This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X150-20S, 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 SIJ125X150-20S
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X150-20S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 150mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X150-20S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke150 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X150-20S
- 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 SIJ125X150-20S
The AirTAC SIJ125X150-20S is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 125 mm bore and 150 mm maximum stroke. An external stop screw lets you trim the extend stroke by up to 20 mm on-site, yielding a usable 130-150 mm extension window. The direct replacement is the SAIJ125X150-20S, matching the interface, force, and mounting.
The SAIJ successor retains the ISO 15552 dimensions but upgrades to a two Y-shaped one-way piston seal for lower start-up pressure and longer life. The -S suffix denotes a built-in piston magnet for legacy CS1-B/DS1-B switches. The external stop sets the end position but is not a load lock; for held loads use an external rod lock or the SAIL/BSAI variants.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X150-20S Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X150-20S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X150-20S |
| Bore size | Ø125 mm |
| Stroke | 150 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 SAIJ125X150-20S 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 SAIJ125X150-20S 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 SIJ125X150-20S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×150 | 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 SIJ125X150-20S Is Used
Press Fit Tuning
Dialing in a 130-150 mm press stroke for inserting bearings without machining hard stops.
Variable Carton Flap Folding
Adjusting the extend endpoint on-site to fold varying carton depths accurately.
End-of-Line Stopper Gates
Fine-tuning the actuator extension to act as a physical stop for mixed pallet heights.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X150-20S with the SAIJ125X150-20S
To replace the discontinued SIJ125X150-20S, order the exact direct replacement SAIJ125X150-20S, which preserves the 150 mm stroke, 20 mm adjust window, G1/2 port, and 125 mm bore. Choose the 20 mm adjust window when you need precise 130-150 mm extend tuning. Mounting interfaces (Basic, FA, LB, TC) reuse directly. The -S magnet supports CS1-B/DS1-B sensors. For stroke lengths >=300 mm, verify the side-load capacity to prevent rod deflection.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X150-20S
- ✓ 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 SIJ125X150-20S FAQ
Yes, the SIJ125X150-20S is discontinued. The direct replacement is the SAIJ125X150-20S, offering the same ISO 15552 interface, 125 mm bore, 150 mm stroke, 20 mm adjust window, G1/2 port, and mounting options.
The external stop screw provides a 20 mm adjust window, allowing the extend stroke to be shortened from the 150 mm maximum down to 130 mm on-site. The stop sets end position and does not lock the load.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X150-20S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X150-20S replacement — usually within 7-8 hours.