Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-40S 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 SAIJ125X425-40S
The AirTAC SAIJ125X425-40-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 40 mm, creating a precise 385-425 mm usable travel window. Delivering 6136 N of push force at 0.5 MPa, it is built to handle heavy-duty positioning tasks.
This variant includes a magnet for CMSE reed and DMSE electronic sensors, utilizing the standard carbon steel rod and PT tapered port threads. The extruded aluminum barrel features sensor grooves on both sides, and the mounting interface supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 brackets. The rear adjuster acts purely as a travel stop to dial in the end position during commissioning without requiring external stops.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-40S |
|---|---|
| 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 SAIJ125X425-40S
| 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 SAIJ125X425-40S Is Used
Variable End-Stop Positioning
Dial in the exact retraction point within the 385-425 mm window during machine commissioning to accommodate different material thicknesses without swapping cylinders.
Heavy-Duty Product Changeover
Leverage the 6136 N push force at 0.5 MPa to shift heavy pallets or fixtures, adjusting the 40 mm travel stop quickly when switching to a new product line size.
Long-Stroke Assembly Pressing
Use the 425 mm travel to reach deep into machinery, relying on the rear stopper to fine-tune the final pressing position of heavy components accurately.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-40S the Right Cylinder?
Select this 125 mm bore cylinder when an application requires substantial thrust—such as the 6136 N push force at 0.5 MPa—combined with on-the-fly end-position tuning. If your setup needs less force, stepping down to a 100 mm bore yields 3927 N at 0.5 MPa; stepping up to a 160 mm bore provides 10053 N. The adjustable 385-425 mm window is ideal for product changeovers, whereas a fixed SAI cylinder is better for rigid, unchanging endpoints. Because this is a 425 mm stroke, the M27x2 rod and piston assembly will experience leverage forces under load, so an external guide is recommended to prevent side-loading wear. To replace an ISO 15552 cylinder, match the 125 mm bore, 425 mm stroke, 40 mm adjustment, PT G3/8 port, and -S magnet. Note that the rear screw and air cushions only decelerate the load; they do not hold position without live air. For true load-holding, consider an external rod lock or the AirTAC SAIL lock cylinder.
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 SAIJ125X425-40S 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.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the effective stroke from the nominal 425 mm down to 385 mm. It sets the travel end point but does not lock or hold the load without continuous air pressure.
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