This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX45, 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 SI50AX45
The AirTAC Airtac SI50 Standard Cylinder SI50AX45 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 45mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50AX45, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke45 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50AX45
- 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 SI50AX45
The AirTAC SI50AX45 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 45mm stroke, delivering 982N push force at 0.5MPa via a G1/4 port. AirTAC replaced this legacy unit with the SAI50AX45, a direct upgrade retaining the exact interface, dimensions, and 200kgf max output.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. This specific SKU uses a SUS420J2 stainless rod (-A) for corrosion resistance but lacks a magnet, meaning it cannot accept position sensors.
Airtac SI50 Standard Cylinder SI50AX45 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX45 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX45 |
| Bore size | Ø50 mm |
| Stroke | 45 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 SAI50AX45 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 SAI50AX45 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 SI50AX45
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×45 | 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 SI50AX45 Is Used
Corrosion-Resistant Clamping
Ideal for fixture clamping in humid washdown areas, utilizing the SUS420J2 stainless rod to resist rust while providing 982N of secure holding force at 0.5MPa.
Short-Stroke Diverting
Executes precise 45mm routing movements on packaging lines, leveraging the 30-800mm/s speed range to push products cleanly without overshooting the stop.
Replacing the Airtac SI50 Standard Cylinder SI50AX45 with the SAI50AX45
To replace the discontinued SI50AX45, order the SAI50AX45. Verify your ISO 15552 mounting interface, G1/4 port, and M16x1.5 rod thread. Because this SKU lacks the -S magnet, it cannot support CS1-B/DS1-B sensors; if position detection is needed, select an SAI50X45S. Sizing both ways: this 50mm bore yields 982N push at 0.5MPa, while a neighbouring 63mm bore offers 1559N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external pilot check valve or explore the SAIL lock or BSAI clamp-lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX45
- ✓ 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 SI50AX45 FAQ
Yes, the AirTAC SI50AX45 is discontinued. The direct replacement is the SAI50AX45. It matches the ISO 15552 mounting interface, 50mm bore, 45mm stroke, 982N force, and G1/4 port, fitting existing fixtures perfectly.
This double-acting cylinder uses a G1/4 air port. The thrust ratings are: 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N push at 0.9MPa, and a theoretical maximum of 200kgf at 1.0MPa.
Request a Quote for the SAI50AX45
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX45 replacement — usually within 7-8 hours.