This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX10S, 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 SI50AX10S
The AirTAC Airtac SI50 Standard Cylinder SI50AX10S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 10mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50AX10S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke10 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50AX10S
- 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 SI50AX10S
The AirTAC SI50AX10S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore, 10mm stroke, and an SUS420J2 stainless steel rod. Generating 982N push force at 0.5MPa, it is replaced direct by the SAI50AX10S. The SAI keeps the same G1/4 port, M16x1.5 thread, and mounting interface, but adds an upgraded two Y-shaped one-way piston seal for lower start-up pressure.
The original -S magnet supports legacy CS1-B/DS1-B sensors, while the SAI uses current AirTAC switches. Note that a plain cylinder drifts without live air; use a SAIL lock variant or external pilot check valve for load holding.
Airtac SI50 Standard Cylinder SI50AX10S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX10S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX10S |
| Bore size | Ø50 mm |
| Stroke | 10 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 SAI50AX10S 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 SAI50AX10S 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 SI50AX10S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×10 | 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 SI50AX10S Is Used
Short-Stroke Clamping
Ideal for compact stainless-rod clamping of wet or washed parts, delivering 982N of push force in tight fixture spaces.
Ejector Mechanisms
Provides rapid 10mm ejection of machined components, utilizing the 30-800mm/s speed range for high-cycle automated lines.
Valve Actuation
Suitable for switching diverter valves or gates where a corrosion-resistant SUS420J2 rod and precise short travel are required.
Replacing the Airtac SI50 Standard Cylinder SI50AX10S with the SAI50AX10S
To replace the SI50AX10S, order the SAI50AX10S. It drops directly into existing ISO 15552 fixtures with identical 50mm bore, 10mm stroke, and G1/4 port. Retain the -S magnet for position sensing (legacy CS1-B/DS1-B switches; SAI uses current AirTAC switches) and the -A SUS420J2 stainless rod for corrosion resistance. For sizing, this 50mm bore yields 982N push at 0.5MPa; dropping to a 40mm bore gives 628N, while a 63mm bore provides 1559N. Because the 10mm stroke is very short, side-load risks are minimal, but avoid using the air cushion as a load brake—the cylinder drifts on air loss. For held loads, specify the SAIL or BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX10S
- ✓ 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 SI50AX10S FAQ
Yes, the SI50AX10S is discontinued. The direct replacement is the SAI50AX10S. It shares the same ISO 15552 mounting interface, 50mm bore, 10mm stroke, output force, and G1/4 port, fitting existing fixtures perfectly.
The bore features a G1/4 air port and an M16x1.5 rod thread. It delivers 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, and a theoretical maximum of 200kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX10S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX10S replacement — usually within 7-8 hours.