Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-50
The AirTAC SAIJ125 Adjustable Cylinder SAIJ125X850-50 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 interchangeable with other ISO 15552 cylinders at the mounting interface.
- BoreØ125 mm
- Stroke850 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-50
The AirTAC SAIJ125X850-50 is a double-acting, double-rod ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. By turning the rear screw, you can trim the effective travel back by up to 50mm, creating a precise 800-850mm usable stroke window without needing external stops.
This bore size utilizes a PT tapered G1/2 port and a 32mm carbon steel rod with an M27x2 thread, providing substantial rigidity. The extruded aluminum barrel incorporates sensor grooves on both sides for CMSE reed or DMSE electronic switches. It retains the standard variable air cushion at both ends to manage kinetic energy across its 30-500mm/s operating speed range.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-50 |
|---|---|
| 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 | 5734 N | 5734 N |
| 0.7 MPa | 8027 N | — |
| Max (@1.0 MPa) | 1169 kgf | |
Double-rod model: the rod passes through the rear cover, so both piston faces lose rod area and push is shown at the annular-area value. Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-50
| 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 SAIJ125X850-50 Is Used
Heavy Press Positioning
Dial in the exact 800-850mm end-of-stroke for large pressing or forming operations, ensuring precise contact without over-traveling the heavy load.
Pallet Changeover Stops
Adjust the retract stopper on the fly when switching between different pallet sizes on a transfer line, avoiding mechanical rebuilds.
Long-Stroke Material Handling
Move heavy workpieces over 850mm of travel while using the rear screw to fine-tune the handoff position to downstream stations.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-50 the Right Cylinder?
The 50mm adjustment window is ideal for fine-tuning the retract end-position during machine commissioning or product changeovers, eliminating the need to swap out a fixed-stroke SAI cylinder. Because the nominal stroke is 850mm, an external guide is recommended to prevent excessive side-loading on the rod.
This adjustable stopper only sets the travel end and does not hold the load without live air pressure; for true load-holding, consider an external rod lock, a pilot-operated check valve, or the SAIL/BSAI locking cylinder variants. To match this ISO 15552 footprint exactly, confirm the 125mm bore, 850mm stroke, PT port thread, and the reduced SAIJ mounting 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 SAIJ125X850-50 FAQ
At 0.7MPa, the push force increases to 8590N.
The rear adjuster acts as a mechanical stop that shortens the nominal 850mm stroke by up to 50mm, giving an effective travel window of 800-850mm. It sets the end position but does not lock the load without continuous air pressure.
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Standard models are processed and dispatched in 3-5 business days.
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