Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 425mm 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
- Stroke425 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-50
The AirTAC SAIJ125X425-50 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 375 to 425 mm, allowing you to dial back the 425 mm nominal stroke by up to 50 mm during commissioning. This bore size delivers a robust 6136 N pull force at 0.5 MPa, making it suitable for heavy-duty positioning tasks.
The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting. It supports a speed range of 30 to 500 mm/s and uses a PT tapered G1/2 port. The mounting set covers Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, deliberately omitting FB, CA, CB, and CR brackets to streamline your setup.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 425 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 SAIJ125X425-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×425 | 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 SAIJ125X425-50 Is Used
Heavy Press Tuning
Dial in the exact 375 to 425 mm retraction distance on heavy press assemblies during initial setup.
Product Changeover
Quickly adjust the end-stop by up to 50 mm on packaging lines handling varying package sizes.
Material Handling
Position large material carts or pallets precisely, leveraging the 6136 N pull force for heavy loads.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-50 the Right Cylinder?
Choose this 125 mm bore when a 100 mm cylinder (delivering 3681 N pull at 0.5 MPa) cannot provide enough force, but a 160 mm bore is physically oversized. The 50 mm adjustment screw is ideal for fine-tuning end positions during product changeovers without swapping cylinders or adding external stops. Because the 425 mm stroke is substantial, an external guide is recommended to manage side loads on the 32 mm carbon steel rod.
For load-holding without live air pressure, note that the rear adjuster functions only as a travel stop, not a brake. In such cases, consider the SAIL (air-released lock) or BSAI (clamp-lock) variants. This model is dimensionally interchangeable per ISO 15552 standards, configured with a PT port, no magnet, and 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 SAIJ125X425-50 FAQ
At 0.5 MPa, it provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
The rear adjuster screw lets you shorten the 425 mm nominal stroke down to 375 mm, providing a 50 mm tuning window to set the exact retract position without external stops.
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Standard models usually ship in 3-4 days.
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