This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX165, 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 SI50AX165
The AirTAC Airtac SI50 Standard Cylinder SI50AX165 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 165mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50AX165, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke165 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50AX165
- 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 SI50AX165
The AirTAC SI50AX165 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 165mm stroke. It delivers 982N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI50AX165, sharing identical mounting, force, and porting.
This SKU features a SUS420J2 stainless piston rod for corrosion resistance but lacks a magnet, so it cannot accept a sensor. The SAI upgrade uses two Y-shaped piston seals for low start-up pressure. Note: cushions only decelerate; use SAIL or BSAI for load holding.
Airtac SI50 Standard Cylinder SI50AX165 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX165 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX165 |
| Bore size | Ø50 mm |
| Stroke | 165 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 SAI50AX165 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 SAI50AX165 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 SI50AX165
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×165 | 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 SI50AX165 Is Used
Corrosive Material Handling
The SUS420J2 stainless rod excels in moist washdown environments, providing 982N of push force to index components through machining cells.
Mid-Range Transfer Diverters
Delivering a 165mm stroke to push medium-weight cartons between parallel conveyor lines without requiring magnetic feedback.
Replacing the Airtac SI50 Standard Cylinder SI50AX165 with the SAI50AX165
To replace the SI50AX165, order the SAI50AX165. Verify the ISO 15552 mounting interface, 165mm stroke, G1/4 port, and M16x1.5 thread. This non-magnet SKU cannot take CS1-B/DS1-B sensors. If sizing up, the 63mm bore yields 1559N at 0.5MPa; sizing down, the 40mm bore yields 628N. For load holding on air loss, the cushion only decelerates—choose the SAIL or BSAI lock variant, or an external pilot check valve. The SAI family also adds the SAIF self-valve option.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX165
- ✓ 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 SI50AX165 FAQ
Yes, the SI50AX165 is discontinued. The direct replacement is the SAI50AX165. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 165mm stroke, 982N force, and G1/4 port to fit existing fixtures.
It features a G1/4 air port. Force ratings are 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, and 1767N push at 0.9MPa. The theoretical maximum force is 200kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX165
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX165 replacement — usually within 7-8 hours.