Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-50S 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 SAIJ125X850-50S
The AirTAC SAIJ125X850-50-S is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear stroke adjuster. It delivers 6136N of push force at 0.5 MPa and utilizes a PT tapered G1/2 port. The built-in -S magnet supports AirTAC CMSE reed and DMSE solid-state sensors for precise position detection along the 850mm travel.
This model provides a usable travel window of 800 to 850mm, allowing you to dial back the stroke by up to 50mm during machine commissioning. Equipped with a robust 32mm carbon steel rod and M27x2 thread, it handles substantial side loads, while the extruded aluminum barrel design omits tie-rods for a rigid yet compact structure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-50S |
|---|---|
| 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 SAIJ125X850-50S
| 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 SAIJ125X850-50S Is Used
Product Changeover
Dial in the exact 800-850mm end-stop during rapid format changes on packaging lines without swapping out the physical cylinder.
Heavy Material Handling
Leverage the 6136N push force at 0.5 MPa to move heavy pallets or pusher assemblies, tuning the final position to match fixture tolerances.
Press Assembly Tuning
Fine-tune the retraction end-point during machine commissioning to ensure perfect mating pressure on large automotive or industrial components.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-50S the Right Cylinder?
Select this 125mm bore cylinder when an application requires heavy thrust (6136N push at 0.5 MPa) and exact end-position tuning without external stops. If your force needs are lower, stepping down to a 100mm bore yields 3927N push at 0.5 MPa. The 50mm adjustment window is perfect for variable product sizes on a line, whereas a fixed SAI cylinder lacks this setup flexibility.
Because the 850mm stroke is substantial, an external guide is strongly recommended to manage rod side-loading and prevent premature wear. Remember that the rear adjuster acts only as a travel stop to decelerate the load; it does not hold position without live air. For true load-holding without pressure, consider an external rod lock or the AirTAC SAIL series. This unit is dimensionally interchangeable per ISO 15552 and uses the 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 SAIJ125X850-50S FAQ
At 0.5 MPa, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. If operated at 0.7 MPa, the push force increases to 8590N.
The rear adjusting screw acts as a mechanical stop, allowing you to shorten the effective travel from 850mm down to 800mm. This enables fine end-position tuning at commissioning without adding external stops.
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