This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X170SFB, 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 SI50X170SFB
The AirTAC SI50 Standard Cylinder SI50X170SFB 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 SAI50X170SFB, 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 → SAI50X170SFB
- 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 SI50X170SFB
The AirTAC SI50X170SFB is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 170 mm stroke. It delivers 982 N push force at 0.5 MPa through a G1/4 port. The direct replacement is the SAI50X170SFB, matching the bore, stroke, force, port and FB flange mounting.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. The SAI family also adds SAIL, SAIF and BSAI lock variants. Your -S magnet works with legacy CS1-B/DS1-B sensors.
Airtac SI50 Standard Cylinder SI50X170SFB Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X170SFB |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X170SFB |
| 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 SAI50X170SFB 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 SAI50X170SFB 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 SI50X170SFB
| 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 SI50X170SFB Is Used
Package Diverting
Uses the 170 mm stroke to push cartons cleanly between conveyor lanes with 982 N of thrust at 0.5 MPa.
Clamp Actuation
Secures medium workpieces during machining, leveraging the FB flange mount for rigid ISO 15552 alignment.
Pallet Stopper
Halts incoming pallets on a roller bed; the 50 kg vertical lift capacity handles heavy payload transitions safely.
Replacing the Airtac SI50 Standard Cylinder SI50X170SFB with the SAI50X170SFB
To replace the SI50X170SFB, order the SAI50X170SFB. It drops into existing fixtures via the ISO 15552 mounting interface, preserving the 50 mm bore, 170 mm stroke, G1/4 port and FB flange. If you need more force, the neighbouring 63 mm bore offers 1559 N push at 0.5 MPa; if less is required, the 40 mm bore provides 628 N. For load holding on air loss, note that a plain cylinder drifts and the cushion only decelerates. Use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. The 170 mm stroke is under 300 mm, so rod-bending side-load risks are minimal, but always guide the load.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X170SFB
- ✓ 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 SI50X170SFB FAQ
Yes, the SI50X170SFB is discontinued. The direct replacement is the SAI50X170SFB. It is dimensionally interchangeable per ISO 15552, keeping the same 50 mm bore, 170 mm stroke, G1/4 port and FB flange mount.
This double-acting cylinder uses a G1/4 port. It provides 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a theoretical maximum of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X170SFB
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X170SFB replacement — usually within 7-8 hours.