Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-40
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 290mm 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
- Stroke290 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-40
The AirTAC SAIJ40X290-40 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the effective travel. With a nominal 290 mm stroke and a 40 mm adjustment range, it provides a usable 250-290 mm travel window. This enables precise end-position calibration at commissioning without swapping out the unit or adding external stops. The 40 mm bore delivers 879 N of push force at 0.7 MPa.
This variant uses a SUS304 stainless steel rod for superior corrosion resistance and features PT tapered G1/4 ports. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE or DMSE switches, though no magnet is installed on this specific configuration. The rear adjuster acts purely as a travel stop to set deceleration points and does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-40 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 290 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 SAIJ40BX290-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×290 | 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 SAIJ40BX290-40 Is Used
Variable End-Position Setup
Dial in the exact 250 to 290 mm travel distance during machine commissioning to accommodate different material thicknesses without installing external stopper blocks.
Product Size Changeover
Quickly shorten the retract stroke by up to 40 mm when switching the production line to a new package size, minimizing downtime between runs.
Corrosive Assembly Lines
Leverage the SUS304 stainless steel rod for reliable actuation in washdown or mildly corrosive manufacturing environments where carbon steel would degrade.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-40 the Right Cylinder?
Select this 40 mm bore model when an application requires 879 N of thrust at 0.7 MPa but needs on-the-fly travel tuning during product changeovers. If your process requires less force, stepping down to a 32 mm bore yields 563 N; if you need more clamping power, stepping up to a 50 mm bore provides 1374 N. The adjustable end-stop is ideal for variable end positions, whereas a fixed SAI cylinder is better suited for repetitive single-stroke tasks.
Because the 290 mm stroke exceeds 300 mm when fully extended, the 12 mm rod and M12x1.25 thread should be paired with an external guide to manage side-load risks. For dimensionally interchangeable ISO 15552 replacement, match the 40 mm bore, 290 mm stroke, 40 mm adjuster, PT G1/4 port, and Basic, FA, LB, TC, FTC, TCM1, or TCM2 mounting. Note that this SAIJ configuration omits the FB, CA, CB, and CR mounts. If the machine requires true load-holding without continuous air, consider the SAIL or BSAI series instead.
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 SAIJ40BX290-40 FAQ
The rear adjuster screw acts as an external stopper that lets you shorten the effective stroke from 290 mm down to 250 mm. It sets the travel end and works with the air cushion to decelerate the piston, but it is not a lock and will not hold the load without live air pressure.
At a 0.7 MPa operating pressure, the 40 mm bore provides 879 N of push force and 739 N of pull force. The maximum thrust is 128 kgf at 1.0 MPa.
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