Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 280mm 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
- Stroke280 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-50S
The AirTAC SAIJ125X280-50-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers robust thrust, generating 8590N of push force at 0.7 MPa, making it suitable for heavy-duty positioning tasks. The integrated -S magnet enables position detection via AirTAC CMSE reed or DMSE electronic solid-state sensors housed in the dual-side barrel grooves.
This specific SKU combines a 280 mm nominal stroke with a 50 mm adjustment range, yielding a usable travel window of 230 to 280 mm. You can fine-tune the retract end-position at commissioning without adding external stops. The rod is constructed from SUS420J2 stainless steel (code A) for enhanced corrosion resistance, and the fluid porting uses a PT tapered G1/2 thread.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 280 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 SAIJ125AX280-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×280 | 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 SAIJ125AX280-50S Is Used
Product Changeover
Dial in the 230-280mm travel window during format changes on packaging lines without physically replacing the cylinder.
Heavy Positioning
Leverage 8590N of push force at 0.7MPa to move heavy pallets or fixtures into exact final positions.
Machine Setup
Fine-tune the retract end-stop during initial commissioning to perfectly align heavy mechanical stops.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX280-50S the Right Cylinder?
Select this 125 mm bore when an application requires more force than a 100 mm cylinder (which provides 5497N push at 0.7 MPa) but does not need the full 14074N capacity of a 160 mm bore. The adjustable 230-280 mm travel window is ideal for machinery that undergoes frequent product-size changeovers, allowing operators to dial in the exact end-stop mechanically rather than swapping components. For true load-holding without continuous live air pressure, note that this rear adjuster acts only as a travel stop and not a brake; you should instead specify an AirTAC SAIL or BSAI cylinder.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 280 mm stroke, 50 mm adjustment code, PT G1/2 port, and -S magnet requirement. Because the 280 mm stroke is relatively long, the 32 mm diameter rod provides substantial rigidity, but any unsupported load still requires an external guide to prevent excessive side-loading. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, deliberately omitting 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 SAIJ125AX280-50S FAQ
At 0.5 MPa it provides 6136N push and 5734N pull force. At 0.7 MPa, the push force increases to 8590N, and it reaches a maximum of 11045N push at 0.9 MPa.
The rear adjuster screw acts as a mechanical stop that trims the effective travel. For this 280mm stroke model, you can reduce the stroke by up to 50mm, creating an adjustable 230-280mm travel window without changing the cylinder.
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