Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 135mm 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
- Stroke135 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-50
The AirTAC SAIJ125X135-50 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the nominal 135 mm travel by up to 50 mm. This creates an 85-135 mm usable window, letting you fine-tune the retract end position during commissioning or product changeovers without physically swapping the actuator or adding external stops. In the 125 mm bore class, it delivers 6136 N of pull force at 0.5 MPa and up to 11045 N at 0.9 MPa.
The carbon steel piston rod features an M27x2 thread, while pneumatic connections use a PT tapered G1/2 port. The extruded aluminum barrel includes sensor grooves on both sides for mounting position switches. It is crucial to note that the rear adjuster acts purely as a travel stop to set the end position; it does not hold the load. For dead-load holding without live air pressure, you must use a related SAIL pneumatic lock or an external rod lock.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 135 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 SAIJ125X135-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×135 | 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 SAIJ125X135-50 Is Used
Variable End-Position Tuning
Dial in the exact retract distance between 85 and 135 mm during machine setup to accommodate new material thicknesses without disassembling the pneumatic circuit.
Product Size Changeovers
Quickly adjust the stroke stop on packaging conveyors when switching between different carton lengths, ensuring precise mechanical positioning.
Heavy Assembly Clamping
Leverage the 11045 N push force at 0.9 MPa to secure heavy components during assembly, using the rear screw to fine-tune the clamping depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-50 the Right Cylinder?
Select this 125 mm bore actuator when your machine requires high force (6136 N pull at 0.5 MPa) alongside a highly variable retract stroke. If your application needs less thrust, stepping down to a 100 mm bore yields 3681 N pull, whereas moving up to a 160 mm bore provides 9425 N pull. The adjustable stroke is ideal for packaging lines or assembly stations that process multiple product sizes, allowing the end-stop to be modified on the fly instead of re-piping a fixed-stroke SAI cylinder.
When replacing an existing ISO 15552 cylinder, match the 125 mm bore, 135 mm nominal stroke, 50 mm adjustment range, PT G1/2 port, and the required mounting accessory. SAIJ supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts, omitting FB, CA, CB, and CR options. Because this is a non-magnetic standard rod variant, it does not support CMSE or DMSE sensors without a rod upgrade.
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 SAIJ125X135-50 FAQ
It features a rear adjusting screw that acts as a mechanical stop, allowing you to shorten the effective stroke by up to 50 mm. This provides an 85-135 mm usable travel window for fine-tuning the end position at commissioning.
At 0.5 MPa it provides 6136 N pull force and 8590 N push force. At 0.9 MPa, the push force increases to 11045 N.
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