Airtac SAIJ125 Adjustable Cylinder SAIJ125AX800-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX800-50S 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 SAIJ125AX800-50S
The AirTAC SAIJ125X800-50-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster, enabling you to dial back the nominal 800 mm travel by up to 50 mm for a precise 750-800 mm usable window. It delivers 6136 N of push force at 0.5 MPa, making it suited for heavy-duty positioning tasks. The piston rod utilizes SUS420J2 stainless steel (code A), and the unit includes a magnet (-S) for direct compatibility with AirTAC CMSE reed and DMSE electronic sensors mounted in the dual-side barrel grooves.
Because the rear adjuster acts purely as a mechanical stop to set deceleration and travel endpoints, it will not hold a load without live air pressure. For load-holding without continuous supply, you must integrate an external rod lock or select related types like the SAIL or BSAI series. This SAIJ model uses a PT tapered port thread and supports the reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX800-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX800-50S |
|---|---|
| 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 SAIJ125AX800-50S
| 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 SAIJ125AX800-50S Is Used
Machine Changeover
Quickly reconfigure the 750-800 mm travel window during product size transitions without disassembling the cylinder assembly.
Heavy Positioning
Leverage 6136 N of push force at 0.5 MPa to move heavy jigs into exact alignment using the rear stopper screw.
Assembly Line Tuning
Fine-tune the end-of-stroke position during initial commissioning to perfect pressing or clamping operations on the fly.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX800-50S the Right Cylinder?
Choose this 125 mm bore when a smaller 100 mm bore (providing 3927 N at 0.5 MPa) cannot meet your thrust requirements, or step down from a 160 mm bore (10053 N at 0.5 MPa) if you need to optimize air consumption. The adjustable stroke is ideal for machine setup and product changeover, allowing you to fine-tune the end position at commissioning without swapping the entire cylinder or adding external stops.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 800 mm stroke, 50 mm adjustment, PT port, and the -S magnet requirement. Since the stroke is 800 mm, the long unsupported travel increases the risk of rod sagging and side-loading; an external guide rail is strongly recommended to prevent premature seal wear. The SAIJ mounting set omits FB, CA, CB, and CR brackets.
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 SAIJ125AX800-50S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
The rear adjuster screw lets you shorten the effective travel from the 800 mm nominal stroke by up to 50 mm, creating a 750-800 mm usable window. It functions as a travel stop and does not lock the load without live air pressure.
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