Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 125mm 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
- Stroke125 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-20S
The AirTAC SAIJ125X125-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 105 to 125 mm. Delivering 6136 N of push force at 0.5 MPa, it handles heavy-duty positioning while allowing precise end-stop tuning during commissioning without external stops. The extruded aluminum barrel features sensor grooves on both sides, and the integrated -S magnet enables position sensing with AirTAC CMSE reed or DMSE electronic solid-state switches.
This model utilizes a carbon steel piston rod and PT tapered port threads. The rear adjustment screw acts purely as a mechanical stop to fine-tune the retract position; it does not lock or hold the load without live air pressure. For load-holding requirements without continuous air, consider the SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 125 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 SAIJ125X125-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | 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 SAIJ125 Adjustable Cylinder SAIJ125X125-20S Is Used
Variable End-Stop Tuning
Dial in the exact retract position within a 105-125 mm window during machine setup, replacing the need to swap out entire cylinders when adjusting for slightly different package sizes.
Heavy-Duty Forming
Leverage 6136 N of thrust at 0.5 MPa for pressing or clamping operations, using the rear stopper to fine-tune the final position based on material thickness variations.
Product Changeover Systems
Quickly adjust the effective stroke on converging assembly lines handling multiple product lengths, ensuring precise end-positioning without adding bulky external mechanical stops.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-20S the Right Cylinder?
Selecting this 125 mm bore cylinder is ideal when an application requires 6136 N of push force at 0.5 MPa and the ability to dial in the end position within a 105 to 125 mm window. If your thrust requirements are lower, stepping down to an 80 mm bore yields 2513 N at 0.5 MPa. Conversely, moving up to a 160 mm bore provides 10053 N. The adjustable stroke is chosen over a fixed-stroke SAI cylinder when you need variable end-stops for product size changeovers on a single machine.
As a dimensionally interchangeable ISO 15552 cylinder, this SKU matches standard mounting footprints using the Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounting accessories. It omits FB, CA, CB, and CR mounts. The -S magnet supports CMSE and DMSE sensors. Because the stroke is 125 mm, side-load risks are minimal, but long unsupported strokes still require an external guide to prevent rod 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 SAIJ125X125-20S FAQ
At a 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
The rear adjuster screw allows you to mechanically shorten the nominal 125 mm stroke by up to 20 mm, creating a usable travel window of 105 to 125 mm. The adjuster acts as a travel stop and does not function as a lock or brake to hold the load without continuous air pressure.
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