This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X650, 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 SI50X650
The AirTAC Airtac SI50 Standard Cylinder SI50X650 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 650mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X650, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke650 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X650
- 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 SI50X650
The AirTAC SI50X650 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 650mm stroke. It delivers 982N push and 825N pull at 0.5MPa via a G1/4 port. The direct replacement is the SAI50X650, retaining identical interface, force and mounting dimensions.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. This no-magnet SKU cannot take a sensor; legacy -S types used CS1-B/DS1-B switches. Viton H seals raise heat to 150C.
Airtac SI50 Standard Cylinder SI50X650 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X650 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X650 |
| Bore size | Ø50 mm |
| Stroke | 650 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 SAI50X650 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 SAI50X650 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 SI50X650
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×650 | 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 SI50X650 Is Used
Long-Stroke Diversion
Pushes packages across a 650mm transfer gap with a 982N push force at 0.5MPa, requiring external guides to prevent rod bending.
Multi-Stage Ejection
Cycles at 30-800mm/s to eject machined aluminum profiles from a fixture, absorbing end-stop energy via 30mm cushions.
Replacing the Airtac SI50 Standard Cylinder SI50X650 with the SAI50X650
To replace this SI50X650, order the SAI50X650. Verify the ISO 15552 mounting interface, G1/4 port, M16x1.5 rod thread and 30mm cushions. Because this is a no-S SKU, it cannot accept a magnetic sensor. For sizing, the neighboring 63mm bore yields 1559N push at 0.5MPa, while dropping to 40mm provides 628N. At 650mm stroke, add external guides to prevent rod bending and side-load wear. The cushion only decelerates; for load holding on air loss, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X650
- ✓ 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 SI50X650 FAQ
Yes, the SI50X650 is discontinued. The direct replacement is the SAI50X650, a true ISO 15552 profile cylinder with the same 50mm bore, 650mm stroke, 982N force, G1/4 port and mounting interface. It fits existing fixtures directly.
The G1/4 port feeds a 50mm bore yielding 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N push at 0.9MPa, and a 200kgf max at 1.0MPa. It operates at 30-800mm/s with 30mm adjustable cushions.
Request a Quote for the SAI50X650
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X650 replacement — usually within 7-8 hours.