This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X65, 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 SI50X65
The AirTAC Airtac SI50 Standard Cylinder SI50X65 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 SAI50X65, 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 → SAI50X65
- 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 SI50X65
The AirTAC SI50X65 is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 65 mm stroke, delivering 982 N push and 825 N pull at 0.5 MPa through a G1/4 port. The direct replacement is the SAI50X65, sharing the same 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 non-magnet SKU cannot take a sensor.
Airtac SI50 Standard Cylinder SI50X65 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X65 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X65 |
| 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 SAI50X65 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 SAI50X65 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 SI50X65
| 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 SI50X65 Is Used
Package Diverting
Actuates diverting arms on packaging lines where 982 N push at 0.5 MPa easily handles medium-weight cartons.
Clamp Actuation
Provides reliable clamping force for machining fixtures, utilizing the 825 N pull force at 0.5 MPa.
Gate Control
Operates heavy sorting gates in distribution centers, with the 65 mm stroke offering rapid cycle times.
Replacing the Airtac SI50 Standard Cylinder SI50X65 with the SAI50X65
To replace the SI50X65, order the SAI50X65 and confirm the ISO 15552 mounting interface, 65 mm stroke, and G1/4 port. Because this SKU lacks the -S magnet, it cannot accept a CS1-B or DS1-B sensor; order a magnet-equipped SAI if position detection is required. If you need higher force, the adjacent 63 mm bore provides 1559 N push at 0.5 MPa; if you need less, the 40 mm bore offers 628 N. For load holding on air loss, remember the cushion only decelerates; use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X65
- ✓ 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 SI50X65 FAQ
Yes, the SI50X65 is discontinued. The direct replacement is the SAI50X65, a current-production ISO 15552 profile cylinder. It matches the 50 mm bore, 65 mm stroke, G1/4 port, and mounting dimensions, fitting existing fixtures perfectly.
The 50 mm bore features a G1/4 air port and provides 982 N push / 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, 1767 N push at 0.9 MPa, and a theoretical maximum of 200 kgf at 1.0 MPa.
Request a Quote for the SAI50X65
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X65 replacement — usually within 7-8 hours.