Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 250mm 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
- Stroke250 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-20
The AirTAC SAIJ125X250-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the effective travel by up to 20 mm. This creates a precise 230-250 mm usable stroke window, enabling fine end-position tuning at commissioning without swapping out the cylinder or adding external stops. It delivers a robust 6136 N push force at 0.5 MPa, making it suitable for heavy-duty positioning tasks.
This model uses a carbon steel piston rod with an M27x2 thread, paired with a PT tapered G1/2 port to handle high flow requirements. The extruded aluminum barrel incorporates sensor grooves on both sides for flexible switch mounting. While the rear screw acts as a travel stop to set the end position, it does not hold the load without live air pressure; for positive load-holding, consider the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 250 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 SAIJ125X250-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×250 | 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 SAIJ125X250-20 Is Used
Machine Setup Changeover
Dial in the 230-250 mm retract window during product size changes without machining new hard stops or replacing the actuator.
Heavy Press Positioning
Leverage 6136 N of thrust at 0.5 MPa to move heavy tooling, using the rear screw to fine-tune the exact clamping distance.
Variable End-Stop Assembly
Adjust the effective stroke on the fly for assembly lines handling multiple part lengths within the same workstation.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-20 the Right Cylinder?
Selecting this 125 mm bore cylinder makes sense when your application requires substantial force—such as the 6136 N generated at 0.5 MPa—but still needs variable end-stop flexibility for product changeovers. If your setup demands less force, stepping down to an 80 mm bore yields 2513 N, whereas moving up to a 160 mm bore provides 10053 N. The adjustable stroke is ideal for dialing in exact retract distances during machine setup, whereas a fixed-stroke SAI cylinder is better for rigid, unchanging endpoints.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 250 mm stroke, 20 mm adjustment range, PT G1/2 port, and your required mounting style. SAIJ supports a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. Since this unit lacks a magnet, position sensing requires adding an -S suffix to the model to use AirTAC CMSE reed or DMSE electronic sensors.
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 SAIJ125X250-20 FAQ
The rear adjuster acts as a mechanical stop that lets you shorten the 250 mm nominal stroke by up to 20 mm, providing a usable travel window of 230-250 mm. It sets the end position but does not lock the load without continuous air pressure.
At 0.5 MPa operating pressure, it generates 6136 N of push force and 5734 N of pull force. It can reach a maximum push force of 11045 N at 0.9 MPa.
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