Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-30S 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 SAIJ125X425-30S
The AirTAC SAIJ125X425-30-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a nominal 425 mm stroke that can be fine-tuned backward by up to 30 mm, creating a 395-425 mm usable travel window for exact end-position calibration during commissioning. This bore delivers 6136 N of push force at 0.5 MPa, making it suited for heavy-duty positioning tasks.
The barrel is extruded aluminum with sensor grooves on both sides, and this -S variant includes a magnet for position detection via AirTAC CMSE reed and DMSE solid-state switches. It features a carbon steel rod, PT tapered port threads, and adjustable air cushions at both ends. The rear stopper screw sets the retract end position without needing external stops, though it acts only as a travel limiter and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-30S |
|---|---|
| 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 SAIJ125X425-30S
| 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 SAIJ125X425-30S Is Used
Machine Changeover
Dial in the 425 mm stroke by up to 30 mm to accommodate different product sizes on a packaging line without changing hardware.
Heavy Pressing
Leverage 6136 N of push force at 0.5 MPa for rigid forming or pressing operations that require precise end-position limits.
Automated Assembly
Use the integrated magnet with DMSE sensors to confirm actuator position in heavy-duty automated assembly stations.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-30S the Right Cylinder?
Selecting this 125 mm bore model is appropriate when your application requires high thrust—such as the 6136 N push force at 0.5 MPa—exceeding the 3927 N of a 100 mm bore, but without stepping up to the massive 10053 N of a 160 mm cylinder. The 30 mm adjustment range is ideal for machine setups requiring variable end-stops or product-size changeovers, allowing you to dial in the exact travel distance without swapping the cylinder or bolting on external stopper blocks.
Because the stroke is 425 mm, you should ensure adequate external guiding to handle side loads, as the 32 mm rod diameter can only compensate so much over extended unsupported travel. When replacing an ISO 15552 cylinder, match the 125 mm bore, 425 mm stroke, 30 mm adjuster, PT G1/2 port, and the -S magnet requirement. Note that SAIJ uses a specific mounting subset (Basic, FA, LB, TC, FTC, TCM1, TCM2) and omits FB, CA, CB, and CR mounts. For applications requiring the load to be held without continuous air pressure, this cylinder is not a lock; consider the AirTAC SAIL or BSAI series instead.
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 SAIJ125X425-30S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force. It can deliver up to 1251 kgf at its maximum rated pressure of 1.0 MPa.
The rear adjuster screw allows you to shorten the effective travel from the nominal 425 mm down to 395 mm, providing a 395-425 mm setup window. It acts as a mechanical stop to fine-tune the end position and does not function as a lock to hold the load without air pressure.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC SAI Cylinders
Request a Quote for Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-30S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.