This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X65H, 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 SI50X65H
The AirTAC Airtac SI50 Standard Cylinder SI50X65H 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 SAI50X65H, 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 → SAI50X65H
- 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 SI50X65H
The AirTAC SI50X65H is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 65mm stroke. Providing 982N push force at 0.5MPa via a G1/4 port, it is replaced by the SAI50X65H. This direct successor shares identical mounting and dimensions, and features an upgraded piston seal with two Y-shaped elements for low start-up pressure. This specific SKU lacks a magnet, so it cannot accept CS1-B/DS1-B sensors. The H designation indicates a Viton seal, extending operating temperature to 0-150C.
The SAI family also introduces lock and valve variants absent in the SI line, such as the SAIL, SAIF, and BSAI models.
Airtac SI50 Standard Cylinder SI50X65H Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X65H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X65H |
| 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 SAI50X65H 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 SAI50X65H 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 SI50X65H
| 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 SI50X65H Is Used
Hot-End Part Ejection
Uses the Viton H seal to survive 150C ambient heat while ejecting molded components with 982N of thrust.
Diversion Gate Actuation
Drives a 65mm stroke routing flap on a packaging line, safely moving a 50kg vertical load.
Press Clamping
Secures workpieces at 0.7MPa yielding 1374N force, requiring an external check valve to prevent drift.
Replacing the Airtac SI50 Standard Cylinder SI50X65H with the SAI50X65H
To replace the SI50X65H, order the SAI50X65H. Confirm the ISO 15552 mounting interface, 50mm bore, 65mm stroke, G1/4 port, and M16x1.5 rod thread. Because this SKU has no -S magnet, it cannot support position sensing; if switches are needed, order a magnet-equipped SAI. The Viton H seal handles 0-150C environments. For sizing alternatives, a 40mm bore yields 628N push at 0.5MPa, while a 63mm bore offers 1559N. Note that a plain cylinder drifts without live air; 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 → SAI50X65H
- ✓ 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 SI50X65H FAQ
Yes, the SI50X65H is discontinued. The direct replacement is the SAI50X65H, which maintains the same ISO 15552 mounting interface, 50mm bore, 65mm stroke, force, and G1/4 port.
The 50mm bore uses a G1/4 port. It delivers 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N at 0.9MPa, and a theoretical max of 200kgf at 1.0MPa.
Request a Quote for the SAI50X65H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X65H replacement — usually within 7-8 hours.