Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-40
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 155mm 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
- Stroke155 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-40
The AirTAC SAIJ40X155-40 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 115 to 155 mm, allowing you to dial in the exact retract position without swapping out the barrel or adding external stops. It delivers a robust 879 N of push force at 0.7 MPa, making it highly suitable for moderate-load positioning tasks.
This unit features a SUS304 stainless steel rod for superior corrosion resistance and uses PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting. Keep in mind the rear adjuster acts purely as a travel stop to fine-tune the end position; it does not lock or hold the load without continuous live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-40 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 155 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 SAIJ40BX155-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×155 | 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 SAIJ40BX155-40 Is Used
Machine Changeover
Quickly recalibrate the retract distance on packaging lines when switching between different carton sizes, using the 40 mm adjustment window to avoid mechanical rebuilds.
End-Stop Calibration
Fine-tune the final end position during machine commissioning to achieve exact sensor triggering and precise mechanical placement without shimming.
Variable Product Diverter
Adjust the stroke length on the fly to accommodate varying package widths on a conveyor system, ensuring accurate sorting and spacing.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-40 the Right Cylinder?
Choose this 40 mm bore when your application requires precise end-position tuning during commissioning or frequent product changeovers. If you need less force, stepping down to a 32 mm bore yields 563 N at 0.7 MPa, while stepping up to a 50 mm bore provides 1374 N. The adjustable 115-155 mm window is perfect for dialing in variable end stops on the fly, whereas a fixed SAI cylinder locks you into a single 155 mm stroke.
To replace an existing cylinder, verify the 40 mm bore, 155 mm nominal stroke, 40 mm adjustment range, PT port threads, and standard mounting interface. SAIJ supports a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. Because it lacks a magnet, it does not support CMSE or DMSE sensors. For any load-holding requirements without live 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 SAIJ40BX155-40 FAQ
The rear adjuster allows you to shorten the effective stroke by up to 40 mm, creating a usable travel window between 115 mm and 155 mm. It acts as a mechanical stop and does 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 528 N of pull force. It can deliver up to 1130 N of push force at 0.9 MPa.
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