Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-20 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 SAIJ125X225-20
The AirTAC SAIJ125X225-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a usable travel window of 205 to 225 mm, allowing you to dial back the nominal 225 mm stroke by up to 20 mm during commissioning. In this bore size, it delivers 6136 N of pull force at 0.5 MPa and reaches a maximum of 1251 kgf at 1.0 MPa.
The extruded aluminum barrel includes sensor grooves on both sides for mounting position detectors. Because this is a standard configuration without a magnet, you would need to specify the -S option to use AirTAC CMSE reed or DMSE solid-state sensors. The piston rod is carbon steel with an M27x2 thread, and the mounting set omits FB, CA, CB, and CR brackets, utilizing Basic, FA, LB, TC, FTC, TCM1, and TCM2 interfaces.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-20 |
|---|---|
| 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 SAIJ125X225-20
| 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 SAIJ125X225-20 Is Used
Variable End-Stop Forming
Dial in the exact 205 to 225 mm travel window during heavy press setups, using the rear adjuster to fine-tune the retract position without changing the cylinder.
Product Size Changeovers
Quickly reconfigure the effective stroke on a packaging line when product dimensions change, relying on the 20 mm adjustment range instead of mechanical spacers.
Heavy Assembly Jigs
Leverage the 125 mm bore's 8590 N push force at 0.7 MPa to drive large components, using the adjustable stop to account for material thickness variations.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X225-20 the Right Cylinder?
Choose this 125 mm bore cylinder when an application requires heavy thrust forces up to 6136 N (pull at 0.5 MPa) alongside variable end-stop positioning. If your process requires less force, stepping down to a 100 mm bore yields 3681 N of pull force. The adjustable stroke is ideal for product-size changeovers on a line, eliminating the need to physically swap cylinders or add external stops. The rear screw acts purely as a travel stop; it does not hold the load without live air. For true fail-safe load holding, select a SAIL (air-released lock) or BSAI (clamp-lock) cylinder. To match this ISO 15552 replacement exactly, confirm the 225 mm stroke, 20 mm adjustment, PT G1/2 port, and standard carbon steel rod.
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 SAIJ125X225-20 FAQ
The rear adjuster acts as an external stopper that lets you shorten the effective stroke by up to 20 mm. This creates a usable travel window of 205 to 225 mm, which is set during commissioning and does not alter the cylinder's standard 225 mm barrel length.
At a 0.5 MPa operating pressure, it provides 6136 N of pull force and 6136 N of push force. At the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
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