Airtac SAIJ125 Adjustable Cylinder SAIJ125AX225-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX225-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 225mm 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
- Stroke225 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX225-50
The AirTAC SAIJ125X225-50 is a double-acting, single-rod ISO 15552 profile cylinder engineered for heavy-duty tasks requiring exact end-position tuning. A rear adjusting screw allows you to shorten the 225 mm nominal stroke by up to 50 mm, creating a precise 175-225 mm usable travel window. This on-cylinder fine-tuning is ideal for product changeovers, eliminating the need to swap hardware or bolt on external stops. It delivers 6136 N of push force at 0.5 MPa and 8590 N at 0.7 MPa.
Built with a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance, this 125 mm bore unit features a PT tapered port thread and dual-sided sensor grooves. The variable air cushions at both ends decelerate the load, but remember the rear adjuster is a travel stop, not a lock. The cylinder will not hold its position without live air pressure. For load-holding requirements, consider an AirTAC SAIL or BSAI series cylinder.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX225-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX225-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 225 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 SAIJ125AX225-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×225 | 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 SAIJ125AX225-50 Is Used
Variable End-Stop Setup
Dial in the exact retract position within the 175-225 mm window during machine commissioning to accommodate varying material thicknesses without changing cylinders.
Product Line Changeover
Quickly shorten the effective stroke by up to 50 mm when switching the production line to a different package size, minimizing downtime.
Heavy-Duty Positioning
Leverage the 6136 N push force at 0.5 MPa to move heavy pallets or fixtures into a tuned final position before a secondary process begins.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX225-50 the Right Cylinder?
Select this 125 mm bore model when an 80 mm bore is insufficient, as stepping up from the 80 mm's 2513 N push force to 6136 N at 0.5 MPa provides massive thrust for high-inertia loads. The adjustable stroke is chosen over a fixed SAI cylinder when commissioning requires dialing in the exact retract position without mechanical rework. Because the nominal stroke is 225 mm, an external guide is recommended to manage side loads and prevent rod binding.
To match this ISO 15552 interchangeable cylinder exactly, specify a 125 mm bore, 225 mm stroke, 50 mm adjustment range, PT port thread, and no magnet. The mounting set is limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR styles found on other variants.
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 SAIJ125AX225-50 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
A rear screw stopper trims the 225 mm nominal stroke back by up to 50 mm, giving a usable travel window of 175-225 mm. This stopper sets the end position but does not lock the load without continuous air pressure.
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