Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-75S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-75S 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 SAIJ40BX290-75S
The AirTAC SAIJ40X290-75-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster that trims the effective travel by up to 75 mm. This creates a usable 215-290 mm travel window, allowing precise end-position tuning at commissioning without swapping the cylinder or adding external stops. It delivers 628 N of push force and 528 N of pull force at 0.5 MPa, making it well-suited for medium-duty positioning tasks.
This SKU is built with a SUS304 stainless steel rod for superior corrosion resistance and includes an integrated magnet for position sensing. It accepts AirTAC CMSE reed and DMSE electronic solid-state switches in the dual-side sensor grooves. The extruded aluminum barrel maintains standard ISO 15552 mounting dimensions, while the available mounting set is reduced to Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-75S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-75S |
|---|---|
| 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 SAIJ40BX290-75S
| 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 SAIJ40BX290-75S Is Used
Product Changeover
Dial in the 215-290 mm stroke window during format size changes on packaging lines, using the rear screw to set new end positions rapidly without changing hardware.
Sensor Mapping
Leverage the built-in magnet with DMSE electronic sensors to confirm exact adjusted positions, ensuring the controller tracks the true end-of-travel after trimming.
Machine Setup
Fine-tune the retract end-stop during initial commissioning to dial out mechanical interference or align tooling perfectly before locking down the cycle.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-75S the Right Cylinder?
Choose this 40 mm bore when a 32 mm bore (providing 402 N push at 0.5 MPa) lacks the necessary thrust, but a 50 mm bore (982 N push at 0.5 MPa) would be physically oversized. The 75 mm adjustment range is ideal for machines requiring frequent product-size changeovers, replacing fixed-stroke SAI cylinders when a variable end-stop is needed. Because the nominal stroke is 290 mm, an external guide should be used to support the load and prevent excessive side loading on the rod.
For ISO 15552 replacement matching, verify a 40 mm bore, 290 mm stroke, 75 mm adjustment, PT tapered port threads, and the -S magnet option. Remember that the rear adjuster acts only as a travel stop and the air cushions handle deceleration; neither will hold a load without live air pressure. For true load-holding without continuous air, consider an AirTAC SAIL pneumatic lock, a BSAI clamp-lock cylinder, or an external pilot-operated check valve.
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 SAIJ40BX290-75S FAQ
At 0.5 MPa operating pressure, 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 screw lets you shorten the 290 mm nominal stroke by up to 75 mm, providing a usable travel window of 215 to 290 mm. It acts as a mechanical stop to fine-tune the end position and does not lock the load without live air.
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