Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-30S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-30S 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 SAIJ40BX250-30S
The AirTAC SAIJ40X250-30-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a 250 mm nominal stroke that can be fine-tuned down by up to 30 mm, creating a precise 220-250 mm usable travel window during commissioning. Delivering 879 N of push force at 0.7 MPa, it integrates seamlessly into standard setups using PT G1/4 ports and a 30 mm cushion length.
This variant features a SUS304 stainless steel rod for superior corrosion resistance and ships with a magnet (-S) for position sensing. You can mount CMSE reed or DMSE electronic switches directly into the sensor grooves on both sides of the extruded aluminum barrel. The rear adjuster acts purely as a mechanical stop to set the end position, meaning it will not hold a load without continuous live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-30S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-30S |
|---|---|
| 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 SAIJ40BX250-30S
| 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 SAIJ40BX250-30S Is Used
Product Changeovers
Dial in the 220-250 mm travel window on the fly during packaging line size changes, avoiding the need to physically swap out cylinders for different carton lengths.
End-Stop Calibration
Fine-tune the retract position during machine commissioning to prevent crashes, using the rear stopper to perfectly set the resting point without complex programming.
Corrosive Assembly Lines
Leverage the SUS304 stainless steel rod and 628 N pull force at 0.5 MPa for reliable component pressing in environments where moisture or mild chemicals are present.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-30S the Right Cylinder?
Choose this 40 mm bore when an application requires moderate thrust, or step up to the 50 mm bore (1374 N push at 0.5 MPa) for heavier loads. An adjustable stroke is ideal for product changeovers, letting you dial in the exact 220-250 mm end position without swapping cylinders or adding external stops. For load-holding without live air, select a SAIL or BSAI cylinder instead of relying on this adjuster. To match this ISO 15552 replacement exactly, specify: 40 mm bore, 250 mm stroke, 30 mm adjustment, PT G1/4 port, SUS304 rod, and the -S magnet.
Because the 250 mm stroke creates a longer unsupported rod extension, external guiding is recommended to prevent side-load wear on the 16 mm rod and M12x1.25 thread. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ40BX250-30S FAQ
The rear adjuster acts as a mechanical stop that lets you shorten the effective travel from the 250 mm nominal stroke down to a minimum of 220 mm. It sets the end position but does not lock the load without live air pressure.
At 0.7 MPa operating pressure, it provides 879 N of push force and 739 N of pull force. It operates at speeds between 30 and 800 mm/s.
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