Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-40S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-40S 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 SAIJ40BX155-40S
The AirTAC SAIJ40X155-40-S 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 back the nominal 155 mm stroke by up to 40 mm during commissioning. This bore size delivers 879 N of push force at 0.7 MPa, fitting neatly into medium-duty applications. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting.
This specific configuration features a SUS304 stainless steel rod for superior corrosion resistance and a PT tapered port thread. Equipped with a magnet, it supports AirTAC CMSE reed and DMSE electronic sensors for precise end-of-stroke detection. The rear adjuster acts purely as a travel stop to fine-tune the end position without adding external stops, but it does not lock the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-40S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-40S |
|---|---|
| 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 SAIJ40BX155-40S
| 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 SAIJ40BX155-40S Is Used
Machine Setup Calibration
Dial in the exact 115 to 155 mm end-position during commissioning without swapping cylinders or adding external mechanical stops.
Product Size Changeover
Quickly adjust the retract stroke by up to 40 mm to accommodate varying product lengths on a single production line.
Sensing End Positions
Leverage the internal magnet with CMSE and DMSE sensors to confirm travel limits within the adjusted stroke window.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-40S the Right Cylinder?
Choose this 40 mm bore when your application requires around 879 N of push force at 0.7 MPa. If you need less force, stepping down to a 32 mm bore yields 563 N, while stepping up to a 50 mm bore provides 1374 N. An adjustable stroke is selected over a fixed SAI cylinder when you need a variable end-stop for product changeovers or fine-tuning at machine setup.
For ISO 15552 replacement, match the 40 mm bore, 155 mm stroke, 40 mm adjustment, PT port, and the -S magnet requirement. Note that the SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR brackets. If your machine requires true load-holding without continuous air pressure, consider the SAIL or BSAI series instead of relying on this 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 SAIJ40BX155-40S FAQ
At 0.7 MPa, this 40 mm bore cylinder provides 879 N of push force and 528 N of pull force. It can reach a maximum push force of 1130 N at 0.9 MPa.
The rear adjuster screw acts as a mechanical stop, letting you shorten the 155 mm nominal stroke by up to 40 mm. This creates a usable travel window of 115 to 155 mm for fine-tuning end positions.
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