This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX15S, 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 SI50AX15S
The AirTAC Airtac SI50 Standard Cylinder SI50AX15S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 15mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50AX15S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke15 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50AX15S
- 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 SI50AX15S
The AirTAC SI50AX15S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 15mm stroke. It features an extruded aluminum barrel, a SUS420J2 stainless piston rod (-A), a built-in magnet (-S), and a G1/4 air port. Delivering 982 N push force at 0.5 MPa, it is replaced by the SAI50AX15S.
The SAI50AX15S is a direct replacement matching the exact ISO 15552 mounting interface, bore, and force. It upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure. The original -S magnet supports legacy CS1-B/DS1-B sensors.
Airtac SI50 Standard Cylinder SI50AX15S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX15S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX15S |
| Bore size | Ø50 mm |
| Stroke | 15 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 SAI50AX15S 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 SAI50AX15S 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 SI50AX15S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×15 | 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 SI50AX15S Is Used
Short-Stroke Clamping
Ideal for holding parts during machining with its 15mm stroke and 982 N clamping force at 0.5 MPa.
Stainless Rod Ejection
The SUS420J2 rod option provides corrosion resistance for ejecting parts in humid or washdown environments.
Vertical Pressing
Suitable for light pressing tasks, safely handling up to 589 N working loads with standard air cushions.
Replacing the Airtac SI50 Standard Cylinder SI50AX15S with the SAI50AX15S
To replace the SI50AX15S, order the SAI50AX15S. Confirm the ISO 15552 mounting interface, G1/4 port, and M16x1.5 rod thread. The -S magnet and -A SUS420J2 rod are retained. For sizing, a 50mm bore yields 982 N push at 0.5 MPa; dropping to a 40mm bore gives 628 N, while a 63mm bore provides 1559 N. A plain cylinder drifts on air loss—the cushion only decelerates—so use a pilot check valve or SAIL lock variant to hold loads. For short 15mm strokes, verify guide alignment to prevent rod binding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX15S
- ✓ 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 SI50AX15S FAQ
Yes, the SI50AX15S is discontinued. The direct replacement is the SAI50AX15S. It shares the same ISO 15552 mounting interface, 50mm bore, 15mm stroke, G1/4 port, and output force, fitting existing fixtures perfectly.
The G1/4 port bore delivers a push force of 982 N and pull of 825 N at 0.5 MPa. At 0.7 MPa push is 1374 N, and the theoretical maximum is 200 kgf at 1.0 MPa. It operates at 30-800 mm/s with 30mm adjustable cushions.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX15S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX15S replacement — usually within 7-8 hours.