Airtac SAIJ125 Adjustable Cylinder SAIJ125X200-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X200-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 200mm 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
- Stroke200 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X200-20
The AirTAC SAIJ125X200-20 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 180-200 mm usable travel window, allowing you to dial back the 200 mm nominal stroke by up to 20 mm during commissioning. Built with an extruded aluminum barrel, it delivers 6136 N of push force at 0.5 MPa, making it suitable for heavy-duty positioning tasks.
This model uses a 32 mm carbon steel piston rod with an M27x2 thread, paired with a G1/2 port. It supports a speed range of 30-500 mm/s and includes adjustable air cushions at both ends to decelerate the heavy moving load. 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 SAIJ125X200-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X200-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 200 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 SAIJ125X200-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×200 | 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 SAIJ125X200-20 Is Used
Machine Changeover
Quickly fine-tune the 180-200 mm retract position during product size changes on a packaging line without replacing the cylinder.
Heavy-Duty Positioning
Leverages 6136 N of push force at 0.5 MPa to move heavy jigs into exact alignment using the built-in rear stopper.
Variable End Stops
Sets precise mechanical retract limits for automated assembly presses, relying on the adjuster rather than external blocks.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X200-20 the Right Cylinder?
Select this 125 mm bore cylinder when an application requires substantial force, stepping up from the 80 mm bore which provides 2513 N at 0.5 MPa. The adjustable stroke is chosen over a fixed-stroke SAI when you need to fine-tune the retract end position on the fly, such as during a machine setup or product changeover, without physically swapping the cylinder or adding external stopper blocks. For load-holding without continuous air pressure, this standard SAIJ is insufficient; you should instead evaluate the SAIL (air-released lock) or BSAI (clamp-lock) variants.
To ensure a true ISO 15552 replacement match, verify the 125 mm bore, 200 mm stroke, 20 mm adjustment range, PT tapered port thread, and the specific mounting accessory (choosing from Basic, FA, LB, TC, FTC, TCM1, or TCM2). Because the 32 mm rod and M27x2 thread are robust, they handle high side loads well, though any stroke over 300 mm on larger bores would still require an external guide to prevent binding.
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 SAIJ125X200-20 FAQ
It features a rear adjusting screw that lets you shorten the effective stroke by up to 20 mm, creating a 180-200 mm usable travel window. This allows you to fine-tune the end position at commissioning without swapping the cylinder.
At 0.5 MPa, it provides 6136 N of push force and 5734 N of pull force. If you need higher force, it can be operated up to 1.0 MPa, yielding a maximum push force of 1251 kgf.
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