This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X115H, 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 SI50X115H
The AirTAC Airtac SI50 Standard Cylinder SI50X115H is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 115mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X115H, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke115 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X115H
- 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 SI50X115H
The AirTAC SI50X115H is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore, 115mm stroke, and a high-temperature Viton H seal rated for 0 to 150 C. Generating 982 N push force at 0.5 MPa via a G1/4 port, it is replaced direct by the SAI50X115H. This successor shares the exact interface, bore, and force, but adds an upgraded piston seal with two Y-shaped elements for lower start-up pressure.
Because this SKU lacks the -S magnet, it cannot accept a CS1-B or DS1-B sensor. Note that standard cushions only decelerate; use a SAIL lock or external pilot check valve to hold loads.
Airtac SI50 Standard Cylinder SI50X115H Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X115H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X115H |
| Bore size | Ø50 mm |
| Stroke | 115 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 SAI50X115H 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 SAI50X115H 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 SI50X115H
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×115 | 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 SI50X115H Is Used
Hot Stamp Ejection
Pushes heated parts out of a press using the Viton H seal to withstand 0-150 C ambient temperatures without degrading.
Divert Gate Actuation
Drives a routing flap on a packaging line, delivering 982 N at 0.5 MPa to deflect heavy cartons reliably.
Replacing the Airtac SI50 Standard Cylinder SI50X115H with the SAI50X115H
To replace the SI50X115H, order the SAI50X115H, confirming the ISO 15552 mounting interface, 115mm stroke, G1/4 port, and your Viton H high-temp requirement. This non-magnetic SKU cannot take a switch; if sensing is needed, select an SAI50X115HS. For load holding on air loss, remember the cushion only decelerates; specify a SAIL air-released lock, a BSAI clamp-lock, or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X115H
- ✓ 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 SI50X115H FAQ
Yes, the SI50X115H is discontinued. The direct replacement is the SAI50X115H, which matches the ISO 15552 mounting interface, 50mm bore, 115mm stroke, G1/4 port, and output force, but features an upgraded two Y-shaped element piston seal.
It features a G1/4 air port and provides 982 N push / 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. The rod is Ø20 mm with an M16x1.5 thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X115H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X115H replacement — usually within 7-8 hours.