Airtac SAIJ125 Adjustable Cylinder SAIJ125AX1000-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX1000-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 1000mm 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
- Stroke1000 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX1000-20S
The AirTAC SAIJ125X1000-20-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136N of push force at 0.5MPa and features a 1000mm nominal stroke that can be fine-tuned down by up to 20mm, creating a precise 980-1000mm usable travel window. This built-in adjustability allows you to dial in the exact retract end-position at commissioning without swapping out the cylinder or fabricating external stop blocks.
This model includes a SUS420J2 stainless steel rod for enhanced corrosion resistance and is magnet-equipped (-S) for seamless integration with AirTAC CMSE reed and DMSE electronic sensors. The extruded aluminum barrel features sensor grooves on both sides, and the PT tapered port threads ensure a robust pneumatic connection. Operating speed ranges from 30-500mm/s, supported by 40mm variable air cushions at both ends to decelerate the heavy 125mm bore load.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX1000-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX1000-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 1000 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 SAIJ125AX1000-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×1000 | 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 SAIJ125AX1000-20S Is Used
Long-Stroke Press Tuning
Fine-tune the 980-1000mm retract position precisely during machine commissioning to accommodate varying material thicknesses without adding external stop blocks.
Product Changeover Systems
Quickly adjust the end-stop by up to 20mm when switching product sizes on a long-stroke transfer line, minimizing downtime between production runs.
Heavy Load Positioning
Leverage the 6136N push force at 0.5MPa to move heavy assemblies along a 1000mm path, using the rear screw to perfectly set the final resting position.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX1000-20S the Right Cylinder?
Choose this 125mm bore cylinder when an application requires substantial thrust—6136N push at 0.5MPa (or 8590N at 0.7MPa)—over a long 1000mm stroke, but still needs micro-adjustments to the end-stop. If the full 1000mm travel is unnecessary, stepping down to an 80mm bore offers 2513N push force at 0.5MPa, saving physical space. Because the stroke is 1000mm, an external guide is strongly recommended to prevent excessive side-loading on the 32mm rod. The rear adjuster acts purely as a travel stop for position tuning; it is not a lock. For load-holding without live air pressure, select the SAIL or BSAI series instead.
To match this exact ISO 15552 interchangeable footprint for a direct replacement, confirm the following: 125mm bore, 1000mm stroke, 20mm adjustment range, PT port threads, SUS420J2 rod material, and the -S magnet option. Mounting options are limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, and CR).
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 SAIJ125AX1000-20S FAQ
At 0.5MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. If pressure is increased to 0.7MPa, the push force rises to 8590N.
The rear adjuster screw allows you to shorten the effective stroke by up to 20mm, providing a usable travel window of 980-1000mm. This stopper fine-tunes the end position but does not lock the load without continuous air pressure.
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