This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X650H, 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 SI50X650H
The AirTAC Airtac SI50 Standard Cylinder SI50X650H 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 SAI50X650H, 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 → SAI50X650H
- 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 SI50X650H
The AirTAC SI50X650H is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 650mm stroke. Delivering 982N push force at 0.5MPa, it features a G1/4 port and M16x1.5 rod thread. The direct replacement is the SAI50X650H, matching the exact interface, force, and porting.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. This -H variant specifies a Viton seal for 0-150C high-temp environments. Without a -S suffix, this SKU cannot take a magnetic sensor.
Airtac SI50 Standard Cylinder SI50X650H Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X650H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X650H |
| 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 SAI50X650H 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 SAI50X650H 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 SI50X650H
| 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 SI50X650H Is Used
Long-Stroke Diversion
Drives large packaging pop-up gates over 650mm to reroute heavy totes on high-temperature conveyor lines.
Oven Door Actuation
Opens industrial curing oven doors where the Viton -H seal survives 0-150C ambient heat and sustained cycling.
Vertical Material Lift
Hoists 50kg pallets in two-meter elevation zones using the 982N thrust, guided externally to prevent rod bending.
Replacing the Airtac SI50 Standard Cylinder SI50X650H with the SAI50X650H
To replace this SI50X650H, order the SAI50X650H. Confirm the ISO 15552 mounting interface, 50mm bore, 650mm stroke, G1/4 port, and your specific mounting accessory (LB, FA, TC, etc.). Because this SKU lacks the -S magnet, it cannot accept CS1-B/DS1-B sensors; order an SAI with -S if sensing is needed. Sizing both ways: a 40mm bore yields 628N [email protected], while a 63mm bore yields 1559N. At 650mm stroke, prevent rod bending by adding external guides to absorb side loads. Note that a plain cylinder drifts on air loss; for load holding, use an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X650H
- ✓ 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 SI50X650H FAQ
Yes, the SI50X650H is discontinued. The direct replacement is the SAI50X650H. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 650mm stroke, G1/4 port, and mounting interface.
This double-acting cylinder has a G1/4 port and provides 982N push / 825N pull at 0.5MPa, 1374N push at 0.7MPa, and a theoretical max of 200kgf at 1.0MPa. The 650mm stroke operates at 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X650H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X650H replacement — usually within 7-8 hours.