Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-10S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-10S 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 SAIJ40BX250-10S
The AirTAC SAIJ40X250-10-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a 240-250 mm usable travel window, allowing you to trim the effective stroke by up to 10 mm during commissioning without swapping components. Delivering 628 N of push force at 0.5 MPa, it fits perfectly into medium-duty setups.
This variant features a SUS304 stainless steel rod for superior corrosion resistance and includes a magnet for CMSE and DMSE sensors. The extruded aluminum barrel includes sensor grooves on both sides, and the PT tapered ports ensure a secure pneumatic connection.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-10S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-10S |
|---|---|
| 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 SAIJ40BX250-10S
| 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 SAIJ40BX250-10S Is Used
Changeover Calibration
Dial in the exact 240-250 mm end position during product size changeovers without adding external mechanical stops.
Corrosive Assembly
Leverage the SUS304 stainless steel rod for pushing or clamping tasks in environments requiring high corrosion resistance.
Sensor-Driven Sorting
Utilize the integrated magnet with DMSE solid-state or CMSE reed switches to confirm retract positions on automated lines.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-10S the Right Cylinder?
Choose this 40 mm bore when you need more force than a 32 mm cylinder (402 N push at 0.5 MPa) but want to avoid the bulk of a 50 mm option (982 N). The 10 mm rear adjuster is ideal for fine-tuning the retract end position on product changeovers, functioning as a travel stop rather than a lock. For load-holding without live air pressure, consider an AirTAC SAIL or BSAI cylinder. To replace an ISO 15552 cylinder, match the 40 mm bore, 250 mm stroke, PT ports, and -S magnet.
Because the 250 mm stroke creates an extended lever arm, ensure external guiding is used to handle side loads. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, omitting FB, CA, CB, and CR. Operating speed ranges from 30-800 mm/s.
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 SAIJ40BX250-10S FAQ
At 0.5 MPa, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At 0.7 MPa, the push force increases to 879 N.
The rear adjuster acts as a mechanical stop that lets you shorten the 250 mm nominal stroke by up to 10 mm, creating a 240-250 mm travel window. It only sets the end position and does not lock the load without live air.
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