This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X900SH, 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 SI50X900SH
The AirTAC SI50 Standard Cylinder SI50X900SH 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 SAI50X900SH, 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 → SAI50X900SH
- 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 SI50X900SH
The AirTAC SI50X900SH is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 900mm stroke. Delivering 982N push force at 0.5MPa via a G1/4 port, it is replaced by the SAI50X900SH. This direct successor matches the exact ISO 15552 mounting interface, bore, stroke, output force, and accessories. The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life.
This -S and -H configured model includes a piston magnet for legacy CS1-B/DS1-B switches and uses Viton H seals for 0-150C high-temperature environments. The SAI family also introduces SAIL, SAIF, and BSAI lock or valve variants absent in the SI line. Note that standard cylinders drift on air loss; use an external rod lock or pilot check valve for load holding.
Airtac SI50 Standard Cylinder SI50X900SH Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X900SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X900SH |
| 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 SAI50X900SH 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 SAI50X900SH 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 SI50X900SH
| 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 SI50X900SH Is Used
High-Temp Ejection
Uses the Viton H seal to withstand 0-150C ambient heat while ejecting molded parts over a 900mm reach.
Long-Reach Transfer
Pushes products across wide conveyor gaps; guide the 900mm rod to prevent side-load wear during transit.
Replacing the Airtac SI50 Standard Cylinder SI50X900SH with the SAI50X900SH
To replace the discontinued SI50X900SH, order the SAI50X900SH direct, verifying the ISO 15552 interface, 50mm bore, 900mm stroke, G1/4 port, and mounting accessory. The -S magnet enables current AirTAC switches (replacing legacy CS1-B/DS1-B), while the -H Viton seal handles 0-150C heat. Sizing both ways: this 50mm bore yields 982N push at 0.5MPa; if undersized, the 63mm bore provides 1559N. For the 900mm stroke, add external guides to prevent rod bending and side-load wear. A plain cylinder does not hold load without live air; the cushion only decelerates. For secure holding, specify the SAIL lock variant or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X900SH
- ✓ 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 SI50X900SH FAQ
Yes, the SI50X900SH is discontinued. The direct replacement is the SAI50X900SH. It shares the identical ISO 15552 mounting interface, 50mm bore, 900mm stroke, output force, G1/4 port, and accessories, fitting existing fixtures perfectly while upgrading the piston seal.
The G1/4 port and 20mm rod deliver 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, and a theoretical max of 200kgf at 1.0MPa. Speed is 30-800mm/s, with 30mm adjustable air cushions at both ends.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X900SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X900SH replacement — usually within 7-8 hours.