Airtac SAIJ125 Adjustable Cylinder SAIJ125X200-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X200-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 200mm 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
- Stroke200 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X200-50S
The AirTAC SAIJ125X200-50-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a 150 to 200 mm usable travel window, allowing you to dial back the nominal 200 mm stroke by up to 50 mm during commissioning. Delivering 6136 N of push force at 0.5 MPa, it is built for heavy-duty positioning.
This -S variant includes a magnet for CMSE reed and DMSE electronic solid-state sensors, which seat directly into the extruded aluminum barrel grooves on both sides. It uses a PT tapered port and a 32 mm carbon steel rod with an M27x2 thread, providing high rigidity against side loads. The mounting set covers Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X200-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X200-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 200 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 SAIJ125X200-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×200 | 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 SAIJ125X200-50S Is Used
Variable Forming Stops
Dial in the exact 150 to 200 mm retraction point for metal forming operations without machining new hard stops.
Product Changeover Diverters
Quickly adjust the stroke by up to 50 mm on a conveyor diverter when switching to a different package size.
Machine Setup Tuning
Fine-tune the end-of-stroke position during machine commissioning to prevent over-travel and optimize cycle timing.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X200-50S the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (3927 N at 0.5 MPa) lacks the thrust for your product changeover stops, but a 160 mm bore is unnecessarily large. The 50 mm adjustment window is ideal for tuning variable end positions on the fly without swapping cylinders or adding external stops.
For ISO 15552 replacements, match the 125 mm bore, 200 mm stroke, 50 mm adjustment, PT ports, and the -S magnet. Note that the rear adjuster acts only as a travel stop and does not hold the load without live air; for fail-safe load holding, use an external rod lock or consider the SAIL or BSAI series. The 200 mm stroke is well within standard limits, but always ensure external guides support any heavy lateral loads.
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 SAIJ125X200-50S FAQ
At 0.5 MPa it provides 6136 N of push force and 5734 N of pull force. At the maximum operating pressure of 1.0 MPa, it delivers up to 1251 kgf.
A rear external stopper screw lets you shorten the effective travel from the 200 mm nominal stroke down to 150 mm. This allows precise end-position tuning without changing the cylinder itself.
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