This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X900SLB, 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 SI50 Standard Cylinder SI50X900SLB
The AirTAC SI50 Standard Cylinder SI50X900SLB is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 900mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X900SLB, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke900 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X900SLB
- 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 SI50 Standard Cylinder SI50X900SLB
The AirTAC SI50X900SLB is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore, 900mm stroke, LB foot mount, and a G1/4 port. Delivering 982N push at 0.5MPa, it is replaced by the SAI50X900SLB. This direct upgrade shares the exact ISO 15552 mounting interface, force, and stroke.
The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure. For load holding, note the cushion only decelerates; use a pilot check valve. The -S magnet works with CS1-B/DS1-B sensors.
Airtac SI50 Standard Cylinder SI50X900SLB Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X900SLB |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X900SLB |
| Bore size | Ø50 mm |
| Stroke | 900 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M16×1.5 |
| 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 – 800 mm/s |
| Cushion | Adjustable, 30 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI50X900SLB carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
The SAI50X900SLB produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI50 Standard Cylinder SI50X900SLB
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×900 | 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 SI50 Standard Cylinder SI50X900SLB Is Used
Long-Stroke Material Transfer
Pushes workpieces between machining stations over a 900mm distance, utilizing the 982N thrust class effectively.
Pallet Push-Off Assembly
Actuates a diverter arm on a packaging line, with the LB foot mount providing a stable base for the extended stroke.
Vertical Lowering Fixture
Lowers components at a controlled speed, requiring external guidance to prevent rod bending over the 900mm extension.
Replacing the Airtac SI50 Standard Cylinder SI50X900SLB with the SAI50X900SLB
To replace the SI50X900SLB, order the SAI50X900SLB. Confirm the ISO 15552 interface, 50mm bore, 900mm stroke, G1/4 port, LB foot mount, and -S magnet. Downsize to a 40mm bore (628N push) for lighter loads, or upsize to 63mm (1559N) for heavier ones. For static holding, the standard cylinder drifts on air loss; add an external rod lock or check valve, or specify an SAIL lock variant. At 900mm, prevent rod bending by guiding the load externally.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X900SLB
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI50 Standard Cylinder SI50X900SLB FAQ
Yes, the SI50X900SLB is discontinued. The direct replacement is the SAI50X900SLB. It shares the same ISO 15552 mounting interface, 50mm bore, 900mm stroke, force, and G1/4 port, fitting directly into existing LB foot mount fixtures.
It features a G1/4 air port. Force ratings are 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, and a maximum theoretical force of 200kgf at 1.0MPa. Operating speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X900SLB
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X900SLB replacement — usually within 7-8 hours.