Airtac SAIJ40 Adjustable Cylinder SAIJ40BX25-10
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX25-10 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 25mm 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
- Stroke25 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX25-10
The AirTAC SAIJ40X25-10 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 628N push force at 0.5 MPa and uses a PT tapered G1/4 port. The integrated adjuster allows you to fine-tune the effective travel down to a 15-25 mm window, perfect for dialing in exact end positions during commissioning.
This unit features a SUS304 stainless steel rod for enhanced corrosion resistance. The extruded aluminum barrel includes sensor grooves on both sides, and the rear adjuster functions strictly as a mechanical stop to set the travel end, not as a lock to hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX25-10 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX25-10 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 25 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 SAIJ40BX25-10
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×25 | 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 SAIJ40BX25-10 Is Used
End-Stop Tuning
Dial in the exact retract position within the 15-25 mm window during machine setup without adding external stops.
Product Changeover
Quickly adjust the stroke end for varying product sizes on a packaging line, reducing downtime between runs.
Short-Stroke Clamping
Use the 628N push force at 0.5 MPa to hold parts securely while fine-tuning the clamping depth.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX25-10 the Right Cylinder?
Choose this 40mm bore when a 32mm bore (offering 402N push at 0.5 MPa) is too weak, but a 50mm bore (982N) is oversized. The 10mm adjustment range is ideal for applications requiring variable end stops or product-size changeovers without swapping the cylinder or adding external stops. For load-holding without live pressure, consider the SAIL or BSAI series, as the SAIJ adjuster is only a travel stop.
When replacing an ISO 15552 cylinder, match the 40mm bore, 25mm stroke, PT port thread, and the Basic, FA, LB, TC, FTC, TCM1, or TCM2 mounting set. Because the 25mm stroke is short, side-loading is minimal, but ensure the SUS304 rod thread (M12x1.25) is properly aligned.
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 SAIJ40BX25-10 FAQ
At 0.5 MPa operating pressure, it provides a push force of 628N and a pull force of 528N. At 0.7 MPa, the push force increases to 879N.
The rear adjuster acts as a mechanical stop that lets you shorten the 25mm nominal stroke by up to 10mm, creating a usable travel window of 15-25mm. It sets the end position but does not lock the load without live air.
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