Airtac SAIJ125 Adjustable Cylinder SAIJ125X200-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X200-20S 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 SAIJ125X200-20S
The AirTAC SAIJ125X200-20-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers a robust 6136N push force at 0.5 MPa and incorporates a magnet for position sensing. The built-in stopper provides a usable travel window of 180 to 200mm, allowing you to dial back the nominal 200mm stroke by up to 20mm during commissioning without adding external stops.
This extruded aluminum barrel design includes sensor grooves on both sides, directly supporting CMSE reed and DMSE solid-state switches. It uses a 32mm carbon steel rod with an M27x2 thread, paired with PT tapered ports (G1/2) and 40mm air cushions at both ends. The rear adjuster acts purely as a travel stop for end-position tuning, meaning it will not hold a load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X200-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X200-20S |
|---|---|
| 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 SAIJ125X200-20S
| 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 SAIJ125X200-20S Is Used
Product Changeover
Dial in the 180-200mm travel window during line changeovers to accommodate slightly different package sizes without swapping out the entire actuator.
Commissioning Tuning
Fine-tune the exact end-of-stroke position at machine setup to perfect timing sequences and absorb mechanical tolerances using the rear stopper.
High-Force Clamping
Leverage the 6136N thrust at 0.5MPa for heavy-duty clamping tasks where the exact final position varies by a few millimeters across different fixtures.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X200-20S the Right Cylinder?
Select this adjustable model when your machine setup requires precise end-position tuning or frequent product-size changeovers. The 20mm adjustment window lets you fine-tune the retract stroke on the fly, a major advantage over a fixed-stroke SAI cylinder. If you need to step down force to a 982N (0.5MPa) unit, consider the 50mm bore; if you need more thrust, the 160mm bore offers 10053N. For load-holding without continuous air pressure, this cylinder is insufficient as the adjuster is not a lock, so you should look at the SAIL or BSAI series. To match this ISO 15552 interchangeable unit, specify: 125mm bore, 200mm stroke, 20mm adjustment, PT port thread, and a -S magnet.
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 SAIJ125X200-20S FAQ
At 0.5MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. It can reach a maximum of 1251 kgf at 1.0MPa.
The rear adjuster acts as a mechanical stop that lets you shorten the effective stroke from 200mm down to 180mm. It sets the travel end and relies on the air cushion for deceleration, but it does not lock or hold the load without live air pressure.
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