Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 500mm 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
- Stroke500 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-50
The AirTAC SAIJ125X500-50 is a double-acting ISO 15552 profile cylinder featuring a rear adjustment screw that allows you to trim the effective stroke by up to 50 mm. This creates a precise 450-500 mm usable travel window, enabling exact end-position tuning at commissioning without swapping out the entire actuator. It delivers substantial thrust, providing 6136 N of push force and 5734 N of pull force at a 0.5 MPa operating pressure.
This 125 mm bore profile cylinder uses a PT tapered G1/2 port and a robust 32 mm carbon steel rod with an M27x2 thread, providing excellent rigidity. Because the 500 mm stroke is quite long, you should support the load with an external guide rail to prevent excessive side-loading on the rod. The rear adjuster acts purely as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 500 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 SAIJ125X500-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×500 | 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 SAIJ125X500-50 Is Used
Product Changeovers
Dial in the 450-500 mm travel window during format changes to accommodate different product lengths without physically swapping cylinders or bolting on external stops.
Heavy Pressing Operations
Leverage the 6136 N push force at 0.5 MPa for heavy-duty pressing and forming tasks, using the rear stopper to fine-tune the final pressing depth.
Long-Stroke Positioning
Move large components along a 500 mm path while utilizing the 50 mm adjustment to perfectly set the retracted position for precise alignment.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X500-50 the Right Cylinder?
Choose this 125 mm bore model when your application requires heavy thrust that smaller bores cannot provide, such as stepping up from a 100 mm bore that yields 3927 N push at 0.5 MPa. The 50 mm adjustment range is ideal for product changeovers on a production line, allowing operators to dial in the exact end-stop without adding external physical stops. For fixed-travel needs without the rear adjuster, the standard SAI cylinder is a simpler alternative.
If your machinery requires the load to be held in place without continuous compressed air, this cylinder's adjuster will not act as a lock; you would need to specify an AirTAC SAIL or BSAI series instead. To match this ISO 15552 replacement exactly, use a 125 mm bore, 500 mm stroke, 50 mm adjustment range, PT G1/2 port, and standard carbon steel rod. Note that SAIJ supports a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR mounts.
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 SAIJ125X500-50 FAQ
The rear of the cylinder features an external adjusting screw that acts as a mechanical stopper. For this model, you can shorten the nominal 500 mm stroke by up to 50 mm, giving you an adjustable travel window of 450 to 500 mm to fine-tune the end position.
At a 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf of thrust.
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