Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 450mm 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
- Stroke450 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-50
The AirTAC SAIJ125X450-50 is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear stroke adjuster. It delivers a robust 6136N pull force at 0.5 MPa and provides a usable travel window of 400-450 mm, allowing you to trim the nominal 450 mm stroke by up to 50 mm during machine setup. The extruded aluminum barrel includes sensor grooves on both sides for flexible positioning of CMSE reed or DMSE electronic sensors.
This adjustable design eliminates the need to swap cylinders or bolt on external stops when fine-tuning end positions. The 32 mm carbon steel rod and M27x2 thread provide high rigidity for heavy loads, while the PT tapered port ensures a tight pneumatic seal. The rear adjuster acts purely as a mechanical stop to set the travel end and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 450 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 SAIJ125X450-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×450 | 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 SAIJ125X450-50 Is Used
Product Changeovers
Dial in the 400-450 mm travel window during line changeovers to accommodate different product lengths without swapping out the cylinder.
End-Position Tuning
Use the rear stopper to fine-tune the retract end position at commissioning, absorbing mechanical tolerance variations without adding external stops.
Heavy Forming Stops
Leverage the 6136N pull force for heavy-duty pressing or forming tasks where the exact end-of-stroke contact point must be adjustable on the fly.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-50 the Right Cylinder?
Select this 125 mm bore model when an application requires substantial thrust (6136N pull at 0.5 MPa) and precise variable end-stops. If your force requirements are lower, stepping down to a 100 mm bore yields 3681N pull force, whereas stepping up to a 160 mm bore provides 9425N. The SAIJ configuration is chosen over a fixed-stroke SAI cylinder when product changeovers require rapid, screw-based fine-tuning of the retract position without replacing hardware.
For ISO 15552 interchangeability, match the 125 mm bore, 450 mm nominal stroke, 50 mm adjustment range, PT port thread, and your required mounting accessory from the SAIJ subset (Basic, FA, LB, TC, FTC, TCM1, TCM2). Note that FB, CA, CB, and CR mounts are omitted from this series. Because the 450 mm stroke is long, an external guide is recommended to prevent excessive side loads on the rod. For applications needing true load-holding without live air, consider the SAIL or BSAI series instead of relying on the adjuster.
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 SAIJ125X450-50 FAQ
The rear adjuster allows you to shorten the effective stroke by up to 50 mm, creating a 400-450 mm usable travel window. It acts as a mechanical stop to set the retract end position and does not lock or hold the load without continuous air pressure.
At 0.5 MPa it provides 6136N pull force and 8590N push force. At the maximum operating pressure of 1.0 MPa, it can deliver up to 1251 kgf.
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