Airtac SAIJ125 Adjustable Cylinder SAIJ125AX125-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX125-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 125mm 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
- Stroke125 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX125-20
The AirTAC SAIJ125X125-20 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136 N of push force at 0.5 MPa. It features a SUS420J2 stainless steel rod and PT tapered port threads. By turning the rear screw, you can trim the nominal 125 mm travel back by up to 20 mm, creating a precise 105-125 mm usable window to dial in end positions during commissioning.
This adjustable stopper lets you fine-tune the retract position without swapping the cylinder or adding external stops. The extruded aluminum barrel includes sensor grooves on both sides, and because this unit lacks the -S magnet option, position sensing requires external physical stops rather than CMSE or DMSE switches. The adjuster acts purely as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX125-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX125-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 125 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 SAIJ125AX125-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×125 | 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 SAIJ125AX125-20 Is Used
Machine Changeovers
Dial in the 105-125 mm travel window during product family swaps to set new end positions rapidly without changing cylinder hardware.
Heavy Fixture Positioning
Leverage the 6136 N push force at 0.5 MPa to move heavy jigs into place while using the rear screw to fine-tune the final clamping position.
Variable End-Stop Setup
Replace fixed mechanical stops with the integrated 20 mm adjuster to accommodate minor variations in part dimensions on the fly.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX125-20 the Right Cylinder?
Choose this 125 mm bore when an 80 mm bore (providing 2513 N push at 0.5 MPa) is insufficient for moving heavy fixtures, but a 160 mm bore is too bulky. The adjustable 105-125 mm window is ideal for product-size changeovers on a packaging line, allowing operators to set variable end-stops on the fly instead of machining custom spacers for a fixed-stroke SAI cylinder. For a true ISO 15552 replacement match, confirm the 125 mm bore, 125 mm stroke, PT port threads, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2).
Although the 125 mm stroke is relatively short, the 32 mm rod diameter handles significant side loads. If your application approaches the 30-500 mm/s speed limit for this bore size, ensure external guiding is used to prevent binding. Remember that the rear adjuster is not a locking device; for load-holding without live air, consider an SAIL or BSAI cylinder.
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 SAIJ125AX125-20 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 allows you to shorten the 125 mm nominal stroke by up to 20 mm, providing an effective travel range of 105-125 mm. This stopper only sets the end position and does not lock the load without continuous air pressure.
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