This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID200X400, 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 SID200X400
The AirTAC Airtac SID Series Double-Rod Cylinder SID200X400 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 SAID200X400, 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 → SAID200X400
- 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 SID200X400
The AirTAC SID200X400 is a 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 sets the air port to G3/4, with an M36x2 rod thread and 50 mm adjustable air cushions at each end. This SID model is discontinued and end-of-life; the direct replacement is the SAID200X400, retaining the same ISO 15552 interface, 400 mm stroke, and mounting. The SAI replacement uses an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life.
Because the second rod drives a tool or carries a cam, it provides anti-rotation and equal work in both directions. Without a -S suffix, this SKU cannot take a magnetic switch. A plain cylinder does not hold its load on air loss; the cushion only decelerates near stroke end, so use an external rod lock or pilot-operated check valve for held loads.
Airtac SID Series Double-Rod Cylinder SID200X400 Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID200X400 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID200X400 |
| 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 SAID200X400 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 SAID200X400 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 SID200X400
| 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 SID200X400 Is Used
Equal-Force Transfer
Drives a dual-sided conveyor pusher where the 15080 N @0.5 MPa equal both-ways force pushes and retracts identical loads without anti-rotation issues.
Dual-Tool Machining
Uses the second rod end to drive a secondary machining head, benefiting from the 50 mm adjustable cushions to decelerate heavy tooling at stroke limits.
Replacing the Airtac SID Series Double-Rod Cylinder SID200X400 with the SAID200X400
To replace the discontinued SID200X400, install the SAID200X400 directly—it matches the 200 mm bore, 400 mm stroke, G3/4 port, and ISO 15552 mounting. Size both ways by checking the equal-both-ways force: if 15080 N @0.5 MPa is excessive, step down to the 160 mm bore (9425 N), or if more is needed, no larger standard bore exists so parallel cylinders are required. A double rod is right when you need anti-rotation, equal force in both directions, or a back rod to drive a second tool. Mounting options include Basic, FA, LB, and TC. For the 400 mm stroke, add external guides to prevent rod bending under side loads. This non-magnetic SKU cannot take sensors.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID200X400
- ✓ 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 SID200X400 FAQ
Yes, the SID200X400 is discontinued. The direct replacement is the SAID200X400, which shares the same ISO 15552 interface, 200 mm bore, 400 mm stroke, G3/4 port, and equal both-ways force. The SAI family also adds SAIL and BSAI lock variants the SI line lacked.
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, speed is 30-500 mm/s, and it features 50 mm adjustable cushions. The cushion only decelerates, so use an external rod lock for load holding.
Related AirTAC SAI Cylinders
Request a Quote for the SAID200X400
Send us the quantity and destination. We confirm price, stock and lead time on the SAID200X400 replacement — usually within 7-8 hours.