Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-20S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 250mm stroke, G1/4 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ40 mm
- Stroke250 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-20S
The AirTAC SAIJ40X250-20-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the end position without swapping out the unit. With a nominal stroke of 250 mm and a 20 mm adjustment range, it provides a usable travel window of 230-250 mm. It delivers 628 N of push force and 528 N of pull force at 0.5 MPa, fitting a mid-range force class.
This variant uses a SUS304 stainless steel rod for corrosion resistance and includes a magnet for CMSE reed and DMSE electronic sensors. It features a PT tapered port (G1/8) and omits the FB, CA, CB, and CR mounts, supporting a reduced set of Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounting options. The rear adjuster acts purely as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-20S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 250 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 | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×250 | 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 SAIJ40BX250-20S Is Used
Machine Changeover
Dial in the 230-250 mm travel window during product size changes without replacing the cylinder or adding external shims.
End-Position Tuning
Fine-tune the retract stopper at commissioning to perfect the stroke end position for precise assembly tasks.
Variable End Stops
Adjust the travel end on the fly for packaging lines handling varying package lengths within the 20 mm range.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-20S the Right Cylinder?
Choose this 40 mm bore when you need more force than the 32 mm version (402 N push at 0.5 MPa) but want to step down from the 63 mm class (1559 N). The adjustable stroke is ideal for machine setup and product changeovers, letting you dial in the exact end-stop during commissioning instead of installing fixed external stops. Because the stroke is 250 mm, an external guide is recommended to manage side loads on the unsupported rod.
For load-holding without live pressure, this cylinder is not a lock; the rear screw is only a stop. You would need an external rod lock or a related type like SAIL or BSAI. To match this ISO 15552 replacement, specify bore 40, stroke 250, 20 mm adjustment, PT port, the reduced SAIJ mounting set, and the -S magnet.
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 SAIJ40BX250-20S FAQ
At 0.5 MPa, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At the maximum operating pressure of 1.0 MPa, it delivers 128 kgf.
The rear adjuster screw lets you shorten the effective travel from the nominal 250 mm down to 230 mm. It acts as a mechanical stop to fine-tune the end position, but it does not lock the load without continuous air pressure.
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