Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-10S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-10S 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 SAIJ125AX850-10S
The AirTAC SAIJ125X850-10-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that trims the effective travel to an 840-850 mm window. It delivers 6136 N of push force and 5734 N of pull force at 0.5 MPa, utilizing a 32 mm SUS420J2 stainless steel rod with an M27x2 thread. Because the 850 mm stroke exceeds the standard 1500 mm maximum for this bore, it is manufactured as a non-standard made-to-order unit.
This model includes a magnet for position sensing, working seamlessly with AirTAC CMSE reed and DMSE electronic solid-state switches housed in the dual-side sensor grooves of the extruded aluminum barrel. The PT tapered G1/2 port provides pneumatic connectivity, while the 40 mm adjustable air cushions at both ends manage impact deceleration. The rear adjuster acts strictly as a travel stop for fine end-position tuning and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-10S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-10S |
|---|---|
| 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 SAIJ125AX850-10S
| 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 SAIJ125AX850-10S Is Used
Variable End-Stop Tuning
Dial in the exact 840 to 850 mm retract position during machine setup without adding external mechanical stops.
Product Size Changeover
Quickly adjust the stroke length by up to 10 mm to accommodate slightly different product lengths on an automated line.
Long-Stroke Positioning
Use the high 6136 N thrust capacity and 850 mm travel to move heavy assemblies into a precise final position before clamping.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-10S the Right Cylinder?
Choose this 125 mm bore adjustable-stroke cylinder when your application requires high thrust with exact end-position tuning during commissioning or product changeover, avoiding the need to swap out a fixed-stroke SAI cylinder. If your force requirements are lower, stepping down to a 100 mm bore yields 3927 N of push force at 0.5 MPa. For load-holding without live air pressure, this cylinder is insufficient as the rear adjuster is only a stop; consider an SAIL air-released lock or BSAI clamp-lock cylinder instead. To match this exact ISO 15552 replacement, specify the 125 mm bore, 850 mm stroke, 10 mm adjustment, PT G1/2 port, SUS420J2 rod, and the -S magnet. Given the 850 mm stroke, the long unsupported travel requires an external guide to prevent excessive side-loading on the rod.
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 SAIJ125AX850-10S FAQ
At 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.
The rear adjuster screw allows you to shorten the nominal 850 mm stroke by up to 10 mm, providing a usable travel window of 840 to 850 mm. This stopper fine-tunes the end position but does not lock or hold the load without continuous air pressure.
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