Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 300mm 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
- Stroke300 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-30
The AirTAC SAIJ125X300-30 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that permits up to 30mm of travel reduction. This yields a usable stroke window of 270-300mm, enabling precise end-position tuning at commissioning without swapping the unit or adding external stops. It delivers a robust 8590N push force at 0.7MPa and operates at speeds of 30-500mm/s.
Equipped with a 32mm carbon steel rod and M27x2 rod thread, this bore handles substantial side loads, though the 300mm stroke still necessitates an external guide for optimal support. The extruded aluminum barrel includes sensor grooves on both sides, and the mounting interface supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 brackets. The rear adjuster acts strictly as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 300 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 SAIJ125X300-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×300 | 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 SAIJ125X300-30 Is Used
Machine Changeover
Dial in the 270-300mm travel window during product size transitions without replacing the cylinder or repositioning hard stops.
End-Position Tuning
Fine-tune the retract stroke end exactly during commissioning to accommodate mechanical tolerances or varying material thickness.
Heavy Forming Press
Leverage the 8590N push force at 0.7MPa for robust pressing operations while adjusting the stroke to protect tooling.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-30 the Right Cylinder?
Choose this 125mm bore when you require higher thrust than the 100mm bore (5497N push at 0.7MPa) but less than the 160mm bore (14074N). The adjustable stroke is ideal for machine setups requiring variable end stops during product changeovers, contrasting with a fixed-stroke SAI cylinder. To replace an ISO 15552 cylinder, match the 300mm stroke, 30mm adjustment, PT G1/2 port, and mounting type. Since the 300mm stroke exceeds standard compact lengths, ensure an external guide supports the load.
For load-holding without continuous live air, note that this SAIJ adjuster is not a lock. Consider the SAIL (air-released lock) or BSAI (clamp-lock) series, or integrate an external pilot-operated check valve. This model lacks a magnet, so it requires external sensors for position detection.
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 SAIJ125X300-30 FAQ
At 0.7MPa operating pressure, this 125mm bore cylinder provides 8590N of push force and 5734N of pull force. It can deliver up to 1251 kgf at 1.0MPa.
The rear adjuster acts as a mechanical stop that allows you to shorten the nominal 300mm stroke by up to 30mm, creating a 270-300mm usable travel window. It sets the end position but does not lock the load without air pressure.
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