Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 85mm 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
- Stroke85 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-20S
The AirTAC SAIJ125X85-20-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the travel window from 65 to 85 mm without swapping hardware. Delivering a robust 8590 N of push force at 0.7 MPa, it handles heavy-duty positioning with ease. The built-in magnet supports position detection via CMSE reed or DMSE electronic sensors.
This model uses a SUS420J2 stainless steel rod for superior corrosion resistance and features PT tapered port threads (G1/2). The extruded aluminum barrel includes sensor grooves on both sides, and the variable air cushions at both ends decelerate the load. Remember that the rear adjuster acts only as a travel stop, not a load lock, so maintain live air pressure during operation.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 85 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 SAIJ125AX85-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×85 | 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 SAIJ125AX85-20S Is Used
Machine Changeover
Dial in the 65-85 mm travel window during product size transitions to set new end stops rapidly without changing the cylinder.
Heavy Pressing
Leverage the 8590 N push force at 0.7 MPa for heavy-duty pressing operations requiring precise end-position tuning.
Automated Forming
Use the SUS420J2 stainless steel rod and adjustable rear stop in forming stations where corrosion resistance and exact stroke limits are critical.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX85-20S the Right Cylinder?
Choose this 125 mm bore when your application requires higher thrust than a 100 mm bore (which provides 5497 N push at 0.7 MPa) but less than the massive 14074 N push of a 160 mm cylinder. The 20 mm adjustment range is ideal for product changeovers, allowing you to dial in the exact end-position on the fly instead of machining external stops or reverting to a fixed-stroke SAI cylinder.
If your machine requires holding a load without continuous air pressure, the SAIJ adjuster and air cushions will not act as a brake; you would need to step up to an SAIL pneumatic lock, a BSAI clamp-lock, or an external rod lock. To replace this ISO 15552 cylinder accurately, match the 125 mm bore, 85 mm stroke, 20 mm adjustment, PT G1/2 port, and -S magnet. Since the 85 mm stroke is below the 300 mm threshold, side-load stress is minimal, but always ensure the rod thread (M27x2) is properly aligned to prevent binding.
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 SAIJ125AX85-20S FAQ
At a 0.7 MPa operating pressure, this 125 mm bore cylinder generates 8590 N of push force and 5734 N of pull force. It can reach a maximum push force of 11045 N at 0.9 MPa.
The rear adjuster screw allows you to shorten the nominal 85 mm stroke by up to 20 mm, providing a usable travel window of 65 to 85 mm. It acts as a mechanical stop to fine-tune the end position and does not lock the load without live air pressure.
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