Airtac SAIJ40 Adjustable Cylinder SAIJ40BX225-75S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX225-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 225mm 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
- Stroke225 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX225-75S
The AirTAC SAIJ40X225-75-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers a 0.7 MPa thrust of 879 N and features a 16 mm carbon steel rod with an M12x1.25 thread. Because this is a -75 variant, the external stopper lets you dial back the 225 mm nominal stroke by up to 75 mm, creating a precise 150-225 mm usable travel window for product changeovers without swapping the barrel.
This unit carries the -S magnet for position sensing with AirTAC CMSE reed and DMSE electronic switches fitted into the dual-side sensor grooves. It is built with a SUS304 stainless steel rod for corrosion resistance and uses PT tapered ports. The rear adjuster acts purely as a travel stop to fine-tune the end position; it does not hold the load without live air, so use a SAIL or BSAI cylinder if true locking is required.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX225-75S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX225-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 225 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 SAIJ40BX225-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×225 | 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 SAIJ40BX225-75S Is Used
Variable End-Stop Tuning
Dial in the exact retract position within the 150-225 mm window during machine commissioning to accommodate new jigs without changing the cylinder.
Product Size Changeover
Rapidly adjust the travel end for different material lengths on a processing line using the 75 mm rear stopper instead of installing a new actuator.
Corrosive Setup Operations
Leverage the SUS304 stainless steel rod and 879 N push force at 0.7 MPa for precise positioning tasks in environments requiring high rust resistance.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX225-75S the Right Cylinder?
Choose this 40 mm bore when a 32 mm bore (providing 563 N at 0.5 MPa) is too weak, but an 80 mm bore (3518 N at 0.7 MPa) is excessive. The 75 mm adjustment range is ideal for machines processing variable product sizes, letting operators fine-tune the retract end-stop at commissioning rather than machining external hard stops. For fixed travel without the external adjuster screw, the standard SAI cylinder is the simpler alternative.
As a dimensionally interchangeable ISO 15552 profile cylinder, it replaces units with a 40 mm bore, 225 mm stroke, PT port thread, and a magnet for sensing. It supports the SAIJ mounting subset (Basic, FA, LB, TC, FTC, TCM1, TCM2) and omits FB, CA, CB, and CR. Since the 225 mm stroke is unsupported, guide external loads to prevent side-load damage to the M12x1.25 rod.
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 SAIJ40BX225-75S FAQ
At 0.7 MPa operating pressure, this 40 mm bore cylinder provides a push force of 879 N and a pull force of 528 N. The maximum push force is 1130 N at 0.9 MPa.
The rear adjuster screw acts as a mechanical stop that lets you shorten the 225 mm nominal stroke by up to 75 mm, providing a usable travel window of 150-225 mm. It only sets the end position and does not lock the load without live air pressure.
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