Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-20S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-20S 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 SAIJ40BX155-20S
The AirTAC SAIJ40X155-20-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 135 to 155 mm. It delivers 879 N of push force and 528 N of pull force at 0.7 MPa, fitting mid-range automation tasks perfectly. The integrated -S magnet enables direct mounting of CMSE reed and DMSE electronic sensors along the dual side grooves of the extruded aluminum barrel.
This specific SKU utilizes a SUS304 stainless steel rod (code B) for superior corrosion resistance and features PT tapered port threads. The rear stopper mechanism allows precise end-position tuning during commissioning without adding external stops. Note that this adjuster acts strictly as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-20S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-20S |
|---|---|
| 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 SAIJ40BX155-20S
| 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 SAIJ40BX155-20S Is Used
Machine Changeover
Quickly reconfigure the 135-155 mm stroke end-stop during product size changeovers on a packaging line without swapping the entire actuator.
Position Calibration
Fine-tune the retract end-position during initial machine commissioning to achieve precise mechanical alignment against hard stops.
Variable End Stops
Adjust the effective travel on the fly for diverter gates that need to accommodate varying package lengths on a conveyor system.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-20S the Right Cylinder?
Select this 40 mm bore when an application requires finer end-position control than a fixed SAI cylinder offers, allowing you to dial in the exact 135-155 mm stroke on the fly. If your process demands greater thrust, stepping up to the 50 mm bore yields 1374 N at 0.7 MPa; conversely, dropping to a 32 mm bore reduces it to 563 N. Because the stroke is under 300 mm, side-load risks are moderate, but the 16 mm rod still requires external guiding for heavy lateral loads. For load-holding without continuous air, pair this cylinder with an external rod lock or explore the SAIL lock series.
To guarantee a direct ISO 15552 replacement, match the 40 mm bore, 155 mm nominal stroke, 20 mm adjustment range, PT G1/4 port, and -S magnet requirement. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately 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 SAIJ40BX155-20S FAQ
At 0.7 MPa operating pressure, 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 allows you to shorten the 155 mm nominal stroke by up to 20 mm, creating a usable travel window of 135 to 155 mm. This stopper only sets the travel end and does not lock the load without live air pressure.
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