This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX5S, 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 SI50AX5S
The AirTAC Airtac SI50 Standard Cylinder SI50AX5S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 5mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50AX5S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke5 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50AX5S
- 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 SI50AX5S
The AirTAC SI50AX5S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore, 5mm stroke, SUS420J2 stainless rod, and a G1/4 port. It delivers 982N push force at 0.5MPa. AirTAC replaced this with the SAI50AX5S, a direct sharing the exact ISO 15552 mounting interface, bore, force, and port.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The -S magnet works with legacy CS1-B/DS1-B sensors, while a plain cylinder drifts without air; use SAIL or BSAI lock variants for holding.
Airtac SI50 Standard Cylinder SI50AX5S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX5S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX5S |
| Bore size | Ø50 mm |
| Stroke | 5 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 SAI50AX5S 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 SAI50AX5S 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 SI50AX5S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×5 | 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 SI50AX5S Is Used
Short-Stroke Clamping
Ideal for tight clamping jaws requiring a compact 5mm stroke and 982N of thrust at 0.5MPa.
Stainless Rod Ejection
The SUS420J2 rod option provides corrosion resistance for ejecting parts in humid or washdown environments.
Sensor-Ready Gating
The integrated magnet pairs with CS1-B/DS1-B switches to confirm position on small diverter gates.
Replacing the Airtac SI50 Standard Cylinder SI50AX5S with the SAI50AX5S
To replace the SI50AX5S, order the SAI50AX5S. Confirm the ISO 15552 mounting interface, the 50mm bore, the 5mm stroke, the G1/4 port, and the SUS420J2 stainless rod. Because this 5mm stroke is nonstandard, verify cushion and end-cap clearances. Sizing both ways: a 40mm bore yields 628N [email protected], while a 63mm bore yields 1559N. This plain cylinder does not hold load on air loss; the cushion only decelerates. For secure holding, use an external pilot check valve or the SAIL/BSAI lock variants. The SAIF variant adds a built-in 4M valve if needed.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX5S
- ✓ 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 SI50AX5S FAQ
Yes, the SI50AX5S is discontinued. The direct replacement is the SAI50AX5S. It shares the same ISO 15552 mounting interface, 50mm bore, 5mm stroke, force, and G1/4 port, fitting existing fixtures perfectly.
The G1/4 port bore delivers a push of 982N and pull of 825N at 0.5MPa. Push is 1374N at 0.7MPa and 1767N at 0.9MPa. The theoretical max force is 200kgf at 1.0MPa.
Request a Quote for the SAI50AX5S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX5S replacement — usually within 7-8 hours.