This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X125H, 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 SI125X125H
The AirTAC SI125 Standard Cylinder SI125X125H is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 125mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X125H, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke125 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X125H
- 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 SI125X125H
The AirTAC SI125X125H is a discontinued double-acting ISO 15552 profile cylinder featuring a 125 mm bore and 125 mm stroke. Built with an extruded aluminum barrel and a Viton H high-temperature seal, it operates from 0 to 150 C and delivers 6136 N push force at 0.5 MPa. As an end-of-line product, it is replaced by the SAI125X125H.
The SAI direct maintains the exact G1/2 port, M27x2 rod thread, and ISO 15552 mounting interface for seamless fixture integration. It upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure. Since this SKU lacks a magnet, it cannot accept a sensor.
Airtac SI125 Standard Cylinder SI125X125H Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X125H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X125H |
| Bore size | Ø125 mm |
| Stroke | 125 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 SAI125X125H 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 SAI125X125H 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 SI125X125H
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×125 | 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 SI125X125H Is Used
High-Temperature Pressing
Ideal for applying 6136 N of force in hot environments up to 150 C, utilizing the Viton H seal to maintain integrity during continuous clamping operations.
Heavy Duty Forming
Generates 8590 N of thrust at 0.7 MPa to drive heavy tooling and form thick materials, leveraging the robust 32 mm piston rod.
Replacing the Airtac SI125 Standard Cylinder SI125X125H with the SAI125X125H
To replace the SI125X125H, order the SAI125X125H. It is dimensionally interchangeable per ISO 15552, retaining the identical 125 mm bore, 125 mm stroke, G1/2 port, and mounting accessories. If sizing up or down, neighboring bores offer different force classes, but at 0.5 MPa this bore yields 6136 N push and 5734 N pull. Note that this non-magnetic SKU cannot support switches; if sensing is needed, select an SAI model with the S suffix. For high-temperature environments above 70 C, the Viton H seal option is required. Because this is a plain cylinder, it will not hold a load on air loss; the air cushion only decelerates near stroke end. For secure load holding, use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X125H
- ✓ 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 SI125X125H FAQ
Yes, the SI125X125H is discontinued. The direct replacement is the SAI125X125H. It is dimensionally interchangeable per ISO 15552, keeping the same bore, stroke, output force, G1/2 port, and mounting interface, so it drops directly into existing fixtures.
This 125 mm bore cylinder features a G1/2 port. It delivers a push force of 6136 N and a pull force of 5734 N at 0.5 MPa. At 0.7 MPa, the push force is 8590 N, and at 0.9 MPa it is 11045 N. The theoretical maximum force is 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X125H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X125H replacement — usually within 7-8 hours.