Airtac SAIJ125 Adjustable Cylinder SAIJ125X200-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X200-50 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 SAIJ125X200-50
The AirTAC SAIJ125X200-50 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the nominal 200 mm travel by up to 50 mm. This yields a usable 150-200 mm end-position window, enabling precise fine-tuning at commissioning or during product changeovers without swapping out the barrel or adding external stops. It delivers 6136 N of push force at 0.5 MPa, scaling up to 11045 N at 0.9 MPa.
The 32 mm carbon steel rod and M27x2 thread provide a robust interface for heavy loads, while the PT tapered port threads ensure a tight, high-pressure pneumatic connection. As an extruded aluminum profile cylinder, it features sensor grooves on both sides for CMSE reed or DMSE electronic switches (requires a magnet). The rear adjuster acts purely as a travel stop and deceleration point—it does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X200-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X200-50 |
|---|---|
| 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 SAIJ125X200-50
| 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 SAIJ125X200-50 Is Used
Variable End-Stop Forming
Dial in the exact retraction depth between 150 and 200 mm for multi-size metal forming or pressing tasks without changing tooling.
Product Changeover Diverter
Quickly reposition the rear stopper to accommodate different package lengths on a packaging line, ensuring precise sorting.
Machine Setup Tuning
Fine-tune the end-of-stroke position during initial machine commissioning to perfect timing and avoid mechanical hard crashes.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X200-50 the Right Cylinder?
Selecting this 125 mm bore over a 100 mm version steps the thrust up from 3927 N to 6136 N at 0.5 MPa, whereas dropping to an 80 mm bore drops it to 2513 N. The 50 mm adjustment range is ideal for machinery requiring variable end-stops or setup flexibility between production runs. Since the stroke is 200 mm, side-load risks are moderate, but an external guide is recommended for heavy off-center loads.
For a drop-in ISO 15552 replacement, match the 125 mm bore, 200 mm stroke, 50 mm adjustment, PT port threads, and standard carbon steel rod. Note that SAIJ uses a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) and omits FB, CA, CB, and CR mounts. If your application requires true load-holding without continuous air pressure, use an SAIL air-released lock or BSAI clamp-lock cylinder instead of relying on the rear stopper.
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 SAIJ125X200-50 FAQ
The rear adjuster screw lets you shorten the effective 200 mm stroke by up to 50 mm, providing a 150-200 mm travel window. It functions as a mechanical stop to set the end position and does not lock the load without live air pressure.
At 0.5 MPa, it provides 6136 N of push force and 5734 N of pull force. At 0.9 MPa, the push force increases to 11045 N.
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