Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-50 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 SAIJ125X325-50
The AirTAC SAIJ125X325-50 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that provides a usable travel window of 275-325 mm. Delivering 6136 N of pull force at 0.5 MPa, it handles heavy positioning tasks. The carbon steel rod and M27x2 thread provide robust anchoring for heavy loads.
This extruded aluminum barrel includes sensor grooves on both sides for CMSE reed and DMSE electronic switches. It uses PT tapered G1/2 ports and reaches speeds of 30-500 mm/s. The rear adjuster acts strictly as a mechanical stop for end-position tuning, not a lock, meaning live air pressure is required to hold the load.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-50 |
|---|---|
| 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 SAIJ125X325-50
| 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 SAIJ125X325-50 Is Used
Heavy Press Fit
Dialing in the 275-325 mm travel window lets operators fine-tune press depths for different bearing sizes without changing the cylinder setup.
Product Diversion
Adjusts the retract end position on the fly to accommodate varying package lengths on a single line, ensuring accurate stops.
Machine Changeover
Speeds up product-size changeovers by allowing the rear stopper to trim the stroke by up to 50 mm instead of physically swapping the actuator.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-50 the Right Cylinder?
Choose this 125 mm bore when 100 mm (3927 N push at 0.5 MPa) lacks the force for heavy assembly, but 160 mm (10053 N) is oversized. The 50 mm adjustment range allows precise end-stop tuning during machine commissioning without swapping cylinders. For load-holding without live air, use an external rod lock or pilot-operated check valve, as the adjuster here only sets travel limits.
When replacing an ISO 15552 cylinder, match the 325 mm stroke, 50 mm adjustment, PT G1/2 port, and your required mounting from the SAIJ set: Basic, FA, LB, TC, FTC, TCM1, TCM2. Because the 325 mm stroke is long, the 32 mm rod diameter still requires an external guide to prevent side-load damage.
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 SAIJ125X325-50 FAQ
It provides 6136 N of push force and 5734 N of pull force at 0.5 MPa, scaling up to 11045 N push at 0.7 MPa.
The rear adjuster mechanically limits the piston travel, creating a 275-325 mm usable window. It acts as a stop to tune end positions and does not hold the load without live air.
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Covers non-human-caused product damage.
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Standard models usually ship in 3-4 days.
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