Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 850mm 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
- Stroke850 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-40
The AirTAC SAIJ125X850-40 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a nominal 850 mm stroke with a 40 mm adjustment range, yielding a usable travel window of 810 to 850 mm for precise end-position tuning during commissioning. The 125 mm bore generates 6136 N of push force at 0.5 MPa, making it suited for heavy-duty positioning tasks.
This variant features a SUS420J2 stainless steel rod and PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting. Because the 850 mm stroke is lengthy, an external guide is recommended to manage side loads and prevent rod deflection.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 850 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 SAIJ125AX850-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×850 | 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 SAIJ125AX850-40 Is Used
Heavy Press Tuning
Fine-tune the exact bottoming position of a heavy press over its 810-850 mm window to accommodate varying material thicknesses without changing the fixture setup.
Pallet Diverter Stop
Act as an adjustable end stop on a heavy-duty conveyor line, allowing operators to quickly shift the retract distance by up to 40 mm during product size changeovers.
Automated Assembly Calibration
Provide a 6136 N push force at 0.5 MPa for heavy component seating, with the rear screw enabling micro-adjustments to the end position during initial machine commissioning.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-40 the Right Cylinder?
Choose this 125 mm bore when a smaller 100 mm cylinder (providing 3927 N at 0.5 MPa) lacks the thrust to move your load, but stepping up to a 160 mm bore (10053 N) would be excessive overkill. The 40 mm rear adjuster allows you to dial in the exact retract position on the fly without machining external stopper blocks or swapping the cylinder for a custom stroke.
Remember that the rear adjuster acts purely as a travel stop and does not lock the load without live air pressure. For fail-safe load holding, select an SAIL air-released lock or BSAI clamp-lock cylinder instead. To replace an ISO 15552 cylinder, match the 125 mm bore, 850 mm stroke, 40 mm adjustment, PT G1/2 port, and mounting from the SAIJ set (Basic, FA, LB, TC, FTC, TCM1, TCM2).
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 SAIJ125AX850-40 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push thrust and 5734 N of pull thrust. It can deliver up to 1251 kgf at its maximum 1.0 MPa pressure.
The rear adjuster screw acts as an external stopper that lets you shorten the effective stroke from 850 mm down to 810 mm. It sets the travel end and relies on the air cushion for deceleration, but it does not lock the load without continuous air pressure.
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