This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI200X400SN, 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 SI200X400SN
The AirTAC SI200 Standard Cylinder SI200X400SN is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø200mm bore and 400mm stroke, G3/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI200X400SN, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ200 mm
- Stroke400 mm
- Port sizeG3/4
- Acting typeDouble acting
- Rod threadM36×2.0
- StatusDiscontinued → SAI200X400SN
- 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 SI200X400SN
The AirTAC SI200X400SN is a discontinued double-acting ISO 15552 profile cylinder with a 200 mm bore and 400 mm stroke. It delivers 15708 N push force at 0.5 MPa via a G3/4 port. AirTAC replaced this legacy unit with the SAI200X400SN, a direct upgrade retaining the exact ISO 15552 mounting interface, M36x2 rod thread, and 50 mm cushions. The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The -N suffix denotes NBR seals (-20 to +70 C), with Viton H available for high heat. The -S magnet supports CS1-B/DS1-B sensors.
The SAI family also introduces SAIL, SAIF, and BSAI lock variants absent in the SI line. Note that a plain cylinder drifts without live air; the cushion only decelerates. For load holding, use an external rod lock or pilot check valve.
Airtac SI200 Standard Cylinder SI200X400SN Technical Specifications
| Model | Airtac SI200 Standard Cylinder SI200X400SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI200X400SN |
| Bore size | Ø200 mm |
| Stroke | 400 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 SAI200X400SN 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 SAI200X400SN 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 SI200X400SN
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 200 | Bore size in mm. |
| ×400 | 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 SI200X400SN Is Used
Heavy Stamp Pressing
Drives large stamping dies with 15708 N push at 0.5 MPa, utilizing the 50 mm adjustable cushions to absorb heavy impact at stroke ends.
Industrial Clamping
Secures massive fabrication assemblies during welding or machining, holding workpieces firmly with an 801 kg vertical lift margin.
Pallet Diversion
Actuates heavy-duty pallet stops and routing gates on high-capacity assembly lines, operating reliably at 30-500 mm/s.
Replacing the Airtac SI200 Standard Cylinder SI200X400SN with the SAI200X400SN
To replace the SI200X400SN, order the SAI200X400SN. It drops directly into existing fixtures via the same ISO 15552 mounting interface, 200 mm bore, 400 mm stroke, G3/4 port, and NBR seals. Verify your mounting accessory (LB, FA, TC, etc.) and confirm the -S magnet for current AirTAC switch compatibility. When sizing, the 200 mm bore yields 15708 N push at 0.5 MPa; if you need less force, step down to a 160 mm bore (10053 N push). Because this is a 400 mm stroke, use external guides to prevent rod bending and side-load damage. A standard cylinder does not hold load on air loss; for safety, specify a SAIL or BSAI lock variant, or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI200X400SN
- ✓ 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 SI200X400SN FAQ
Yes, the SI200X400SN is discontinued. The direct replacement is the AirTAC SAI200X400SN. It shares the identical ISO 15552 mounting interface, 200 mm bore, 400 mm stroke, output force, and G3/4 port, fitting existing fixtures perfectly while upgrading the piston seal.
The 200 mm bore uses a G3/4 port and a 40 mm rod. It generates 15708 N push and 15080 N pull at 0.5 MPa, 21991 N push at 0.7 MPa, and 28274 N push at 0.9 MPa. The theoretical maximum force is 3204 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI200X400SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI200X400SN replacement — usually within 7-8 hours.