Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-40S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 185mm 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
- Stroke185 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-40S
The AirTAC SAIJ40X185-40-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 628N of push force at 0.5 MPa and features a 16mm piston rod with an M12x1.25 thread. By turning the rear stopper screw, you can trim the effective travel back by up to 40mm, creating a precise 145-185mm usable stroke window for exact end-position tuning.
This variant features a SUS304 stainless steel rod (code B) for superior corrosion resistance and includes a built-in magnet (-S) for position sensing. It is fully dimensionally interchangeable per ISO 15552 and utilizes a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2. The extruded aluminum barrel includes sensor grooves on both sides, ready to accept AirTAC CMSE reed or DMSE electronic solid-state switches.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-40S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 185 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 SAIJ40BX185-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×185 | 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 SAIJ40BX185-40S Is Used
Machine Changeover
Dial in the 145-185mm travel window during product size changes without swapping the cylinder or adding external physical stops.
End-Position Tuning
Fine-tune the retract stroke on automated assembly tooling to achieve exact clamping distances at initial commissioning.
Variable End Stops
Accommodate varying package sizes on a conveyor sorting line by adjusting the stroke back by up to 40mm on the fly.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-40S the Right Cylinder?
Select this 40mm bore when an application requires fine-tuning the retract end-position during commissioning or product changeover, rather than relying on a fixed-stroke SAI cylinder. If your setup needs less force, stepping down to a 32mm bore yields 402N at 0.5MPa; stepping up to a 50mm bore provides 982N. To guarantee an exact ISO 15552 replacement match, verify the 185mm stroke, 40mm adjustment range, PT tapered port threads, and the required -S magnet.
Remember that the rear adjuster functions strictly as a travel stop to set deceleration, not as a locking device; it cannot hold a load without live air pressure. For load-holding requirements without continuous air, consider an AirTAC SAIL or BSAI cylinder. Furthermore, while the 16mm rod handles standard side loads well, any stroke over 300mm necessitates an external guide to prevent rod binding.
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 SAIJ40BX185-40S FAQ
At 0.5 MPa operating pressure, this 40mm bore cylinder provides 628N of push force and 528N of pull force. At 0.7 MPa, the push force increases to 879N.
The rear adjuster acts as a stopper screw that lets you shorten the 185mm nominal stroke by up to 40mm, resulting in a usable travel window of 145-185mm. It only sets the travel end and does not lock the load without live air.
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