This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X330, 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 SI50X330
The AirTAC Airtac SI50 Standard Cylinder SI50X330 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 330mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X330, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke330 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X330
- 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 SI50X330
The AirTAC SI50X330 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 330mm stroke. It delivers 982N push and 825N pull at 0.5MPa through a G1/4 port. AirTAC replaced this EOL unit with the SAI50X330, a direct upgrade retaining the exact interface, force, and M16x1.5 rod thread.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. For sensing, this specific no-magnet SKU cannot accept a switch; order an -S version if CS1-B/DS1-B sensors are needed.
Airtac SI50 Standard Cylinder SI50X330 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X330 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X330 |
| Bore size | Ø50 mm |
| Stroke | 330 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 SAI50X330 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 SAI50X330 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 SI50X330
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×330 | 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 SI50X330 Is Used
Package Diverting
Drives diverting arms on packaging lines where the 982N push force at 0.5MPa easily shifts cartons across transfer belts.
Gate Actuation
Opens and closes access gates or machine guards over the 330mm travel, relying on the durable ISO 15552 profile barrel.
Replacing the Airtac SI50 Standard Cylinder SI50X330 with the SAI50X330
To replace the SI50X330, order the SAI50X330. Confirm it matches your ISO 15552 mounting accessory (LB, FA, TC, etc.), 50mm bore, 330mm stroke, and G1/4 port (PT/G/NPT). This SKU lacks a magnet, so it cannot accept position sensors; if switches are required, select the -S variant for CS1-B/DS1-B compatibility. Sizing both ways: a 63mm bore offers 1559N push at 0.5MPa, while dropping to 40mm yields 628N. Because 330mm exceeds 300mm, use external guides to prevent rod bending and side-load damage. The air cushion only decelerates; it does not hold load on air loss. For static holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X330
- ✓ 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 SI50X330 FAQ
Yes, the SI50X330 is discontinued. The direct replacement is the AirTAC SAI50X330. It is dimensionally interchangeable per ISO 15552, keeping the same 50mm bore, 330mm stroke, G1/4 port, and mounting interface. The SAI simply upgrades the piston seal for longer life.
The 50mm bore features a G1/4 air port and M16x1.5 rod thread. It generates 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N push at 0.9MPa, and a theoretical max of 200kgf at 1.0MPa. Operating speed is 30-800mm/s.
Request a Quote for the SAI50X330
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X330 replacement — usually within 7-8 hours.