Airtac SAIJ125 Adjustable Cylinder SAIJ125X115-50S
The AirTAC SAIJ125 Adjustable Cylinder SAIJ125X115-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 115mm stroke, G1/2 air ports and adjustable end cushioning. Its standardized mounting interface makes it interchangeable with other ISO 15552 cylinders at the mounting interface.
- BoreØ125 mm
- Stroke115 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X115-50S
The AirTAC SAIJ125X115-50-S is a double-acting, double-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It features a carbon steel piston rod and a PT tapered port thread. Because it includes the -S magnet option, it directly supports AirTAC CMSE reed and DMSE solid-state sensors via the dual-side barrel grooves for precise end-of-stroke detection.
With a nominal 115 mm stroke and a 50 mm adjustment range, this SKU provides a usable travel window of 65 to 115 mm. This allows you to dial back the retract position by up to 50 mm during commissioning or product changeovers without swapping the cylinder or adding external stops.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X115-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X115-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 115 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 | 5734 N | 5734 N |
| 0.7 MPa | 8027 N | — |
| Max (@1.0 MPa) | 1169 kgf | |
Double-rod model: the rod passes through the rear cover, so both piston faces lose rod area and push is shown at the annular-area value. Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ125 Adjustable Cylinder SAIJ125X115-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×115 | 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 SAIJ125X115-50S Is Used
Variable End-Stop Positioning
Dial in the exact retract distance between 65 and 115 mm for product-size changes on the line without physically replacing the actuator.
Machine Commissioning Tuning
Fine-tune the end-of-stroke position during initial setup to perfect timing and avoid mechanical crashes, using the rear stopper screw.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X115-50S the Right Cylinder?
The adjustable stroke is ideal when you need variable end-stops for machine setup, rather than relying on a fixed-stroke SAI cylinder. The 32 mm rod and M27x2 thread handle high side loads well, but for any stroke over 300 mm, an external guide is recommended to prevent rod bending.
For ISO 15552 replacement matching, ensure your setup specifies a 125 mm bore, 115 mm stroke, 50 mm adjustment, PT port thread, and a -S magnet. Remember that the rear adjuster acts only as a travel stop and does not hold the load without live air pressure; for true fail-safe load holding, consider the SAIL or BSAI series instead.
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 SAIJ125X115-50S FAQ
At the maximum 1.0 MPa pressure, it delivers up to 1251 kgf.
The rear adjuster screw lets you shorten the effective travel from the nominal 115 mm down to 65 mm, creating a 65-115 mm adjustable window. It acts as a mechanical stop to trim the retract position and is not a lock, meaning the cylinder requires live air to maintain position.
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