Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 290mm 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
- Stroke290 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-30
The AirTAC SAIJ125X290-30 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the effective travel back by up to 30 mm. This yields a usable stroke window of 260 to 290 mm, enabling precise end-position tuning at commissioning without swapping out the barrel or adding external mechanical stops. It delivers robust performance with a 0.5 MPa pull force of 5734 N and a maximum thrust of 1251 kgf at 1.0 MPa.
This 125 mm bore unit uses a PT tapered G1/2 port and a robust 32 mm carbon steel rod with an M27x2 thread, providing high rigidity against side loads. The extruded aluminum barrel includes sensor grooves on both sides for direct mounting of CMSE reed or DMSE electronic switches if a magnet is added later. Furthermore, the SAIJ mounting interface supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 attachments, deliberately omitting FB, CA, CB, and CR brackets to streamline the adjustable-stop design.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 290 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 SAIJ125X290-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×290 | 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 SAIJ125X290-30 Is Used
Variable End-Stop Machining
Dial in the exact 260-290 mm travel window during machine setup to accommodate varying part lengths without physically replacing the cylinder or adding external stopper blocks.
Product Changeover Diverter
Quickly adjust the rear stroke stopper by up to 30 mm on a packaging line to handle different carton sizes, ensuring precise positioning without extensive downtime.
Heavy Press End-Tuning
Leverage the 125 mm bore's 1251 kgf maximum thrust for heavy pressing operations while fine-tuning the bottom dead center position at commissioning via the rear screw.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-30 the Right Cylinder?
Select this 125 mm bore model when your application requires heavy thrust beyond the 80 mm bore class (which provides 2268 N pull at 0.5 MPa) but not the extreme mass of a 160 mm unit. The adjustable 260-290 mm travel window is ideal for production lines that undergo frequent product-size changeovers, allowing operators to dial in the exact end-stop without re-engineering fixed hard stops. For strokes of 290 mm on a large bore, always use an external guide rail to prevent rod side-loading, as the rear adjuster only sets the travel end and does not support lateral loads.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 290 mm nominal stroke, 30 mm adjustment range, PT G1/2 port, and the appropriate mounting bracket. Note that the rear adjuster acts strictly as a travel stop and relies on the variable air cushions for end-deceleration; it does not lock or hold the load without live air pressure. For true fail-safe load holding, consider the AirTAC SAIL pneumatic lock or BSAI clamp-lock series 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 SAIJ125X290-30 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 its maximum rated pressure of 1.0 MPa, it can deliver up to 1251 kgf of thrust.
The rear external stopper screw allows you to shorten the nominal 290 mm stroke by up to 30 mm, creating a usable travel window of 260 to 290 mm. This adjuster sets the retract end position and works with the air cushions for deceleration, but it does not lock the load without continuous air pressure.
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