This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI200X550SLB, 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 SI200X550SLB
The AirTAC SI200 Standard Cylinder SI200X550SLB is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø200mm bore and 550mm stroke, G3/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI200X550SLB, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ200 mm
- Stroke550 mm
- Port sizeG3/4
- Acting typeDouble acting
- Rod threadM36×2.0
- StatusDiscontinued → SAI200X550SLB
- 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 SI200X550SLB
The AirTAC SI200X550SLB is a discontinued double-acting ISO 15552 profile cylinder with a 200mm bore and 550mm stroke. Built for heavy-duty tasks, it delivers 15708 N of push force at 0.5 MPa through a G3/4 port. AirTAC replaced this unit with the SAI200X550SLB, a direct upgrade retaining the exact ISO 15552 mounting interface, M36x2 rod thread, and 50mm cushions.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The SAI family also adds SAIL and BSAI lock variants absent in the SI line. Your -S code means a magnet for CS1-B/DS1-B switches, and the LB foot mount provides a rigid base.
Airtac SI200 Standard Cylinder SI200X550SLB Technical Specifications
| Model | Airtac SI200 Standard Cylinder SI200X550SLB |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI200X550SLB |
| Bore size | Ø200 mm |
| Stroke | 550 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 SAI200X550SLB 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 SAI200X550SLB 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 SI200X550SLB
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 200 | Bore size in mm. |
| ×550 | 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 SI200X550SLB Is Used
Heavy Press Forming
Drives large stamping and forming presses requiring up to 21991 N of thrust at 0.7 MPa, utilizing the 50mm adjustable cushions to absorb heavy impact at stroke ends.
Large Mold Clamping
Secures heavy industrial molds on injection machinery via the rigid LB foot mount, relying on the 40mm piston rod to maintain structural integrity.
Replacing the Airtac SI200 Standard Cylinder SI200X550SLB with the SAI200X550SLB
To replace the SI200X550SLB, order the SAI200X550SLB. Confirm the ISO 15552 LB foot mounting, 550mm stroke, G3/4 port, and the -S magnet for legacy CS1-B/DS1-B sensors (the SAI uses current AirTAC switches). Sizing both ways: a 160mm bore yields 10053 N push at 0.5 MPa, while a 200mm bore hits 21991 N at 0.7 MPa. Note that a plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock or pilot check valve for load holding, or specify an SAIL/BSAI lock variant. With a 550mm stroke, use external guides to prevent rod bending and side-load damage. Rod material options include carbon steel, SUS420J2 (A), or SUS304 (B); Viton H seals raise heat to 150 C.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI200X550SLB
- ✓ 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 SI200X550SLB FAQ
Yes, the SI200X550SLB is discontinued. The direct replacement is the SAI200X550SLB. It shares the identical ISO 15552 mounting interface, 200mm bore, 550mm stroke, output force, G3/4 port, and LB foot mount, fitting existing fixtures perfectly.
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 SAI200X550SLB
Send us the quantity and destination. We confirm price, stock and lead time on the SAI200X550SLB replacement — usually within 7-8 hours.