Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 325mm 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
- Stroke325 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-20
The AirTAC SAIJ40X325-20 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 305 to 325 mm, allowing you to dial back the nominal 325 mm stroke by up to 20 mm during commissioning without adding external stops. Delivering 628 N of push force and 528 N of pull force at 0.5 MPa, it fits mid-range automation tasks perfectly.
This variant uses a SUS304 stainless steel piston rod for corrosion resistance and features PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides for CMSE reed or DMSE electronic switches. It supports a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB and CA options.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 325 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 SAIJ40BX325-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×325 | 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 SAIJ40BX325-20 Is Used
Machine Changeover
Fine-tune the 305 to 325 mm retract end-stop when switching product sizes on a packaging line without swapping cylinders.
Assembly Positioning
Dial in the exact end position during initial commissioning to ensure precise placement of mid-range components.
Diverter Adjustment
Set the exact travel limit for a diverter arm handling varied product profiles on a moving conveyor system.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-20 the Right Cylinder?
Choose this 40 mm bore when a 32 mm bore (402 N push at 0.5 MPa) is too weak, but a 50 mm bore (982 N push at 0.5 MPa) is oversized. An adjustable stroke is ideal for machine changeovers where the exact end position needs fine-tuning on the fly, unlike a fixed-stroke SAI cylinder. At 325 mm of travel, the M12x1.25 rod needs an external guide to prevent side-load damage.
The rear adjuster acts only as a travel stop and works with the air cushions to decelerate the load. It does not hold the load without live air pressure. For true load-holding without supply pressure, use a SAIL pneumatic lock or BSAI clamp-lock cylinder. This SAIJ model is dimensionally interchangeable per ISO 15552.
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 SAIJ40BX325-20 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.
A rear screw stopper lets you shorten the effective travel from the 325 mm nominal stroke down to 305 mm, giving a 305 to 325 mm adjustable window for fine end-position tuning.
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