Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-50S 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 SAIJ125X425-50S
The AirTAC SAIJ125X425-50-S is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a nominal 425 mm stroke that can be fine-tuned backward by up to 50 mm, creating a precise 375-425 mm usable travel window for exact end-position calibration. In this configuration, the carbon steel rod and PT tapered port threads deliver robust performance, yielding 6136 N of push force and 5734 N of pull force at 0.5 MPa.
Because this variant includes the -S magnet option, it directly supports AirTAC CMSE reed and DMSE solid-state electronic sensors via the dual-sided extruded aluminum barrel grooves. The rear adjustment mechanism functions strictly as a mechanical stop to dial in the travel end, meaning it will not hold a load if air pressure is lost. For true pneumatic locking without live pressure, users should transition to the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-50S |
|---|---|
| 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 SAIJ125X425-50S
| 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 SAIJ125X425-50S Is Used
Machine Changeover
Dial in the 375-425 mm travel window during product size transitions without swapping hardware or adding external stopper blocks.
Press Fit Tuning
Fine-tune the end-position stopper on assembly presses to accommodate varying material thicknesses while utilizing the 6136 N push force.
Heavy Material Handling
Leverage the 125 mm bore power to move heavy workpieces, using the rear adjuster to set precise resting distances on the conveyor line.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-50S the Right Cylinder?
Choose this 125 mm bore when an application demands high thrust—such as 6136 N at 0.5 MPa—that exceeds the 3927 N push capacity of the 100 mm bore variant. The 50 mm adjustable stroke range is highly advantageous during machine commissioning or product changeover, allowing operators to dial in the exact 375-425 mm end-stop without physically swapping out the cylinder or adding external spacers.
When specifying this ISO 15552 interchangeable replacement, confirm the 425 mm stroke, 50 mm adjustment range, PT port threads, and the -S magnet for CMSE/DMSE sensor integration. Because the 425 mm stroke is substantial, the 32 mm rod diameter carries significant side-load capacity, yet an external guide rail is still recommended to prevent binding on long unsupported travels. Note that SAIJ supports a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) and omits 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 SAIJ125X425-50S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. The operating speed range for this bore size is 30-500 mm/s.
The rear adjuster acts as a mechanical stop that allows you to shorten the nominal 425 mm stroke by up to 50 mm, providing a usable travel window of 375-425 mm. It is a travel stop only and does not lock or hold the load without live air pressure.
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