Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-100
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-100 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 SAIJ40BX325-100
The AirTAC SAIJ40X325-100 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a nominal 325 mm stroke that can be fine-tuned down by up to 100 mm, creating a usable travel window of 225-325 mm. In the 40 mm bore class, it delivers 628 N of push force and 528 N of pull force at 0.5 MPa, operating efficiently between 30-800 mm/s.
This unit is configured with a SUS304 stainless steel rod for superior corrosion resistance and includes PT tapered ports. The rear adjustment screw acts purely as a mechanical stop to set the retract end position during commissioning; it is not a locking device and will not hold a load without live air pressure. For load-holding requirements, consider the SAIL or BSAI series instead.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-100 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-100 |
|---|---|
| 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 SAIJ40BX325-100
| 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 SAIJ40BX325-100 Is Used
Variable End-Stop Positioning
Dial in the exact retract distance between 225 and 325 mm during machine setup to accommodate varying material lengths without adding external physical stops.
Product Size Changeover
Quickly reconfigure the stroke window on packaging lines when switching between different product sizes, minimizing downtime and avoiding cylinder replacement.
Corrosion-Resistant Actuation
Leverage the SUS304 stainless steel rod in light manufacturing environments where moisture or minor chemicals are present, ensuring reliable push force.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-100 the Right Cylinder?
Choose this 40 mm bore cylinder when you need 628 N of thrust at 0.5 MPa and require frequent end-position tuning without swapping components. If your application demands less force, stepping down to a 32 mm bore yields 402 N; if you need significantly more power, a 50 mm bore provides 982 N. The adjustable 225-325 mm window is ideal for product size changeovers, whereas a fixed-stroke SAI cylinder is better suited for dedicated, single-purpose machinery.
Because the 325 mm stroke is relatively long, the 16 mm diameter rod and M12x1.25 rod thread can still experience leverage forces, so an external guide rail is recommended to prevent side-loading damage. To match this ISO 15552 interchangeable cylinder exactly, specify: 40 mm bore, 325 mm stroke, 100 mm adjustment, PT ports, SUS304 (B) rod material, and no magnet. The available mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ40BX325-100 FAQ
At a 0.5 MPa operating pressure, this 40 mm bore cylinder generates 628 N of push force and 528 N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 128 kgf.
The rear adjuster screw allows you to mechanically shorten the 325 mm nominal stroke by up to 100 mm, providing an effective travel range of 225-325 mm. The adjuster functions only as a travel stop and does not lock the load without continuous air pressure.
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