Airtac SAIJ125 Adjustable Cylinder SAIJ125X80-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X80-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 80mm 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
- Stroke80 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X80-50S
The AirTAC SAIJ125X80-50-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136N of push force at 0.5MPa and features a built-in magnet for CMSE or DMSE sensors. The rear adjustment screw allows you to trim the nominal 80mm stroke back by up to 50mm, creating a precise 30-80mm usable travel window for product changeovers without adding external stops.
This 125mm bore unit uses PT tapered G1/2 ports and a robust 32mm carbon steel rod with an M27x2 thread. It runs at speeds of 30-500mm/s and includes variable air cushions at both ends to decelerate heavy loads smoothly. The adjuster acts purely as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X80-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X80-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 80 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 SAIJ125X80-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×80 | 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 SAIJ125X80-50S Is Used
Product Changeovers
Quickly dial the stroke from 80mm down to 30mm via the rear screw when running different package sizes on the same line.
End-Position Tuning
Fine-tune the exact retract stop during machine commissioning without swapping out the entire cylinder body.
Variable End Stops
Set custom travel limits for multi-stage assembly processes using the 50mm adjustment range and dual air cushions.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X80-50S the Right Cylinder?
Choose this adjustable-stroke model when your machine setup requires frequent end-position tuning or variable product-size stops. Unlike a fixed-stroke SAI cylinder, the SAIJ125X80-50-S lets you dial in the exact travel distance during commissioning. If your application needs less force, consider dropping to the 100mm bore (3927N at 0.5MPa), or step up to the 160mm bore (10053N at 0.5MPa) for heavier payloads.
Because the nominal stroke is only 80mm, side-load stress is minimal, but you should still guide heavy loads externally. The rear adjuster and air cushions only set the travel end and decelerate the piston; neither will hold your load without live air. For true fail-safe load holding, select a SAIL (air-released lock) or BSAI (clamp-lock) cylinder instead. This SKU is dimensionally interchangeable per ISO 15552 and supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts.
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 SAIJ125X80-50S FAQ
At 0.5MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.9MPa, the push force increases to 11045N.
The rear adjuster screw lets you mechanically shorten the 80mm nominal stroke by up to 50mm, giving a usable travel window of 30-80mm. The adjuster acts as a physical stop and does not lock the load without live air pressure.
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