of push force and 528 N of pull force at 0.5 MPa, making it a robust mid-range actuator for tasks requiring on-machine fine-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 end-of-stroke detection. The body length A(SCJ) is 185 mm, and the standard PT1/4 port and M12x1.25 rod thread ensure straightforward integration into common pneumatic circuits.
Airtac SCJ40 Standard Cylinder SCJ40X250-20S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X250-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 250 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 SCJ40X250-20S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×250 | 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 SCJ40X250-20S Is Used
Commissioning & Setup
Fine-tune the 250 mm stroke end position by up to 20 mm during initial machine setup, eliminating the need to shim or reposition the cylinder body to achieve perfect alignment.
Product Format Changeover
Quickly adjust the stop position for different product sizes on a packaging line. The 20 mm range allows operators to adapt to new formats without replacing the cylinder or mechanical stops.
Wear Compensation
Compensate for wear on tooling or grippers over time. The rear adjusting screw can be advanced to take up slack, maintaining consistent clamp or press depth without reprogramming.
Is the Airtac SCJ40 Standard Cylinder SCJ40X250-20S the Right Cylinder?
Select the SCJ40X250-20S when your application needs a 250 mm stroke with the ability to trim the end position by up to 20 mm for commissioning or format changes. If you need more force, step up to the 50 mm bore SCJ50 series, which provides 982 N of push at 0.5 MPa. For a fixed, non-adjustable stroke, the standard SC40 cylinder is a simpler alternative.
For a direct replacement, match the 40 mm bore, 250 mm nominal stroke, 20 mm adjustment range, PT1/4 port, basic mounting, and the -S magnet option. At this stroke length, ensure the rod is supported against side loads; if lateral forces are present, consider adding an external linear guide or switching to a guided cylinder.
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 SCJ40X250-20S FAQ
At the standard operating pressure of 0.5 MPa, this cylinder provides 628 N of push force and 528 N of pull force. The maximum push force at 0.9 MPa is 1130 N. The rear adjusting screw changes only the stroke end position, not the cylinder's force output.
Yes, the SCJ40X250-20S can replace an SC40 with a 250 mm stroke if you need the added 20 mm adjustment range. Ensure the port size (PT1/4), mounting style, and magnet option (-S) match your current setup. The SCJ body is slightly longer to accommodate the adjusting mechanism.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC SCJ Adjustable-Stroke Cylinders
Request a Quote for Airtac SCJ40 Standard Cylinder SCJ40X250-20S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.