Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-50S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 425mm 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
- Stroke425 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-50S
The AirTAC SAIJ40X425-50-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a nominal 425 mm stroke that can be fine-tuned backward by up to 50 mm, yielding a practical usable travel window of 375 to 425 mm. Delivering 879 N of push force at 0.7 MPa, it integrates a SUS304 stainless steel rod for superior corrosion resistance and pairs with a PT tapered port thread.
Because the stroke extends past 300 mm, the 16 mm rod diameter should be paired with an external guide to manage side loads and prevent premature wear. The extruded aluminum barrel features sensor grooves on both sides, and the included magnet (-S) enables precise end-position detection using AirTAC CMSE reed or DMSE electronic solid-state switches.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-50S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 425 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 SAIJ40BX425-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×425 | 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 SAIJ40BX425-50S Is Used
Changeover Calibration
Dial in the 375-425 mm travel window during product size changeovers without physically replacing the cylinder or bolting on external stoppers.
Variable End-Stop Positioning
Fine-tune the retraction end-point at commissioning to perfectly match varying package lengths on a packaging line.
Corrosive Environment Actuation
Leverage the SUS304 stainless steel rod for push operations up to 879 N in environments where standard carbon steel rods would degrade.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX425-50S the Right Cylinder?
Select this 40 mm bore when an application requires moderate force—stepping down to a 32 mm bore yields only 563 N at 0.7 MPa, while stepping up to a 50 mm bore provides 1374 N. The adjustable stroke is ideal for machine setup and product changeovers, allowing you to dial in the exact end-stop without swapping hardware or adding external stops. The rear adjuster acts purely as a travel stop and does not hold the load without live air; for true load-holding without pneumatic pressure, consider an AirTAC SAIL or BSAI cylinder.
To match this exact ISO 15552 interchangeable replacement, specify: 40 mm bore, 425 mm nominal stroke, 50 mm adjustment range, PT port thread, SUS304 (B) rod material, and the -S magnet option. Mounting choices are limited to the SAIJ subset: 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 SAIJ40BX425-50S FAQ
At a 0.7 MPa operating pressure, this 40 mm bore cylinder provides 879 N of push force and 740 N of pull force. The maximum thrust at 1.0 MPa is 128 kgf.
The rear adjuster screw allows you to shorten the effective stroke by up to 50 mm from the 425 mm nominal length, creating a 375-425 mm travel window. It functions as a mechanical stop and does not lock the load without continuous air pressure.
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