This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X350N, 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 SI50X350N
The AirTAC SI50 Standard Cylinder SI50X350N is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 350mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X350N, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke350 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X350N
- 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 SI50X350N
The AirTAC SI50X350N is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 350mm stroke. It delivers 982 N push force at 0.5 MPa via a G1/4 port. The direct replacement is the SAI50X350N, matching the exact interface, force, and mounting.
This SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure. Since this SI SKU lacks a magnet, it cannot accept a sensor. For load holding, note that cushions only decelerate; use an external rod lock or SAIL variant.
Airtac SI50 Standard Cylinder SI50X350N Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X350N |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X350N |
| Bore size | Ø50 mm |
| Stroke | 350 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 SAI50X350N 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 SAI50X350N 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 SI50X350N
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×350 | 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 SI50X350N Is Used
Package Diversion
Pushes cartons at 30-800 mm/s on packaging lines, utilizing the 982 N push force to redirect items without stalling.
Pallet Handling
Actuates 350mm stroke gating arms on roller conveyors, with external guides preventing side-load wear on the rod.
Replacing the Airtac SI50 Standard Cylinder SI50X350N with the SAI50X350N
To replace the SI50X350N, order the SAI50X350N. Verify the ISO 15552 mounting interface, 350mm stroke, G1/4 port, and M16x1.5 rod thread. This SKU has no magnet, so it cannot take CS1-B/DS1-B sensors. With a 350mm stroke, add external guides to prevent rod bending. The NBR seal suits -20 to +70 C; for higher heat, choose Viton H. If you need locked positioning, select the SAIL or BSAI lock variant, as standard cushions only decelerate.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X350N
- ✓ 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 SI50X350N FAQ
Yes, the SI50X350N is discontinued. The direct replacement is the SAI50X350N. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 350mm stroke, 982 N force, G1/4 port, and mounting interface.
The 50mm bore uses a G1/4 port. Force 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. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X350N
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X350N replacement — usually within 7-8 hours.