Airtac SAIJ80 Adjustable Cylinder SAIJ80X125-50S
The AirTAC Airtac SAIJ80 Adjustable Cylinder SAIJ80X125-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø80mm bore and 125mm stroke, G3/8 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ80 mm
- Stroke125 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- CushionAdjustable, 36 mm
About the Airtac SAIJ80 Adjustable Cylinder SAIJ80X125-50S
The AirTAC SAIJ80X125-50-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a 25 mm diameter carbon steel rod and generates 2513 N of push force at 0.5 MPa. By turning the rear stopper screw, you can shorten the effective travel from its 125 mm nominal length, creating a precise 75-125 mm usable window for exact end-position tuning.
This adjustable design eliminates the need to physically swap cylinders or bolt on external stops during machine changeovers. It includes a built-in magnet for use with AirTAC CMSE reed and DMSE electronic sensors, and utilizes variable air cushions at both ends to decelerate the load. The rear adjuster acts strictly as a travel stop, so it will not hold the load without live air pressure.
Airtac SAIJ80 Adjustable Cylinder SAIJ80X125-50S Technical Specifications
| Model | Airtac SAIJ80 Adjustable Cylinder SAIJ80X125-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø80 mm |
| Stroke | 125 mm |
| Acting type | Double acting |
| Port size | G3/8 |
| Rod thread | M20×1.5 |
| 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 – 800 mm/s |
| Cushion | Adjustable, 36 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 (Ø80mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 2513 N | 2268 N |
| 0.7 MPa | 3519 N | — |
| Max (@1.0 MPa) | 513 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ80 Adjustable Cylinder SAIJ80X125-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 80 | Bore size in mm. |
| ×125 | 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 SAIJ80 Adjustable Cylinder SAIJ80X125-50S Is Used
Variable End-Stop Tuning
Dial in the exact retract position within the 75-125 mm window during machine setup, avoiding the need to disassemble the cylinder to add mechanical shims.
Product Size Changeover
Quickly adjust the stroke length on packaging lines when switching to a different carton size, using the rear screw to set the new travel limit.
Deceleration Calibration
Pair the 50 mm stroke adjustment with the standard variable air cushions to perfectly tune the end-of-stroke deceleration for heavy moving loads.
Is the Airtac SAIJ80 Adjustable Cylinder SAIJ80X125-50S the Right Cylinder?
Choose this 80 mm bore when an application requires more thrust than a 63 mm cylinder provides (which delivers 1559 N at 0.5 MPa), but without stepping up to the heavier 100 mm frame. The 50 mm adjustment range is ideal for production lines running multiple product sizes, allowing operators to fine-tune the retract distance quickly during commissioning.
Because the stroke is 125 mm, side-load stress is minimal, though the M20x1.5 rod thread handles standard guiding duties well. To replace an ISO 15552 cylinder, match the 80 mm bore, 125 mm stroke, PT tapered port threads, and the -S magnet option. Note that SAIJ supports a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) and omits FB, CA, CB, and CR brackets. For load-holding without live pressure, consider an external pilot-operated check valve or the SAIL lock 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 SAIJ80 Adjustable Cylinder SAIJ80X125-50S FAQ
At 0.5 MPa operating pressure, this 80 mm bore cylinder generates 2513 N of push force and 2268 N of pull force. It can reach a maximum push force of 4523 N at 0.9 MPa.
The rear adjuster screw lets you mechanically shorten the 125 mm nominal stroke by up to 50 mm, providing a usable travel window of 75 to 125 mm. This allows you to fine-tune the end position at commissioning without changing the cylinder.
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