Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-75 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 SAIJ125AX275-75
The AirTAC SAIJ125X275-75 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the 275 mm nominal stroke by up to 75 mm. This creates a usable travel window of 200-275 mm, allowing precise end-position tuning at commissioning without swapping out the physical actuator. It delivers 6136 N of push force and 5734 N of pull force at 0.5 MPa.
This variant features a SUS420J2 stainless steel rod (material code A) for improved corrosion resistance and ships with PT tapered port threads (G1/2). The extruded aluminum barrel includes sensor grooves on both sides, though this specific SKU omits the magnet, meaning CMSE or DMSE electronic sensors cannot be used without modification. The rear screw acts purely as a travel stop for deceleration and is not a locking mechanism.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-75 |
|---|---|
| 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 SAIJ125AX275-75
| 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 SAIJ125AX275-75 Is Used
Product Size Changeovers
Quickly modify the effective stroke from 200 to 275 mm during production line changeovers to accommodate varying package dimensions without changing cylinders.
Commissioning Fine-Tuning
Dial in the exact end-of-stroke position during machine setup to prevent mechanical crashes, using the rear adjuster rather than machining custom external stoppers.
Variable End Stops
Provide adjustable physical endpoints for multi-stage assembly processes where the actuator must push components to differing depths on the same fixture.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-75 the Right Cylinder?
Choose this 125 mm bore when an 80 mm cylinder (providing 2513 N push at 0.5 MPa) lacks the thrust for heavier fixtures, but a 160 mm bore (10053 N) would be excessive. The 75 mm adjustment range is ideal for production lines running mixed product sizes, enabling rapid changeovers by simply turning the rear stopper rather than adding external spacers. Because the nominal stroke is 275 mm, an external guide should be used to support the load and prevent excessive side-loading on the M27x2 rod thread.
For a direct ISO 15552 replacement match, confirm the 125 mm bore, 275 mm stroke, 75 mm adjustment, PT G1/2 port, and the absence of a magnet. Note that the SAIJ mounting set is limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR styles found on some standard cylinders. If your application requires the load to be held without live air pressure, this cylinder will not suffice; you must specify an external rod lock or choose a SAIL or BSAI model instead.
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 SAIJ125AX275-75 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 the maximum 1.0 MPa pressure, it achieves a push force of 11045 N.
The rear adjuster screw allows you to shorten the 275 mm nominal stroke by up to 75 mm, creating a usable travel window of 200-275 mm. This stopper only sets the travel end and does not lock or hold the load without continuous air pressure.
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