This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X200S, 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 SI125X200S
The AirTAC SI125 Standard Cylinder SI125X200S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 200mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X200S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke200 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X200S
- 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 SI125X200S
The AirTAC SI125X200S is a discontinued double-acting ISO 15552 profile cylinder with a 125mm bore and 200mm stroke. It delivers 6136N push force at 0.5MPa via a G1/2 port. The direct replacement is the SAI125X200S, matching the bore, stroke, force, and mounting interface.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure. The -S magnet works with CS1-B/DS1-B sensors, while SAI adds SAIL/BSAI lock variants.
Airtac SI125 Standard Cylinder SI125X200S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X200S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X200S |
| Bore size | Ø125 mm |
| Stroke | 200 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 SAI125X200S 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 SAI125X200S 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 SI125X200S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×200 | 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 SI125X200S Is Used
Heavy Press Operations
Drives large stamping or forming presses requiring 6136N push force at 0.5MPa, utilizing the 200mm stroke for deep draw operations.
Industrial Clamp Systems
Secures large fabricated components during machining or welding, providing rigid clamping via the ISO 15552 mounting interface.
Replacing the Airtac SI125 Standard Cylinder SI125X200S with the SAI125X200S
To replace the SI125X200S, order the SAI125X200S. Confirm the ISO 15552 mounting interface, G1/2 port, and M27x2 rod thread. The -S magnet enables CS1-B/DS1-B sensors. If you need higher force, the 160mm bore offers 10053N push at 0.5MPa; if lower, the 100mm bore provides 3927N. For load holding, note a plain cylinder drifts without air; use an external rod lock, pilot check valve, or SAIL/BSAI variant. At 200mm stroke, side-load is minimal, but always guide the rod to prevent bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X200S
- ✓ 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 SI125X200S FAQ
Yes, the SI125X200S is discontinued. The direct replacement is the SAI125X200S. It is dimensionally interchangeable per ISO 15552, retaining the same 125mm bore, 200mm stroke, force, G1/2 port, and mounting accessories.
It features a G1/2 port. Force output is 6136N push and 5734N pull at 0.5MPa, 8590N push at 0.7MPa, 11045N push at 0.9MPa, and a maximum theoretical force of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X200S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X200S replacement — usually within 7-8 hours.