Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-20 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 SAIJ40BX290-20
The AirTAC SAIJ40X290-20 is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a nominal 290 mm stroke that can be fine-tuned backward by up to 20 mm, yielding a precise 270-290 mm usable travel window. Delivering 879 N of push force at 0.7 MPa, it fits perfectly into medium-duty setups. This configuration features a SUS304 stainless steel rod (code B) for superior corrosion resistance and PT tapered port threads.
The rear adjuster acts purely as a mechanical stop to set the end position and works alongside the standard air cushions to decelerate the load. It does not lock or hold the load without continuous live air pressure. For operations requiring position holding without air, an external pilot-operated check valve or a related SAIL locking cylinder is necessary.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-20 |
|---|---|
| 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 SAIJ40BX290-20
| 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 SAIJ40BX290-20 Is Used
Machine Commissioning
Dial in the exact 270-290 mm end-stop during initial setup to perfect the seating force without machining new hard stops.
Product Changeovers
Quickly adjust the rear stroke screw by up to 20 mm to accommodate varying package sizes on a packaging line.
End-Position Tuning
Fine-tune the retract distance on the fly to align tooling precisely, leveraging the 30 mm cushion length for smooth stops.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX290-20 the Right Cylinder?
Choose this 40 mm bore when you need more power than a 32 mm cylinder (which provides 563 N push at 0.7 MPa) but want a more compact footprint than a 50 mm option (1374 N). The adjustable stroke is ideal for machine commissioning or product changeovers, allowing you to dial in the exact end-stop without swapping the cylinder or adding external stops. To replace this ISO 15552 cylinder, match the 40 mm bore, 290 mm stroke, -20 mm adjustment, PT G1/4 port, and standard mounting.
Because the 290 mm stroke is relatively long, the 16 mm rod and M12x1.25 rod thread will experience amplified side loads if the payload is unsupported. Always guide the load externally to prevent premature seal wear. This SAIJ model supports a mounting subset of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR brackets.
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 SAIJ40BX290-20 FAQ
At an operating pressure of 0.7 MPa, this 40 mm bore cylinder provides 879 N of push force and 738 N of pull force. It can reach a maximum push force of 1130 N at 0.9 MPa.
The rear adjuster acts as a mechanical stop that lets you shorten the 290 mm nominal stroke by up to 20 mm, creating a 270-290 mm travel window. It sets the end position but does not hold the load without live air pressure.
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