This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX170, 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 SI50AX170
The AirTAC Airtac SI50 Standard Cylinder SI50AX170 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 SAI50AX170, 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 → SAI50AX170
- 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 SI50AX170
The AirTAC SI50AX170 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 170mm stroke. Delivering 982N push force at 0.5MPa via a G1/4 port, it is directly replaced by the SAI50AX170. This direct upgrade shares the exact ISO 15552 mounting interface, bore, stroke, force, port and mounting accessories.
The SAI upgrade features an improved piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The -A suffix denotes a SUS420J2 stainless piston rod for corrosion resistance. Note this SKU lacks a magnet, so it cannot take a sensor.
Airtac SI50 Standard Cylinder SI50AX170 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX170 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX170 |
| 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 SAI50AX170 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 SAI50AX170 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 SI50AX170
| 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 SI50AX170 Is Used
Package Diversion
Actuates routing gates on packaging lines where the 50mm bore provides sufficient push force to deflect parcels without overshocking the mechanism.
Clamp Actuation
Secures mild steel workpieces in machining fixtures, using the SUS420J2 stainless rod to resist coolant spray and shop floor moisture.
Replacing the Airtac SI50 Standard Cylinder SI50AX170 with the SAI50AX170
To replace the SI50AX170, order the SAI50AX170. Verify the ISO 15552 mounting interface, 170mm stroke, G1/4 port (PT/G/NPT thread options) and mounting accessory. This non-magnet SKU cannot accept a CS1-B/DS1-B sensor. For sizing, the 50mm bore yields 982N push at 0.5MPa; step down to 40mm for 628N or up to 63mm for 1559N. A plain cylinder drifts on air loss—the cushion only decelerates—so use a pilot check valve or SAIL/BSAI lock variant to hold loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX170
- ✓ 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 SI50AX170 FAQ
Yes, the SI50AX170 is discontinued. The direct replacement is the SAI50AX170. It is dimensionally interchangeable per ISO 15552, matching the 50mm bore, 170mm stroke, 982N force, G1/4 port, and mounting interface.
It features a G1/4 port. The force output is 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, and 1767N push at 0.9MPa. The theoretical maximum force is 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX170
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX170 replacement — usually within 7-8 hours.