This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI200AX425, 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 SI200 Standard Cylinder SI200AX425
The AirTAC Airtac SI200 Standard Cylinder SI200AX425 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø200mm bore and 425mm stroke, G3/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI200AX425, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ200 mm
- Stroke425 mm
- Port sizeG3/4
- Acting typeDouble acting
- Rod threadM36×2.0
- StatusDiscontinued → SAI200AX425
- 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 SI200 Standard Cylinder SI200AX425
The AirTAC SI200AX425 is a discontinued double-acting ISO 15552 profile cylinder with a 200mm bore and 425mm stroke. It delivers 15708 N push and 15080 N pull at 0.5 MPa, utilizing a G3/4 port and a SUS420J2 stainless piston rod. As a legacy unit, its direct replacement is the SAI200AX425, matching the exact ISO 15552 mounting interface, force, and footprint.
The SAI upgrade features a revised piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. Note this SKU lacks a magnet, so it cannot accept CS1-B/DS1-B sensors. For high heat, Viton H seals raise the limit to 150 C.
Airtac SI200 Standard Cylinder SI200AX425 Technical Specifications
| Model | Airtac SI200 Standard Cylinder SI200AX425 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI200AX425 |
| Bore size | Ø200 mm |
| Stroke | 425 mm |
| Acting type | Double acting |
| Port size | G3/4 |
| Rod thread | M36×2.0 |
| 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, 50 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI200AX425 carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø200mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 15708 N | 15080 N |
| 0.7 MPa | 21991 N | — |
| Max (@1.0 MPa) | 3204 kgf | |
The SAI200AX425 produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI200 Standard Cylinder SI200AX425
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 200 | Bore size in mm. |
| ×425 | 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 SI200 Standard Cylinder SI200AX425 Is Used
Heavy Stamping
Generates 21991 N at 0.7 MPa to drive large presses and form heavy-gauge metal components securely.
Clamp Fixtures
Holds large fabricated weldments in place using the 50mm adjustable air cushions at stroke ends.
Replacing the Airtac SI200 Standard Cylinder SI200AX425 with the SAI200AX425
To replace the SI200AX425, order the SAI200AX425. Verify your ISO 15552 mounting accessories (LB, FA, CA, TC), the G3/4 air port, and the M36x2 rod thread. Because this 425mm stroke is long, use external guides to prevent rod bending and side-load damage. This non-magnetic SKU cannot take a sensor; if position detection is needed, order an SAI with the -S magnet option for current AirTAC switches. The cushion only decelerates; it does not hold load. For static holding on air loss, use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variant. If downsizing, a 160mm bore gives 10053 N push @0.5 MPa; if upsizing, you are at the maximum standard bore.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI200AX425
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI200 Standard Cylinder SI200AX425 FAQ
Yes, the SI200AX425 is discontinued. The direct replacement is the SAI200AX425. It is dimensionally interchangeable per ISO 15552, retaining the same 200mm bore, 425mm stroke, 15708 N force, G3/4 port, and mounting interface.
At 0.5 MPa it pushes 15708 N and pulls 15080 N. At 0.7 MPa push is 21991 N, at 0.9 MPa it is 28274 N, and the theoretical max is 3204 kgf at 1.0 MPa. Operating speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI200AX425
Send us the quantity and destination. We confirm price, stock and lead time on the SAI200AX425 replacement — usually within 7-8 hours.