This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X25-20S, with the same bore, stroke, output force, port and mounting, so it fits the same application. The SAI replacement keeps the same ISO 15552 mounting interface, bore, stroke, output force and accessories, so it drops straight into existing fixtures. It is the current-production version of this cylinder with an upgraded piston seal.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X25-20S
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X25-20S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 25mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X25-20S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke25 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X25-20S
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X25-20S
The AirTAC SIJ125X25-20S is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 125 mm bore and 25 mm maximum extend stroke. An external stop screw lets you trim the extend stroke by up to 20 mm on-site, yielding a usable 5-25 mm end position. The direct replacement is the SAIJ125X25-20S, retaining the same interface, force, and adjust window.
The SAIJ upgrade introduces an improved two-piece Y-shaped piston seal for lower start-up pressure and longer life. The stop screw sets the end position but is not a lock; loads will drift on air loss, so use an external rod lock or SAIL/BSAI variant for holding.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X25-20S Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X25-20S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X25-20S |
| Bore size | Ø125 mm |
| Stroke | 25 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2.0 |
| 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 standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAIJ125X25-20S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / 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 | |
The SAIJ125X25-20S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X25-20S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×25 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SI-family variants: SID (double rod), SIJ (adjustable stroke) — each maps to its SAI equivalent (SID→SAID, SIJ→SAIJ). Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B).
Where the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X25-20S Is Used
Short-Stroke Clamping
Adjusts the extend contact point on the fly to accommodate varying workpiece heights without repositioning the fixture.
Variable Diverter Gate
Tunes the actuator end position in a sorting line to alter the deflection angle for different package profiles.
Adjustable Stopper Arm
Provides an on-site adjustable physical stop for pallets, allowing the extend stroke to be shortened to match pallet dimensions.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X25-20S with the SAIJ125X25-20S
To replace the discontinued SIJ125X25-20S, order the direct replacement SAIJ125X25-20S, which preserves the 125 mm bore, 25 mm nominal stroke, 20 mm adjust window, G1/2 port, and ISO 15552 mounting. Select the 20 mm adjust window if your assembly requires fine-tuning the extend stroke down to 5 mm. Reuse existing FA, LB, or TC mounts. The -S suffix provides a piston magnet for position sensing. Because the stroke is under 300 mm, side-load rod deflection is minimal, but note the stop screw only sets end position and does not lock the load.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X25-20S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X25-20S FAQ
Yes, the SIJ125X25-20S is discontinued. The direct replacement is the SAIJ125X25-20S, which shares the same ISO 15552 interface, 125 mm bore, 25 mm stroke, 20 mm adjust window, G1/2 port, and mounting options. The SAIJ family also uses an upgraded piston seal for longer life.
The external stop screw provides a 20 mm adjust window, allowing you to trim the 25 mm nominal extend stroke down to 5 mm on-site. The stop sets end position only and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X25-20S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X25-20S replacement — usually within 7-8 hours.