This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X165S, 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 SI50X165S
The AirTAC Airtac SI50 Standard Cylinder SI50X165S 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 SAI50X165S, 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 → SAI50X165S
- 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 SI50X165S
The AirTAC SI50X165S 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 SAI50X165S, matching the interface, force and mounting exactly.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure. The original -S magnet supports CS1-B/DS1-B sensors, and Viton H seals raise heat to 150C.
Airtac SI50 Standard Cylinder SI50X165S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X165S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X165S |
| 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 SAI50X165S 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 SAI50X165S 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 SI50X165S
| 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 SI50X165S Is Used
Package Diversion
Actuates routing gates on packaging lines, utilizing the 165mm stroke to push cartons smoothly onto secondary tracks without stalling.
Clamp Actuation
Provides reliable clamping force for mid-weight aluminum fixtures during CNC machining, taking advantage of the 982N push capability at 0.5MPa.
Replacing the Airtac SI50 Standard Cylinder SI50X165S with the SAI50X165S
To replace the SI50X165S, order the SAI50X165S and verify the ISO 15552 mounting interface, 165mm stroke, G1/4 port, and M16x1.5 rod thread. The built-in -S magnet works with legacy CS1-B/DS1-B switches, while the SAI uses current AirTAC sensors. For sizing, a 40mm bore yields 628N push at 0.5MPa, whereas a 63mm bore provides 1559N. Note that a plain cylinder drifts on air loss; the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X165S
- ✓ 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 SI50X165S FAQ
Yes, the AirTAC SI50X165S is discontinued. The direct replacement is the SAI50X165S. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 165mm stroke, G1/4 port, and mounting interface for a seamless fixture swap.
This double-acting cylinder uses a G1/4 air port. It generates 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 SAI50X165S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X165S replacement — usually within 7-8 hours.