Airtac SAIJ40 Adjustable Cylinder SAIJ40BX225-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX225-20 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 SAIJ40BX225-20
The AirTAC SAIJ40X225-20 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the nominal 225 mm travel by up to 20 mm. This creates a precise 205-225 mm usable window, enabling exact end-position tuning at commissioning without swapping the cylinder or adding external stops. It delivers 628 N of push force at 0.5 MPa and features a SUS304 stainless steel rod for superior corrosion resistance.
This model utilizes PT tapered ports and includes variable air cushions at both ends to manage deceleration. The rear adjuster acts purely as a travel stop and does not hold the load without live air pressure. For load-holding requirements without continuous air, consider the SAIL or BSAI variants. An optional -S magnet can be added to support AirTAC CMSE (reed) and DMSE (solid-state) sensors in the dual-side barrel grooves.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX225-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX225-20 |
|---|---|
| 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 SAIJ40BX225-20
| 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 SAIJ40BX225-20 Is Used
Machine Setup Tuning
Fine-tune the 205-225 mm travel window during initial commissioning to achieve perfect seating without machining hard stops.
Product Size Changeover
Quickly adjust the retract end-position by up to 20 mm when running different product lengths on the same conveyor line.
Corrosive Assembly Tasks
Leverage the SUS304 stainless steel rod for light push operations (628 N at 0.5 MPa) in environments requiring rust prevention.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX225-20 the Right Cylinder?
Choose this 40 mm bore when you need 628 N push force at 0.5 MPa, stepping up from a 32 mm bore (402 N) if your payload increases, or down from a 50 mm bore (982 N) to save space and air consumption. The adjustable 205-225 mm window is ideal for product changeovers on a line where exact end-stops vary, unlike a fixed-stroke SAI cylinder. Since the stroke is 225 mm, ensure external guiding if the load is heavy or subject to side loads.
To match this ISO 15552 cylinder, specify: 40 mm bore, 225 mm stroke, 20 mm adjustment, PT port thread, SUS304 (B) rod material, and no magnet. Mounting options are limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, CR). The cylinder operates at 30-800 mm/s with a G1/4 port.
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 SAIJ40BX225-20 FAQ
At 0.5 MPa operating pressure, 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 screw lets you shorten the 225 mm nominal stroke by up to 20 mm, providing a usable travel window of 205-225 mm. It functions as a mechanical stop for end-position tuning and is not a locking device.
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