This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X65S, 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 SI50X65S
The AirTAC Airtac SI50 Standard Cylinder SI50X65S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 65mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X65S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke65 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X65S
- 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 SI50X65S
The AirTAC SI50X65S is a discontinued double-acting ISO 15552 profile cylinder featuring a 50mm bore, 65mm stroke, and a G1/4 air port. Delivering 982N push force at 0.5MPa, it is replaced by the SAI50X65S. This direct successor matches the exact mounting interface, bore, force, and port size, fitting existing fixtures perfectly.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. The -S magnet supports CS1-B/DS1-B switches, while the SAI family adds SAIL, SAIF, and BSAI lock variants the SI lacked.
Airtac SI50 Standard Cylinder SI50X65S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X65S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X65S |
| Bore size | Ø50 mm |
| Stroke | 65 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 SAI50X65S 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 SAI50X65S 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 SI50X65S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×65 | 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 SI50X65S Is Used
Package Diverting
Actuates diverting gates on packaging lines, using the 65mm stroke to push cartons smoothly onto adjacent routing belts.
Clamp Actuation
Provides reliable clamping force for machining fixtures, delivering 982N push at 0.5MPa to hold components firmly.
Stopper Gate Control
Raises and lowers pallet stopper gates in conveyor zones, where the 50mm bore offers ample force within a compact footprint.
Replacing the Airtac SI50 Standard Cylinder SI50X65S with the SAI50X65S
To replace the SI50X65S, order the SAI50X65S. Verify your ISO 15552 mounting accessory (LB, FA, TC, etc.), the G1/4 port thread (PT/G/NPT), and the -S magnet for CS1-B/DS1-B sensors. The 50mm bore yields 982N push at 0.5MPa; step down to 40mm for 628N or up to 63mm for 1559N. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock or pilot check valve for load holding, or specify the SAIL/BSAI lock variant. Rod options include carbon, SUS420J2 (A), or SUS304 (B).
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X65S
- ✓ 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 SI50X65S FAQ
Yes, the AirTAC SI50X65S is discontinued. The direct replacement is the SAI50X65S. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 65mm stroke, G1/4 port, and mounting interface.
The 50mm bore features a G1/4 air port and a 20mm rod. It delivers 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, and 1767N at 0.9MPa, with a theoretical max of 200kgf at 1.0MPa.
Request a Quote for the SAI50X65S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X65S replacement — usually within 7-8 hours.