This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125AX200S, 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 SI125AX200S
The AirTAC SI125 Standard Cylinder SI125AX200S 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 SAI125AX200S, 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 → SAI125AX200S
- 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 SI125AX200S
The AirTAC SI125AX200S is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 200 mm stroke. It delivers 6136 N push force at 0.5 MPa. The direct replacement is the SAI125AX200S, which matches the exact ISO 15552 mounting interface, G1/2 port, and M27x2 rod thread.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure. The -A suffix indicates a SUS420J2 stainless rod, and -S provides a magnet for CS1-B/DS1-B sensors.
Airtac SI125 Standard Cylinder SI125AX200S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125AX200S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125AX200S |
| 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 SAI125AX200S 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 SAI125AX200S 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 SI125AX200S
| 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 SI125AX200S Is Used
Heavy Stamping
Drives large presses and stamping fixtures requiring 6136 N push force at 0.5 MPa with stable 200 mm travel.
Pallet Handling
Indexes heavy pallets on packaging lines, utilizing the G1/2 port and ISO 15552 interface for rigid mounting.
Automated Clamping
Secures large workpieces in machining cells where the SUS420J2 stainless rod prevents corrosion from coolant.
Replacing the Airtac SI125 Standard Cylinder SI125AX200S with the SAI125AX200S
To replace the SI125AX200S, order the SAI125AX200S. Verify the ISO 15552 mounting accessory (LB, FA, TC, etc.), the G1/2 port, and the -S magnet. Sizing both ways: a 100 mm bore offers 3927 N push at 0.5 MPa, while a 160 mm bore offers 10053 N. The cushion only decelerates; for load holding on air loss, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. The SUS420J2 rod resists corrosion. Speed is 30-500 mm/s.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125AX200S
- ✓ 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 SI125AX200S FAQ
Yes, the SI125AX200S is discontinued. The direct replacement is the SAI125AX200S. It shares the same ISO 15552 mounting interface, 125 mm bore, 200 mm stroke, force, G1/2 port, and accessories, fitting existing fixtures perfectly.
The G1/2 port cylinder delivers 6136 N push and 5734 N pull at 0.5 MPa, 8590 N push at 0.7 MPa, 11045 N at 0.9 MPa, and a theoretical max of 1251 kgf at 1.0 MPa. Speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125AX200S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125AX200S replacement — usually within 7-8 hours.