Airtac SAIJ125 Adjustable Cylinder SAIJ125X115-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X115-20S 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 a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ125 mm
- Stroke115 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X115-20S
The AirTAC SAIJ125X115-20-S is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers 6136N of push force at 0.5 MPa and provides a usable travel window of 95 to 115 mm, letting you dial back the nominal 115 mm stroke by up to 20 mm. This built-in adjustability allows for precise end-position tuning during commissioning without the need to swap cylinders or bolt on external stops.
Equipped with a carbon steel piston rod and a PT tapered port thread, this 125 mm bore unit operates at speeds of 30-500 mm/s. The extruded aluminum barrel includes sensor grooves on both sides, and the integrated magnet (-S) supports position detection via AirTAC CMSE reed or DMSE solid-state switches. The rear adjuster and variable air cushions manage end-of-stroke deceleration, but neither component locks the load; for dead-load holding without live air pressure, consider the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X115-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X115-20S |
|---|---|
| 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 | 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 SAIJ125X115-20S
| 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 SAIJ125X115-20S Is Used
Product Changeover
Dial in the 95-115 mm stroke window during line changeovers to accommodate varying package lengths without swapping hardware.
End-Position Tuning
Fine-tune the retraction point at machine commissioning using the rear screw, avoiding the need to add external mechanical stops.
Variable End Stops
Adjust the effective travel end on the fly for automated assembly processes requiring slight dimensional offsets per batch.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X115-20S the Right Cylinder?
Select this 125 mm bore model when an application requires high force (6136N push at 0.5 MPa) alongside variable end-stop positioning. If your setup only needs 4523N of push force, stepping down to the 80 mm bore reduces physical size and air consumption, whereas moving up to a 160 mm bore yields 10053N for heavier loads. The 20 mm adjustment range is ideal for product changeovers where the exact retraction point shifts slightly, replacing the need for a fixed-stroke SAI cylinder when exact dimensions are unknown at the design stage.
For ISO 15552 dimensional interchangeability, match the 125 mm bore, 115 mm stroke, PT port, and your required mounting accessory. SAIJ supports a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2, explicitly omitting FB, CA, CB, and CR brackets. Because the 115 mm stroke is relatively short, external side-load guides are less critical here than on longer strokes, but the 32 mm rod diameter still handles moderate side loads well.
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 SAIJ125X115-20S FAQ
The rear adjusting screw acts as an external stopper that can shorten the effective stroke by up to 20 mm. This creates a usable travel window of 95 to 115 mm, allowing you to fine-tune the retraction end-position without replacing the cylinder.
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136N of push force and 5734N of pull force. It can reach up to 11045N push force at 0.9 MPa.
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