This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X600H, 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 SI125 Standard Cylinder SI125X600H
The AirTAC SI125 Standard Cylinder SI125X600H is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 600mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X600H, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke600 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X600H
- 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 SI125 Standard Cylinder SI125X600H
The AirTAC SI125X600H is a discontinued double-acting ISO 15552 profile cylinder featuring a high-temperature Viton H seal (0-150 C). With a 125mm bore and 600mm stroke, it delivers 6136N push force at 0.5MPa via a G1/2 port. The direct replacement is the SAI125X600H, matching the interface, bore, stroke, force, and mounting.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life, while adding SAIL and BSAI lock variants the SI lacked. This non-magnet SKU cannot take a sensor, unlike legacy CS1-B/DS1-B switches.
Airtac SI125 Standard Cylinder SI125X600H Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X600H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X600H |
| Bore size | Ø125 mm |
| Stroke | 600 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 SAI125X600H 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 SAI125X600H produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI125 Standard Cylinder SI125X600H
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×600 | 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 SI125 Standard Cylinder SI125X600H Is Used
Heavy Stamp Press Feed
Drives robust 600mm displacement cycles into heavy-duty presses, utilizing the 6136N thrust at 0.5 MPa to shift large billets reliably.
High-Temp Ejection
Leverages the Viton H seal to operate up to 150 C, ejecting freshly machined or molded components without degrading the cylinder internals.
Pallet Transfer
Executes long 600mm strokes to push heavy industrial pallets between parallel conveyor lines, requiring external guides to manage side loads.
Replacing the Airtac SI125 Standard Cylinder SI125X600H with the SAI125X600H
To replace the SI125X600H, order the SAI125X600H direct, confirming the ISO 15552 mounting interface, 125mm bore, 600mm stroke, G1/2 port, and Viton H high-temp seal. If moving loads, a 100mm bore gives 3927N [email protected], while a 160mm bore yields 10053N. Because this SKU lacks a magnet, it cannot use CS1-B/DS1-B sensors. A plain cylinder drifts on air loss; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. For the 600mm stroke, use external guides to prevent rod bending and side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X600H
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI125 Standard Cylinder SI125X600H FAQ
Yes, the SI125X600H is discontinued. The direct replacement is the SAI125X600H. It is dimensionally interchangeable per ISO 15552, keeping the same 125mm bore, 600mm stroke, G1/2 port, and mounting fixtures.
It features a G1/2 port and delivers 6136N push / 5734N pull at 0.5 MPa, 8590N push at 0.7 MPa, 11045N push at 0.9 MPa, and a theoretical max of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X600H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X600H replacement — usually within 7-8 hours.