This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X50SH, 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 SI50X50SH
The AirTAC Airtac SI50 Standard Cylinder SI50X50SH is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 50mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X50SH, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke50 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X50SH
- 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 SI50X50SH
The AirTAC SI50X50SH is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 50 mm stroke, delivering 982 N of push force at 0.5 MPa. It features a G1/4 air port, a 20 mm piston rod, and a high-temperature Viton H seal rated for 0 to 150 C. AirTAC replaced this legacy unit with the SAI50X50SH, a direct replacement retaining the exact ISO 15552 mounting interface, bore, stroke, output force, and port size.
The SAI upgrade introduces a refined piston seal with two Y-shaped one-way elements for lower start-up pressure and extended life. Because the SI50X50SH includes a magnet, it supports legacy CS1-B/DS1-B sensors, while the SAI family uses current AirTAC switches.
Airtac SI50 Standard Cylinder SI50X50SH Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X50SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X50SH |
| Bore size | Ø50 mm |
| Stroke | 50 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 SAI50X50SH 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 SAI50X50SH 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 SI50X50SH
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×50 | 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 SI50X50SH Is Used
Hot-End Part Ejection
Uses the 982 N push force and Viton H seal to eject molded components safely in 0-150 C thermal environments.
High-Temp Diverting
Actuates diverter arms on packaging lines where ambient heat would degrade standard NBR seals.
Replacing the Airtac SI50 Standard Cylinder SI50X50SH with the SAI50X50SH
To replace the discontinued SI50X50SH, order the SAI50X50SH direct equivalent, confirming the ISO 15552 mounting interface, 50 mm stroke, G1/4 port, and high-temp Viton H seal. The built-in magnet allows for position sensing. If you need to downsize, a 40 mm bore yields 628 N push at 0.5 MPa; if scaling up, an 80 mm bore provides 2513 N. Note that a standard cylinder drifts on air loss because the air cushion only decelerates near stroke end. For load holding, use an external pilot check valve, a rod lock, or the SAIL/BSAI lock variants. The SAI family also adds the SAIF self-valve option for bores 32-100.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X50SH
- ✓ 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 SI50X50SH FAQ
Yes, the SI50X50SH is discontinued. The direct replacement is the SAI50X50SH, which shares the identical ISO 15552 mounting interface, bore, stroke, port, and force.
It has a G1/4 air port. The thrust ratings are 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a theoretical max of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X50SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X50SH replacement — usually within 7-8 hours.