Airtac SAIJ125 Adjustable Cylinder SAIJ125AX25-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX25-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 25mm 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
- Stroke25 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX25-20S
The AirTAC SAIJ125X25-20-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers a robust 6136N of push force at 0.5 MPa and features a highly specific usable travel window of 5-25mm, letting you dial in the exact end position without swapping hardware. This short-stroke, high-thrust configuration is built with a SUS420J2 stainless steel rod (material code A) and includes a magnet for position sensing.
Because the adjuster acts purely as a mechanical stop and does not lock the load, live air pressure is required to maintain position during operation. The extruded aluminum barrel incorporates sensor grooves on both sides, allowing you to easily mount CMSE reed or DMSE electronic solid-state switches. Fluid must be filtered to 40 um, and operating pressure ranges from 0.15 to 1.0 MPa.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX25-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX25-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 25 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 SAIJ125AX25-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×25 | 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 SAIJ125AX25-20S Is Used
Heavy Duty Forming
Delivers 6136N of raw push force for short-stroke pressing and forming tasks, with a 5-25mm adjustable window to fine-tune material deformation depth.
Product Changeover
Quickly modify the end-stop position on a production line during format size changes, using the rear adjuster to set new travel limits without changing the cylinder.
End-of-Line Stopper
Acts as a robust physical stop for heavy pallets or workpieces, utilizing the SUS420J2 stainless steel rod to withstand repeated impact and harsh environments.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX25-20S the Right Cylinder?
Choose this 125mm bore when you need heavy thrust that smaller bores cannot provide; for context, stepping down to a 100mm bore drops the push force to 3927N at 0.5 MPa. The adjustable stroke is ideal for applications requiring variable end-stops or precise machine setup during commissioning, replacing the need for fixed-stroke SAI cylinders when exact travel distances fluctuate. If your application requires holding a load without continuous air pressure, consider an AirTAC SAIL or BSAI cylinder instead.
To match this exact ISO 15552 interchangeable replacement, specify a 125mm bore, 25mm nominal stroke, 20mm adjustment range, PT tapered port threads, and the -S magnet option. Mounting options are limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2. The 32mm rod and M27x2 rod thread provide excellent rigidity, though even with a large rod, any long unsupported stroke requires an external guide to prevent side-loading damage.
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 SAIJ125AX25-20S FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At its maximum rated pressure of 1.0 MPa, it can deliver up to 1251 kgf.
The rear mechanical screw allows you to reduce the nominal 25mm stroke by up to 20mm, creating a usable travel window of 5-25mm. This stopper only sets the travel end and does not lock the load without live air pressure.
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