This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX160S, 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 SI50AX160S
The AirTAC Airtac SI50 Standard Cylinder SI50AX160S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 160mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50AX160S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke160 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50AX160S
- 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 SI50AX160S
The AirTAC SI50AX160S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 160mm stroke. It delivers 982 N push and 825 N pull at 0.5 MPa, operating through a G1/4 port. AirTAC replaced this legacy unit with the SAI50AX160S, a direct upgrade sharing the exact ISO 15552 mounting interface, bore, stroke, force, and port size. The replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life.
This specific unit includes the SUS420J2 stainless steel piston rod (A) and a built-in magnet (S) for legacy CS1-B/DS1-B switches. Note that a plain cylinder drifts without live air; for load holding, explore the SAIL lock or BSAI clamp-lock variants the SI line lacked.
Airtac SI50 Standard Cylinder SI50AX160S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX160S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX160S |
| Bore size | Ø50 mm |
| Stroke | 160 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 SAI50AX160S 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 SAI50AX160S 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 SI50AX160S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×160 | 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 SI50AX160S Is Used
Package Diverting
Drives diverting arms on packaging lines where the 982 N push force at 0.5 MPa easily handles standard carton weights.
Clamp Actuation
Secures workpieces during machining, using the SUS420J2 stainless rod to resist coolant splashing and corrosion.
Replacing the Airtac SI50 Standard Cylinder SI50AX160S with the SAI50AX160S
To replace the SI50AX160S, order the SAI50AX160S and confirm the ISO 15552 mounting interface, 50mm bore, 160mm stroke, G1/4 port (PT/G/NPT), and your specific mounting accessory. The SAI keeps the SUS420J2 rod and magnet for current AirTAC switches. Sizing both ways: a 40mm bore gives 628 N push at 0.5 MPa, while a 63mm bore yields 1559 N. At 160mm stroke, side-load and rod-bending risks are moderate, but always use guide rails for heavy off-center loads. Remember that cushions only decelerate; they do not hold position. If you need air-loss protection, select the SAIL (air-released lock) or BSAI (clamp-lock) variant, or add an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX160S
- ✓ 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 SI50AX160S FAQ
Yes, the SI50AX160S is discontinued. The direct replacement is the SAI50AX160S. It shares the identical ISO 15552 mounting interface, 50mm bore, 160mm stroke, output force, and G1/4 port, fitting existing fixtures perfectly while adding an upgraded piston seal.
This 50mm bore cylinder uses a G1/4 air port. The thrust ratings are 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, 1767 N push at 0.9 MPa, and a theoretical maximum of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX160S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX160S replacement — usually within 7-8 hours.