Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 950mm 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
- Stroke950 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-40
The AirTAC SAIJ125X950-40 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the effective travel window from 910 to 950 mm without swapping the barrel. Built with a carbon steel rod and PT tapered port threads, it delivers 8590 N of push force at 0.7 MPa, making it well-suited for moving heavy fixtures. This adjustable-stroke design eliminates the need to bolt on external stops during machine commissioning or product-size changeovers.
The rear adjustment mechanism acts purely as a travel stop, not a locking device, meaning it cannot hold a load safely without live air pressure. For applications requiring true fail-safe load holding, you would need to explore the SAIL pneumatic lock series or an external rod lock. This 125 mm bore profile cylinder includes standard variable air cushions at both ends to manage deceleration, and its extruded aluminum barrel features sensor grooves on both sides for mounting CMSE reed or DMSE electronic switches if needed.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 950 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 SAIJ125X950-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×950 | 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 SAIJ125X950-40 Is Used
Heavy Fixture Positioning
Dial in the exact retract distance from 910 to 950 mm during machine commissioning to accommodate multi-product tooling plates without machining new hard stops.
Large Package Diverter
Adjust the end position on the fly to handle varying pallet sizes on a heavy-duty sorting line, using the rear stopper to fine-tune the diverter arm reach.
Press Stroke Tuning
Regulate the precise bottoming distance of a high-force pressing operation, leveraging the 6136 N at 0.5 MPa to seat components accurately before full retraction.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-40 the Right Cylinder?
Choose this 125 mm bore if your application requires high thrust—stepping down to a 100 mm bore drops the 0.5 MPa push force to 3927 N, whereas this model provides 6136 N at the same pressure. The 40 mm adjustment range is ideal when you need a variable end-stop to dial in the exact retract position during setup, rather than committing to a fixed-stroke SAI cylinder. Because the 950 mm stroke is substantial and the rod diameter is 32 mm, an external guide is highly recommended to prevent excessive side-loading and premature seal wear over long travels.
When matching this ISO 15552 cylinder for a replacement, verify the 950 mm nominal stroke, 40 mm adjustment code, G1/2 port, and the specific mounting interface. SAIJ supports a reduced set of mounts including Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR styles found on other variants.
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 SAIJ125X950-40 FAQ
At an operating pressure of 0.7 MPa, this 125 mm bore cylinder generates 8590 N of push force and 8050 N of pull force. At the maximum pressure of 1.0 MPa, it can deliver up to 1251 kgf.
The rear adjuster screw allows you to shorten the nominal 950 mm stroke by up to 40 mm, creating a usable travel window of 910 to 950 mm. This stopper only sets the end position and does not lock the load; live air pressure is still required to hold the load in place.
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