This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X544H, 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 SI50X544H
The AirTAC SI50 Standard Cylinder SI50X544H is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 544mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X544H, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke544 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X544H
- 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 SI50X544H
The AirTAC SI50X544H is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 544mm stroke. It delivers 982N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI50X544H, sharing the same interface, force, and mounting. This SKU uses a Viton H seal for 0-150C high-temp environments but lacks a magnet, so it cannot accept position sensors.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. Because the 544mm stroke exceeds the 1200mm standard maximum, it is a nonstandard stroke requiring external guides to prevent rod bending.
Airtac SI50 Standard Cylinder SI50X544H Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X544H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X544H |
| Bore size | Ø50 mm |
| Stroke | 544 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 SAI50X544H 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 SAI50X544H 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 SI50X544H
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×544 | 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 SI50X544H Is Used
High-Temperature Ejection
Deploy the Viton H seal in rubber molding or hot-stamp ejectors where ambient heat reaches 150C, utilizing the 982N push force to clear heavy parts.
Long-Stroke Transfer
Actuate product diverters across wide conveyor belts using the 544mm stroke, ensuring external guides prevent rod bending during lateral transfers.
Replacing the Airtac SI50 Standard Cylinder SI50X544H with the SAI50X544H
To replace the SI50X544H, order the SAI50X544H. Confirm the ISO 15552 mounting interface (LB, FA, CA, TC), the G1/4 port, and the Viton H high-temperature seal requirement. This nonstandard 544mm stroke demands external guides to manage side-load and rod-bending risks. Sizing options: a 40mm bore offers 628N push at 0.5MPa, while a 63mm bore provides 1559N. This SKU has no magnet (-S) and cannot support CS1-B/DS1-B sensors. For load holding on air loss, add an external pilot check valve or rod lock, as cushions only decelerate. The SAI family also offers SAIL and BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X544H
- ✓ 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 SI50X544H FAQ
Yes, the SI50X544H is discontinued. The direct replacement is the SAI50X544H. It is dimensionally interchangeable per ISO 15552, maintaining the same 50mm bore, 544mm stroke, 982N force, G1/4 port, and mounting interface.
The 50mm bore features a G1/4 port and delivers 982N push / 825N pull at 0.5 MPa, 1374N push at 0.7 MPa, and a theoretical max of 200 kgf at 1.0 MPa. It operates at 30-800 mm/s with a 30mm adjustable air cushion.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X544H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X544H replacement — usually within 7-8 hours.