Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 900mm 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
- Stroke900 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-50
The AirTAC SAIJ125X900-50 is a double-acting, single-rod ISO 15552 profile cylinder engineered for heavy-duty positioning. It delivers 6136N of push force and 5734N of pull force at 0.5 MPa, scaling up to 11045N push at 0.9 MPa. A rear-mounted stroke adjuster allows you to trim the effective travel, creating an 850 to 900mm usable window to perfectly dial in the retract end-position without swapping hardware.
This 125mm bore utilizes a G1/2 port and a robust 32mm carbon steel rod with an M27x2 thread, providing substantial rigidity for high-load tasks. The extruded aluminum barrel features dual sensor grooves, though this specific configuration omits the magnet, meaning CMSE or DMSE electronic switches must be specified separately if position detection is required.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 900 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 SAIJ125X900-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×900 | 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 SAIJ125X900-50 Is Used
Heavy Fixture Positioning
Dial in the exact retract distance of large welding or machining fixtures across a 850-900mm window to accommodate different workpiece dimensions.
Pallet Diverting
Adjust the stroke end-stop on the fly during line changeovers to handle varying pallet sizes without repositioning the cylinder mount.
Automated Press Setup
Fine-tune the bottoming position of a heavy-duty press cylinder during commissioning to prevent over-travel and crushing delicate components.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-50 the Right Cylinder?
Select this 125mm bore when an 80mm cylinder (providing 2513N push at 0.5 MPa) cannot meet your thrust requirements, but stepping up to a 160mm bore (10053N at 0.5 MPa) would be excessive. The 50mm adjustment range is ideal for fine-tuning machinery during product changeovers, eliminating the need to bolt on external physical stops. Because the 900mm stroke is substantial, an external guide mechanism is strongly recommended to prevent excessive rod side-loading and premature seal wear.
When specifying a replacement, verify the 125mm bore, 900mm stroke, 50mm adjustment, PT tapered port thread, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Remember that the rear adjuster functions strictly as a travel stop and does not hold the load without continuous air pressure; for dead-load holding, consider an AirTAC SAIL or BSAI 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 SAIJ125X900-50 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.9 MPa, the push force increases to 11045N.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the nominal 900mm stroke by up to 50mm. This creates an adjustable travel window between 850mm and 900mm for precise end-position tuning.
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