Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 275mm 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
- Stroke275 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-30
The AirTAC SAIJ125X275-30 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 245 to 275 mm, allowing you to dial back the nominal 275 mm stroke by up to 30 mm during commissioning. Delivering 6136 N of push force at 0.5 MPa, it handles heavy-duty positioning tasks with ease.
This model uses a robust 32 mm carbon steel rod and an M27x2 thread to manage high side loads, while the extruded aluminum barrel integrates sensor grooves on both sides. The rear adjuster acts purely as a mechanical stop for end-position tuning and does not hold the load without live air pressure. For load-holding requirements, consider the SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 275 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 SAIJ125X275-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×275 | 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 SAIJ125X275-30 Is Used
Machine Changeover
Fine-tune the 245-275 mm travel window during product size transitions to set precise end positions without re-mounting the entire actuator.
Heavy Pressing
Leverage the 6136 N push force at 0.5 MPa for heavy pressing or holding operations, using the rear stop to dial in the exact contact depth.
Assembly Line Indexing
Control large payload movements on automated lines, using the 30 mm adjustment to synchronize multiple cylinders during initial commissioning.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X275-30 the Right Cylinder?
Select this 125 mm bore cylinder when an application demands high thrust (6136 N push at 0.5 MPa) alongside variable end-stop positioning. If your force requirements are lower, stepping down to a 100 mm bore yields 3927 N, whereas a 160 mm bore provides 10053 N for heavier loads. The adjustable stroke is perfect for machine setups requiring fine-tuning without swapping components or adding external stops.
To replace an existing ISO 15552 cylinder, match the 125 mm bore, 275 mm stroke, 30 mm adjustment, PT G1/2 port, and mounting choice from the SAIJ set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Note that FB, CA, CB, and CR mounts are omitted. Since the 275 mm stroke is substantial, ensure external guidance is used to prevent rod deflection and premature seal wear.
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 SAIJ125X275-30 FAQ
At 0.5 MPa, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. The maximum operating speed is 30-500 mm/s.
The rear adjuster allows you to shorten the 275 mm stroke by up to 30 mm, creating a 245-275 mm usable travel window. It functions as a mechanical stop for end-position tuning and does not lock or hold the load without continuous air pressure.
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