Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-40S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-40S 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 SAIJ40BX325-40S
The AirTAC SAIJ40X325-40-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the effective travel down from 325 mm to a minimum of 285 mm. Delivering 628 N of push force at 0.5 MPa, it provides reliable linear motion using a PT (tapered) G1/4 port and a 16 mm rod. The -S magnet enables position feedback via AirTAC CMSE reed or DMSE solid-state switches fitted into the dual sensor grooves.
Because the nominal 325 mm stroke exceeds typical compact dimensions, the 16 mm rod and M12x1.25 rod thread provide a robust interface, though an external guide is recommended for this longer stroke to manage side loads. The barrel is machined as an extruded aluminum profile rather than a tie-rod assembly, and the rear stopper acts purely as a travel end-tuner, not a load-holding brake.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-40S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-40S |
|---|---|
| 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 SAIJ40BX325-40S
| 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 SAIJ40BX325-40S Is Used
Changeover Tuning
Dial in the 285-325 mm stroke window during product size changeovers on a packaging line without adding external physical stops.
Sensor-Verified Positioning
Lever the -S magnet with DMSE solid-state sensors to confirm end-of-stroke arrival before triggering the next machine sequence.
Corrosion-Resistant Actuation
Deploy the SUS304 stainless steel rod in light manufacturing environments where moisture or washdown could compromise standard carbon steel rods.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-40S the Right Cylinder?
Choose this 40 mm bore when you need 628 N of thrust at 0.5 MPa (or 879 N at 0.7 MPa) and require precise end-position tuning during machine commissioning or product changeover without swapping cylinders. If your application requires less force, the 32 mm bore offers 402 N at 0.5 MPa; if you need more clamping power, the 50 mm bore provides 982 N.
This SAIJ model uses a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) and omits FB, CA, CB, and CR brackets. The SUS304 stainless steel rod (option B) offers superior corrosion resistance. Remember that the rear adjuster only modifies the travel window; it does not lock the load. For dead-stop holding without live air pressure, select a SAIL (air-released lock) or BSAI (clamp-lock) cylinder instead.
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 SAIJ40BX325-40S 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.
The rear adjuster screw lets you shorten the nominal 325 mm stroke by up to 40 mm, creating a usable travel window of 285-325 mm. It acts as an end-position stop and does not lock the load without air pressure.
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