This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID200X400S, 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 SID Series Double-Rod Cylinder SID200X400S
The AirTAC Airtac SID Series Double-Rod Cylinder SID200X400S 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 SAID200X400S, 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 → SAID200X400S
- 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 SID Series Double-Rod Cylinder SID200X400S
The AirTAC SID200X400S is a discontinued double-acting double-rod ISO 15552 cylinder where a rod exits both ends on one piston. Both faces use the rod-side area, so push and pull force are equal at 15080 N @0.5 MPa, 21110 N @0.7 MPa, and 27141 N @0.9 MPa. The bore is 200 mm, the piston rod is Ø40 mm with an M36x2 thread, and the air port is G3/4. It includes a 50 mm adjustable air cushion at each end, operates at 30-500 mm/s, and features a built-in piston magnet (-S) for legacy CS1-B/DS1-B switches.
The direct replacement is the SAID200X400S, matching the ISO 15552 mounting interface, bore, stroke, and force. The SAI family uses an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. A plain cylinder does not hold its load on air loss; the cushion only decelerates near stroke end, so use an external rod lock for held loads.
Airtac SID Series Double-Rod Cylinder SID200X400S Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID200X400S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID200X400S |
| 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 SAID200X400S 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 SAID200X400S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SID Series Double-Rod Cylinder SID200X400S
| 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 SID Series Double-Rod Cylinder SID200X400S Is Used
Twin-Tool Machining Station
Drives two opposing machining heads from a single 200 mm bore piston, utilizing the equal both-ways force to ensure balanced cutting pressure on both stroke directions.
Anti-Rotation Transfer Unit
Moves heavy workpieces along a 400 mm stroke with high torsional stability. The dual rods prevent rotation without needing external linear guides.
Equal-Force Push-Pull Divider
Separates heavy palletized loads by pushing and pulling with identical 15080 N force at 0.5 MPa, ensuring consistent positioning regardless of travel direction.
Replacing the Airtac SID Series Double-Rod Cylinder SID200X400S with the SAID200X400S
To replace the discontinued SID200X400S, use the SAID200X400S directly—it shares the exact ISO 15552 mounting interface, 200 mm bore, 400 mm stroke, and G3/4 port. Size both ways by checking the equal-both-ways force (15080 N @0.5 MPa) against your dynamic load; if you need less force, step down to the 160 mm bore, or step up if exceeding safe limits. A double-rod design is right when you need anti-rotation stability or want to drive two tools from one piston. Mounting options include Basic, FA, LB, and TC. Because the stroke is 400 mm, add external guides to prevent rod bending under side loads. The -S suffix means the magnet is present for legacy CS1-B/DS1-B sensors.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID200X400S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SID Series Double-Rod Cylinder SID200X400S FAQ
Yes, the SID200X400S is discontinued. The direct replacement is the SAID200X400S. It matches the ISO 15552 mounting interface, 200 mm bore, 400 mm stroke, G3/4 port, and equal-both-ways force. The SAI replacement also adds an upgraded piston seal and uses current AirTAC switches instead of legacy CS1-B/DS1-B.
Because it is a double-rod cylinder, force is equal both ways: 15080 N @0.5 MPa, 21110 N @0.7 MPa, and 27141 N @0.9 MPa. The air port is G3/4, the rod is Ø40 mm with an M36x2 thread, and it has a 50 mm adjustable cushion at each end. Speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAID200X400S
Send us the quantity and destination. We confirm price, stock and lead time on the SAID200X400S replacement — usually within 7-8 hours.