This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X200H, 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 SI125X200H
The AirTAC SI125 Standard Cylinder SI125X200H 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 SAI125X200H, 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 → SAI125X200H
- 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 SI125X200H
The AirTAC SI125X200H is a discontinued double-acting ISO 15552 profile cylinder featuring a 125 mm bore and 200 mm stroke. Built with an extruded aluminum barrel, it delivers 6136 N push force at 0.5 MPa and uses a G1/2 air port. Because this SI series is end-of-life, AirTAC replaced it with the SAI125X200H—a direct upgrade retaining the exact ISO 15552 mounting interface, bore, output force, and porting. This specific SKU includes the -H high-temperature Viton/FKM seal, raising the operating range to 0-150 C.
The SAI replacement introduces an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. Note that this non-magnetic SKU cannot accept a sensor. If your fixture requires load holding on air loss, the cushion only decelerates; you must use an external pilot check valve or migrate to the SAIL or BSAI lock variants.
Airtac SI125 Standard Cylinder SI125X200H Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X200H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X200H |
| 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 SAI125X200H 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 SAI125X200H 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 SI125X200H
| 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 SI125X200H Is Used
Hot Metal Forming
Drives heavy press dies in elevated temperature zones, leveraging the Viton H seal to maintain reliable 6136 N clamping force without thermal degradation.
High-Torque Indexing
Actuates large rotary index tables or heavy pallet lifts, utilizing the 32 mm rod and M27x2 thread to manage substantial mechanical loads safely.
Heavy Pallet Diversion
Pushes loaded pallets off high-throughput lines, where the 200 mm stroke and robust 125 mm bore provide the necessary thrust to overcome lateral friction.
Replacing the Airtac SI125 Standard Cylinder SI125X200H with the SAI125X200H
To replace the discontinued SI125X200H, order the SAI125X200H. Verify your existing fixture's ISO 15552 mounting interface (such as LB foot or TC trunnion), the 200 mm stroke, and the G1/2 port. This unit uses the -H Viton seal for 0-150 C environments. Because it lacks the -S magnet, it cannot support legacy CS1-B/DS1-B sensors; if position detection is needed, select a magnetic SAI variant. When sizing, the 125 mm bore yields 6136 N push at 0.5 MPa; dropping to a 100 mm bore provides 3927 N, while the 125 mm bore hits 8590 N at 0.7 MPa. For any load holding, the standard cylinder drifts without live air—consider the SAIL air-released lock or BSAI clamp-lock variants instead of relying on the cushion.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X200H
- ✓ 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 SI125X200H FAQ
Yes, the SI125X200H is discontinued. The direct replacement is the SAI125X200H. It shares the same ISO 15552 mounting interface, 125 mm bore, 200 mm stroke, G1/2 port, and Viton high-temperature seal, fitting directly into existing machinery.
This double-acting cylinder features a G1/2 air port and a 32 mm rod. It delivers 6136 N push and 5734 N pull at 0.5 MPa, 8590 N push at 0.7 MPa, 11045 N push at 0.9 MPa, and a theoretical maximum force of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X200H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X200H replacement — usually within 7-8 hours.