Airtac SAIJ40 Adjustable Cylinder SAIJ40X300-50S
The AirTAC SAIJ40 Adjustable Cylinder SAIJ40X300-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 300mm stroke, G1/4 air ports and adjustable end cushioning. Its standardized mounting interface makes it interchangeable with other ISO 15552 cylinders at the mounting interface.
- BoreØ40 mm
- Stroke300 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40X300-50S
The AirTAC SAIJ40X300-50-S is a double-acting, double-rod ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. The integrated -S magnet allows seamless position sensing with AirTAC CMSE reed and DMSE electronic solid-state switches.
With a 300mm nominal stroke and a 50mm adjustment range, this model provides a usable travel window of 250-300mm. This built-in rear stopper allows you to fine-tune the retract end-position during commissioning without adding external stops. The adjuster acts solely as a travel stop to set deceleration limits and does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40X300-50S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40X300-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 300 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| 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, 30 mm |
| Max stroke | Up to 1200 mm |
Specifications follow the official AirTAC SAI series datasheet and ISO 15552 dimensions. Confirm against the product label before installation. Port options: G (BSPP) / NPT.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 528 N | 528 N |
| 0.7 MPa | 739 N | — |
| Max (@1.0 MPa) | 108 kgf | |
Double-rod model: the rod passes through the rear cover, so both piston faces lose rod area and push is shown at the annular-area value. Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ40 Adjustable Cylinder SAIJ40X300-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×300 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAI-family variants: SAID (double rod), SAIJ (adjustable stroke), SAIL (with lock), SAIF (with valve), BSAI (enclasp / clamp-lock), and SAI-S with built-in magnet. Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B); seals: TPU (blank) / Viton H / NBR N.
Where the Airtac SAIJ40 Adjustable Cylinder SAIJ40X300-50S Is Used
Machine Changeover
Dial in the 250-300mm travel window during product size transitions without replacing the cylinder or repositioning hard stops.
End-Position Tuning
Fine-tune the retract stroke limit at commissioning to perfect process timing and absorb mechanical tolerance variations.
Adjustable Diversion
Set precise actuation endpoints for sorting mechanisms where stroke length needs on-the-fly adaptation.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40X300-50S the Right Cylinder?
Choose this 40mm bore adjustable cylinder when your setup requires variable end-stops or frequent product changeovers, avoiding the need to physically swap out a fixed-stroke SAI cylinder. Because the 300mm stroke is relatively long, the 16mm rod will experience leverage forces, so an external guide is recommended to prevent side-load binding.
This SAIJ configuration includes a standard carbon steel rod and PT tapered port threads. It supports a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR brackets. For applications requiring position holding without live air, consider the SAIL pneumatic lock or BSAI clamp-lock series instead of relying on the rear adjuster.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
- ✓ Side load — consider a guided cylinder
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (FA/FB/CA/CB/LB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAIJ40 Adjustable Cylinder SAIJ40X300-50S FAQ
The 300mm nominal stroke can be adjusted backward by up to 50mm using the rear screw, providing a usable travel window of 250-300mm to fine-tune the retract end position.
It operates at speeds between 30 and 800 mm/s.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
Fast Reply
Most inquiries answered within 7-8 hours.
Request a Quote for Airtac SAIJ40 Adjustable Cylinder SAIJ40X300-50S
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