Airtac SAIJ125 Adjustable Cylinder SAIJ125AX800-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX800-20 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 SAIJ125AX800-20
The AirTAC SAIJ125X800-20 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster that creates a 780-800mm usable travel window. Delivering 6136N of push force at 0.5MPa, it is built with a SUS420J2 stainless steel rod and PT tapered ports for demanding environments.
The rear stopper screw lets you fine-tune the retract end position during commissioning without adding external stops. This extruded aluminum profile cylinder omits FB, CA, CB, and CR mounts, utilizing a reduced ISO 15552 mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX800-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX800-20 |
|---|---|
| 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 SAIJ125AX800-20
| 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 SAIJ125AX800-20 Is Used
Variable End-Stop Tuning
Dial in the 780-800mm retract position precisely during machine setup to accommodate slight variations in workpiece dimensions.
Product Size Changeover
Quickly adjust the stroke end-point on automated lines when switching between different product lengths without changing the cylinder.
Long-Stroke Positioning
Leverage the 6136N thrust for heavy pushing tasks while fine-tuning the final end position to prevent mechanical crashing.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX800-20 the Right Cylinder?
Choose this 125mm bore when a 100mm bore (3927N push at 0.5MPa) lacks thrust, but an 80mm bore (2513N) is entirely undersized. The 20mm adjustment window is ideal for dialing in exact end positions during product changeovers instead of swapping a fixed-stroke SAI cylinder.
Because the stroke is 800mm, the 32mm rod needs external guidance to prevent excessive side-loading. The rear adjuster acts only as a travel stop, not a locking device; it cannot hold the load without live air, so specify SAIL or BSAI variants if true load-holding is required.
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 SAIJ125AX800-20 FAQ
At 0.5MPa operating pressure, it provides 6136N of push force and 5734N of pull force. At 0.7MPa, the push force increases to 8590N.
The rear adjuster screw allows you to trim the nominal 800mm stroke back by up to 20mm, providing a usable travel window of 780-800mm for fine-tuning the end position at commissioning.
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