Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-30
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-30 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 SAIJ40BX290-30
The AirTAC SAIJ40X290-30 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the 290 mm nominal stroke by up to 30 mm for a precise 260-290 mm usable travel window. It delivers 628 N of push force and 528 N of pull force at 0.5 MPa, utilizing a G1/4 port and a 30 mm cushion length to manage end-of-travel energy. The extruded aluminum barrel features sensor grooves on both sides, ready for future automation upgrades.
This specific configuration features a SUS304 stainless steel rod (option B) for superior corrosion resistance and uses PT tapered port threads for a robust pneumatic seal. Because the 290 mm stroke is relatively long for the 16 mm rod, an external guide rail is recommended to prevent excessive side-loading. The rear adjuster acts purely as a mechanical stop to fine-tune the end position during commissioning, and does not lock the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-30 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-30 |
|---|---|
| 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 SAIJ40BX290-30
| 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 SAIJ40BX290-30 Is Used
Machine Changeover
Quickly fine-tune the 260-290 mm travel window during product size transitions without disassembling the actuator assembly.
Variable End Stops
Dial in the exact retract position on packaging lines to accommodate different carton widths on the fly.
Setup Calibration
Use the rear stopper screw to precisely set the end-of-stroke datum during initial machine commissioning.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-30 the Right Cylinder?
Select this 40 mm bore adjustable-stroke cylinder when a machine setup requires variable end-stops or frequent product-size changeovers, eliminating the need to physically swap out a fixed-stroke SAI cylinder. If your application requires less force, stepping down to a 32 mm bore yields 402 N of push at 0.5 MPa; stepping up to a 50 mm bore provides 982 N. For holding loads dynamically without live air pressure, this standard SAIJ adjuster will not suffice, so consider an AirTAC SAIL (air-released lock) or BSAI (clamp-lock) cylinder instead.
When matching ISO 15552 interchangeable footprint dimensions, ensure you specify the 40 mm bore, 290 mm stroke, 30 mm adjustment range, PT tapered ports, SUS304 (B) rod material, and no magnet. This SAIJ model supports a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR variants.
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 SAIJ40BX290-30 FAQ
At an operating pressure of 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 screw allows you to mechanically shorten the 290 mm nominal stroke by up to 30 mm, creating a usable travel window of 260-290 mm. This stopper only sets the end position and does not function as a lock to hold the load without air pressure.
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