This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X170H, 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 SI50X170H
The AirTAC Airtac SI50 Standard Cylinder SI50X170H is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 170mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X170H, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke170 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X170H
- 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 SI50X170H
The AirTAC SI50X170H is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 170mm stroke. Built for high-temperature service with a Viton H seal (0-150 C), it delivers 982 N push force at 0.5 MPa through a G1/4 port. As this SKU lacks a magnet, it cannot accept a magnetic sensor.
AirTAC replaced the SI line with the SAI50X170H, a direct replacement sharing the exact ISO 15552 mounting interface, M16x1.5 rod thread, and 30mm cushions. The SAI features an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure.
Airtac SI50 Standard Cylinder SI50X170H Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X170H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X170H |
| Bore size | Ø50 mm |
| Stroke | 170 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 SAI50X170H 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 SAI50X170H 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 SI50X170H
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×170 | 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 SI50X170H Is Used
Hot-End Ejection
Ideal for pushing parts out of heated molds using the Viton H seal to withstand 150 C ambient temperatures.
Diversion Gate
Actuating routing flaps on thermal packaging lines where the 982 N force easily overcomes flap friction.
Pallet Stopping
Deploys a 170mm stroke stop block to halt empty pallets before a high-temp shrink-wrap station.
Replacing the Airtac SI50 Standard Cylinder SI50X170H with the SAI50X170H
To replace the SI50X170H, order the SAI50X170H. Verify your ISO 15552 mounting accessory (LB, FA, TC, etc.), the G1/4 air port, and the Viton H high-temperature seal requirement. Because this specific SKU has no magnet, you cannot mount CS1-B/DS1-B sensors; if position detection is needed, switch to an SAI50X170HS equivalent. Sizing both ways: the 50mm bore yields 982 N push at 0.5 MPa, while the neighboring 40mm bore provides 628 N. Note that a standard cylinder drifts without live air—the cushion only decelerates end-of-stroke. For load holding, use an external pilot check valve or the SAIL/BSAI lock variants. At 170mm stroke, side-load risks are low, but ensure rigid rod alignment to prevent seal wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X170H
- ✓ 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 SI50X170H FAQ
Yes, the SI50X170H is discontinued. The direct replacement is the SAI50X170H. It shares the exact ISO 15552 mounting interface, 50mm bore, 170mm stroke, G1/4 port, and output force, fitting existing fixtures perfectly while adding an upgraded piston seal.
The G1/4 port supplies a 50mm bore yielding 982 N push and 825 N pull at 0.5 MPa. At 0.7 MPa push is 1374 N, and 1767 N at 0.9 MPa. The theoretical maximum force is 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X170H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X170H replacement — usually within 7-8 hours.