Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 325mm stroke, G1/2 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ125 mm
- Stroke325 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-40
The AirTAC SAIJ125X325-40 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the 325 mm nominal travel by up to 40 mm. This creates a precise 285-325 mm usable end-position window, ideal for fine-tuning retract distances during product changeovers without swapping hardware. It delivers robust thrust, generating 6136 N of pull force at 0.5 MPa and reaching 8590 N at 0.7 MPa.
This unit features a SUS420J2 stainless steel rod (option A) for enhanced corrosion resistance and uses PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting. Because the stroke is 325 mm, the 32 mm rod diameter and M27x2 rod thread provide substantial rigidity, though an external guide is still recommended to manage side loads on longer travels.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 325 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2 |
| 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 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max stroke | Up to 1500 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 (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | 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 SAIJ125 Adjustable Cylinder SAIJ125AX325-40 Is Used
Product Size Changeovers
Quickly reconfigure the 285-325 mm retract window on packaging lines when switching between different carton or pallet dimensions.
Machine Setup Calibration
Fine-tune the end-of-stroke position during commissioning without machining new external stopper blocks or changing the cylinder.
Heavy Payload Handling
Leverage the 6136 N pull force at 0.5 MPa to move heavy materials while dialing in the exact stopping point for delicate placement.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-40 the Right Cylinder?
Choose this 125 mm bore when a 100 mm cylinder (providing 3681 N pull at 0.5 MPa) lacks the force for heavier payloads, but a 160 mm bore is physically too large. The adjustable stroke is selected over a fixed SAI cylinder when a machine requires variable retract end-stops for different product sizes. The rear screw acts purely as a travel stop for deceleration alongside the standard air cushions; it does not hold the load without live air. For dead-end positioning under pressure loss, consider an external rod lock or the SAIL lock variant.
To match this exact ISO 15552 replacement, specify: 125 mm bore, 325 mm stroke, 40 mm adjustment range, PT ports, and no magnet. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR rear configurations. Operating speed for this bore size is 30-500 mm/s.
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 SAIJ125 Adjustable Cylinder SAIJ125AX325-40 FAQ
The rear adjuster screw allows you to shorten the effective stroke by up to 40 mm. This provides a usable travel window of 285 to 325 mm, letting you set the exact retract end-position during setup or product changeovers.
At 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of pull force and 5734 N of push force. At 0.7 MPa, the push force increases to 8590 N.
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