Airtac SAIJ125 Adjustable Cylinder SAIJ125AX800-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX800-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 800mm 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
- Stroke800 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX800-50
The AirTAC SAIJ125X800-50 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the effective travel down from an 800 mm nominal stroke to a 750 mm minimum. This creates a precise 750-800 mm usable window, letting you dial in the retract end-position at commissioning without swapping out the cylinder or adding external stops. It delivers substantial thrust, generating 8590 N of push force and 5734 N of pull force at a 0.7 MPa operating pressure.
This variant uses a SUS420J2 stainless steel rod (option A) for improved corrosion resistance compared to standard carbon steel. Fluid supply connects via PT tapered G1/2 ports, and the extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting. The rear adjuster acts purely as a mechanical stop to set the travel end; it does not lock or hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX800-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX800-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 800 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 SAIJ125AX800-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×800 | 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 SAIJ125AX800-50 Is Used
Product Changeovers
Dial in the 750-800 mm travel window during line size transitions without physically replacing the cylinder or bolting on external stopper blocks.
Commissioning Fine-Tuning
Use the rear adjuster to precisely set the retract end-position during initial machine setup, absorbing mechanical tolerance variations across the stroke.
Long-Stroke Positioning
Move heavy fixtures over an 800 mm travel distance while relying on the M27x2 thread and 32 mm rod to handle substantial dynamics when properly guided.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX800-50 the Right Cylinder?
Choose this 125 mm bore when 100 mm is insufficient, as the 100 mm bore yields 5497 N of push force at 0.5 MPa compared to the 6136 N provided by this 125 mm unit at the same pressure. The adjustable stroke is selected over a fixed-stroke SAI cylinder when a machine requires variable end-stops to accommodate product-size changeovers. Because the nominal stroke is 800 mm, the 32 mm diameter rod and M27x2 rod thread must carry significant side-load; an external guide rail is recommended to prevent rod bending and premature seal wear.
To match this ISO 15552 interchangeable cylinder for a replacement, verify the 125 mm bore, 800 mm stroke, 50 mm adjustment range, PT G1/2 port, and the required mounting set (Basic, FA, LB, TC, FTC, TCM1, or TCM2). This unit has no -S magnet, so it cannot use CMSE or DMSE sensors without a rod magnet upgrade. If your application requires the load to be held without live air pressure, this adjuster will not act as a brake; consider an external pilot-operated check valve or a SAIL/BSAI locking cylinder 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 SAIJ125AX800-50 FAQ
At an operating pressure of 0.7 MPa, this 125 mm bore cylinder generates 8590 N of push force and 5734 N of pull force. At the maximum 1.0 MPa pressure, the push force reaches 11045 N.
The rear mechanical stopper allows you to shorten the 800 mm nominal stroke by up to 50 mm, providing a usable travel window of 750-800 mm. The adjuster sets the travel end but does not lock the load without continuous air pressure.
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