This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX60S, 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 SI50AX60S
The AirTAC Airtac SI50 Standard Cylinder SI50AX60S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 60mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50AX60S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke60 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50AX60S
- 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 SI50AX60S
The AirTAC SI50AX60S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore, 60mm stroke, and a SUS420J2 stainless piston rod. Delivering 982 N push at 0.5 MPa, it is replaced by the SAI50AX60S. This direct keeps the same G1/4 port, M16x1.5 thread, and 30 mm cushions. The SAI upgrades the piston seal to two Y-shaped one-way elements for low start-up pressure. It also adds SAIL, SAIF, and BSAI variants the SI lacked.
The built-in magnet works with legacy CS1-B/DS1-B sensors, while the SAI uses current AirTAC switches. Note that air cushions only decelerate; use a pilot check valve for load holding.
Airtac SI50 Standard Cylinder SI50AX60S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX60S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX60S |
| Bore size | Ø50 mm |
| Stroke | 60 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 SAI50AX60S 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 SAI50AX60S 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 SI50AX60S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×60 | 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 SI50AX60S Is Used
Stainless Rod Clamping
Ideal for packaging lines where the SUS420J2 rod resists washdown moisture while providing 982 N of clamping force.
Short-Stroke Diversion
The 60mm stroke quickly actuates diverters or gates, safely handling a 589 N working load at 0.5 MPa.
Replacing the Airtac SI50 Standard Cylinder SI50AX60S with the SAI50AX60S
To replace the SI50AX60S, order the SAI50AX60S. It drops into existing ISO 15552 fixtures with the same 50mm bore, 60mm stroke, G1/4 port, and mounting. Keep the -S magnet for current AirTAC switches (legacy CS1-B/DS1-B) and the -A SUS420J2 rod. If you need more force, the 63mm bore gives 1559 N push at 0.5 MPa; if less, the 40mm gives 628 N. For load holding on air loss, do not rely on the cushions—they only decelerate. Specify the SAIL lock, BSAI clamp-lock, or an external pilot check valve. A Viton H seal raises heat resistance to 150 C.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX60S
- ✓ 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 SI50AX60S FAQ
Yes, the SI50AX60S is discontinued. The direct replacement is the SAI50AX60S. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 60mm stroke, G1/4 port, and mounting interface, but features an upgraded two Y-shaped one-way piston seal.
The 50mm bore uses a G1/4 air port. It generates 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a theoretical max of 200 kgf at 1.0 MPa. The rod is Ø20 mm with an M16x1.5 thread and 30 mm adjustable cushions.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX60S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX60S replacement — usually within 7-8 hours.