Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-40 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 SAIJ125X290-40
The AirTAC SAIJ125X290-40 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a nominal 290 mm stroke that can be dialed back by up to 40 mm, yielding a usable travel window of 250 to 290 mm for precise end-position tuning. Built with a carbon steel piston rod and PT tapered ports, it delivers a robust 6136 N pull force at 0.5 MPa, scaling to 11045 N at 0.9 MPa.
This adjustable model allows you to fine-tune the retract end-position at commissioning or during product changeovers without swapping the cylinder or adding external stops. The rear adjuster functions strictly as a travel stop to set the end-point and relies on the integrated variable air cushions for deceleration; it does not hold the load without live air pressure. For load-holding requirements without continuous air, consider the SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-40 |
|---|---|
| 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 SAIJ125X290-40
| 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 SAIJ125X290-40 Is Used
Format Changeovers
Dial in the 250-290 mm travel window during product size transitions on packaging lines without disassembling the actuator.
Heavy Pressing
Leverage the 11045 N push force at 0.9 MPa for heavy-duty joining or forming tasks that require precise end-of-stroke positioning.
Commissioning Calibration
Fine-tune the retract end-position during initial machine setup to dial out mechanical tolerances and achieve exact stopping points.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-40 the Right Cylinder?
Choose this 125 mm bore when an application demands high thrust—stepping down to a 100 mm bore drops the 0.5 MPa pull force to 3681 N, whereas this SAIJ125X290-40 provides 6136 N. The adjustable 250-290 mm travel window is ideal for machinery requiring variable end-stops during format changes, offering greater setup flexibility than a fixed-stroke SAI cylinder. Because the stroke is 290 mm, the 32 mm diameter carbon steel rod and M27x2 thread provide a rigid interface, but an external guide rail is still recommended to manage side loads on the extended rod.
When specifying a replacement, verify the 125 mm bore, 290 mm stroke, 40 mm adjustment range, PT port threads, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2—omitting FB, CA, CB, and CR). As this unit lacks the -S magnet option, position sensing requires external proximity switches rather than the 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 SAIJ125X290-40 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of pull force and 6136 N of push force. At 0.9 MPa, the push force increases to 11045 N.
The rear adjuster acts as a mechanical stop that shortens the effective stroke by up to 40 mm, creating a usable travel window of 250 to 290 mm. It sets the end-position and deceleration point, but it is not a lock and will not hold the load without live air pressure.
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