Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-20S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-20S 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 SAIJ40BX290-20S
The AirTAC SAIJ40X290-20-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. With a nominal 290 mm stroke and a 20 mm adjustment range, you can fine-tune the effective travel window anywhere between 270 and 290 mm during machine commissioning without adding external stops. It delivers 879 N of push force at 0.7 MPa, making it a solid choice for medium-duty positioning tasks.
This SKU features a SUS304 stainless steel rod for superior corrosion resistance and includes a standard magnet (-S) for electronic DMSE or reed CMSE position sensing. The extruded aluminum barrel integrates sensor grooves on both sides, and the PT tapered G1/4 port ensures a reliable, leak-free connection. The rear adjuster acts purely as a mechanical stop to set the retract end-position and does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-20S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-20S |
|---|---|
| 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 SAIJ40BX290-20S
| 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 SAIJ40BX290-20S Is Used
Machine Commissioning
Dial in the exact 270-290 mm retract position during setup, eliminating the need to machine custom spacers or swap cylinders when finalizing end-stops.
Product Changeover
Quickly adjust the travel end-position on automated lines handling varying package sizes, reducing downtime between production runs.
Sorting Diverter
Provides 879 N of push force at 0.7 MPa to deflect items on a conveyor, with the adjuster allowing precise tuning of the divert stroke.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-20S the Right Cylinder?
Choose this 40 mm bore when your application requires roughly 879 N of push force at 0.7 MPa. If your process needs 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 stroke is ideal for product changeovers, allowing you to dial in the exact end-position on the fly. For fixed travel without the adjusting screw, the standard AirTAC SAI cylinder is the direct alternative.
Because the 290 mm stroke is relatively long, the 16 mm rod requires an external guide to prevent excessive side-loading and premature seal wear. When replacing an ISO 15552 cylinder, match the 40 mm bore, 290 mm stroke, 20 mm adjustment, PT G1/4 port, and SUS304 rod material. Remember that the SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, intentionally omitting FB, CA, CB, and CR brackets. For applications requiring true load-holding without continuous air pressure, consider the SAIL or BSAI series instead of relying on the rear stopper.
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 SAIJ40BX290-20S FAQ
At 0.7 MPa operating pressure, this 40 mm bore cylinder provides 879 N of push force and 740 N of pull force. It can deliver up to 1130 N of push force at 0.9 MPa.
The rear adjuster screw allows you to shorten the effective travel from the nominal 290 mm down to 270 mm. This mechanical stopper sets the retract end-position but does not lock or hold the load without live air pressure.
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