Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 350mm 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
- Stroke350 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-50
The AirTAC SAIJ125X350-50 is a double-acting ISO 15552 profile cylinder engineered for heavy-duty tasks, delivering 6136N of push force at 0.5MPa. It features a 350mm nominal stroke paired with a rear mechanical adjuster that trims the retract end position. This yields a 300-350mm usable travel window, allowing operators to dial in the exact endpoint during commissioning without swapping hardware.
This bore utilizes a 32mm carbon steel rod with an M27x2 thread and a 40mm cushion length to absorb kinetic energy. The extruded aluminum barrel includes sensor grooves on both sides for CMSE or DMSE switches. Mounting options span Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR configurations.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 350 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 SAIJ125X350-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×350 | 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 SAIJ125X350-50 Is Used
Product Changeover
Fine-tune the 300-350mm travel window quickly via the rear screw when switching between part families on the same line, avoiding external stop hardware.
Heavy Payload Positioning
Leverage 6136N of push force at 0.5MPa to move heavy fixtures into exact alignment, using the adjuster to set the precise final end position.
Assembly Line Setup
Dial in the exact retract distance during initial machine commissioning to perfect pressing or clamping depths without machining custom spacers.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-50 the Right Cylinder?
Select this 125mm bore when a 100mm cylinder (providing 3927N push at 0.5MPa) lacks the necessary thrust for moving heavy jigs or payloads. The 50mm adjustment window is ideal for production lines running mixed product sizes, as it replaces the need to bolt on external stops during changeovers. Because the rear screw acts only as a travel stop and the air cushion solely manages deceleration, neither will hold a load without live air pressure. For positive load-holding, utilize an external pilot-operated check valve or specify a SAIL pneumatic lock cylinder.
When replacing an ISO 15552 cylinder, match the 125mm bore, 350mm stroke, 50mm adjustment range, PT tapered port thread, and the specific mounting style. Given the 350mm stroke, the extended 32mm rod requires an external guide to prevent excessive side-loading and premature seal wear. The standard carbon steel rod handles general industrial environments, while operating speed is capped at 30-500mm/s for this large bore.
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 SAIJ125X350-50 FAQ
At 0.5MPa operating pressure, this 125mm bore cylinder generates 6136N of push force and 5734N of pull force. At 0.7MPa, the push force increases to 8590N.
The rear adjuster acts as a mechanical stop that shortens the effective travel from the 350mm nominal stroke down to a minimum of 300mm. It sets the end position but does not lock the load without continuous air pressure.
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