This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X165, 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 SI50X165
The AirTAC Airtac SI50 Standard Cylinder SI50X165 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 SAI50X165, 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 → SAI50X165
- 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 SI50X165
The AirTAC SI50X165 is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 165 mm stroke. It delivers 982 N push force at 0.5 MPa through a G1/4 port. The direct replacement is the SAI50X165, matching the exact interface, force, and mounting.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. Note this specific SKU lacks a magnet, so it cannot accept CS1-B or DS1-B sensors.
Airtac SI50 Standard Cylinder SI50X165 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X165 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X165 |
| 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 SAI50X165 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 SAI50X165 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 SI50X165
| 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 SI50X165 Is Used
Package Diverting
Ideal for pushing medium-weight cartons off a main conveyor line utilizing its 982 N push force.
Pallet Stops
Acts as a robust pneumatic stop gate for pallets entering a wrapping station over a 165 mm travel.
Clamp Actuation
Provides reliable clamping pressure for medium-duty aluminum fixture holding during milling.
Replacing the Airtac SI50 Standard Cylinder SI50X165 with the SAI50X165
To replace the SI50X165, order the SAI50X165. Verify your ISO 15552 mounting interface (LB, FA, TC, etc.), the 165 mm stroke, and the G1/4 port. Because this SKU has no -S magnet, it cannot support position sensing; if sensing is needed, select an SAI50X165S. If sizing up or down, a 63 mm bore yields 1559 N push at 0.5 MPa, while a 40 mm bore yields 628 N. A plain cylinder drifts on air loss; for load holding, use the SAIL or BSAI lock variant, or an external pilot check valve. Since the 165 mm stroke is below 300 mm, rod bending side-load risks are minimal.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X165
- ✓ 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 SI50X165 FAQ
Yes, the AirTAC SI50X165 is discontinued. The direct replacement is the SAI50X165. It is dimensionally interchangeable per ISO 15552, retaining the same 50 mm bore, 165 mm stroke, output force, G1/4 port, and mounting accessories.
The G1/4 port feeds a 20 mm rod. 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. Operating speed is 30-800 mm/s.
Request a Quote for the SAI50X165
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X165 replacement — usually within 7-8 hours.