Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-10S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-10S 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 SAIJ125X300-10S
The AirTAC SAIJ125X300-10-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 290 to 300 mm for precise end-position tuning. Built with a 125 mm bore, it delivers 6136 N of push force and 5734 N of pull force at 0.5 MPa. This model includes a magnet for position sensing and uses a PT tapered port thread.
The rear adjusting screw acts as a mechanical stop to fine-tune the retract distance without adding external stops, but it is not a locking device. For load-holding without live air pressure, consider an external rod lock or related types like SAIL or BSAI. The extruded aluminum barrel includes sensor grooves on both sides, and the carbon steel rod features an M27x2 thread for robust load integration.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-10S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-10S |
|---|---|
| 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 SAIJ125X300-10S
| 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 SAIJ125X300-10S Is Used
Precision End-Stop Tuning
Dial in the exact 290-300 mm retract position during machine commissioning to perfect product seating without machining external stopper blocks.
Product Changeover
Quickly adjust the stroke by up to 10 mm on packaging lines when switching to a slightly different carton size, minimizing downtime.
Heavy Forming Setup
Leverage the 6136 N push force at 0.5 MPa for pressing operations, using the fine adjustment to control the final end-of-stroke contact point.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-10S the Right Cylinder?
Choose this 125 mm bore when an 80 mm cylinder lacks thrust; stepping up from 80 mm increases push force at 0.5 MPa from 2513 N to 6136 N. The 10 mm adjustable window is ideal for applications needing slight end-stop calibration during commissioning, avoiding the need to swap a fixed-stroke SAI cylinder. When specifying an ISO 15552 replacement, match the 300 mm stroke, 10 mm adjustment, PT G1/2 port, and the -S magnet requirement.
Because this cylinder features a 300 mm stroke, the M27x2 rod and carbon steel construction handle significant loads, but an external guide is recommended to prevent excessive side-loading on the piston rod over longer travels. This model operates at speeds of 30-500 mm/s and supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts.
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 SAIJ125X300-10S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
The rear adjuster screw lets you shorten the nominal 300 mm stroke by up to 10 mm, creating a 290-300 mm travel window. It functions as a mechanical stop for position tuning and does not lock the load without live air pressure.
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