Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-75
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-75 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 SAIJ40BX155-75
The AirTAC SAIJ40X155-75 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a nominal 155 mm stroke that can be dialed back by up to 75 mm, yielding a usable travel window of 80 to 155 mm. Delivering 628 N of push force at 0.5 MPa, it is built with a SUS304 stainless steel rod for superior corrosion resistance and operates at speeds between 30 and 800 mm/s.
This adjustable model allows you to fine-tune the retract end position during commissioning without swapping hardware or adding external stops. It features PT tapered port threads (G1/4), variable air cushions at both ends to decelerate the load, and sensor grooves on both sides of the extruded aluminum barrel. Note that the rear adjuster acts strictly as a travel stop, not a lock, so it will not hold a load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-75 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-75 |
|---|---|
| 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 SAIJ40BX155-75
| 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 SAIJ40BX155-75 Is Used
Machine Changeover
Dial in the 80 to 155 mm travel window during product size changes without physically replacing the cylinder or repositioning hard stops.
End-Position Tuning
Fine-tune the retract stroke precisely at commissioning to perfect seating or clamping depth using the rear adjustment screw.
Variable Diverter Stroke
Adjust the actuation length on the fly for a conveyor sorting arm handling different package sizes on the same line.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-75 the Right Cylinder?
Choose this 40 mm bore cylinder when an application demands a highly flexible end-stop within an 80 to 155 mm travel window. If you need less adjustment range or a fixed 155 mm stroke, the standard AirTAC SAI cylinder is a simpler choice. If your force requirements are lower, stepping down to a 32 mm bore yields 402 N of push force at 0.5 MPa; stepping up to a 50 mm bore provides 982 N.
To match this exact configuration for an ISO 15552 replacement, specify a 40 mm bore, 155 mm stroke, 75 mm adjustment, PT port threads, and the SUS304 (B) rod material. Because this unit lacks a magnet, it cannot host CMSE or DMSE sensors unless you select the -S option. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. For any load-holding requirements without live air, consider an external rod lock or the AirTAC SAIL 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 SAIJ40BX155-75 FAQ
At 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 acts as a mechanical stop that trims the effective stroke. For this 155 mm nominal stroke cylinder, you can reduce the travel by up to 75 mm, creating a usable window of 80 to 155 mm.
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