This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI160BX550S, 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 SI160 Standard Cylinder SI160BX550S
The AirTAC SI160 Standard Cylinder SI160BX550S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø160mm bore and 550mm stroke, G3/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI160BX550S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ160 mm
- Stroke550 mm
- Port sizeG3/4
- Acting typeDouble acting
- Rod threadM36×2.0
- StatusDiscontinued → SAI160BX550S
- 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 SI160 Standard Cylinder SI160BX550S
The AirTAC SI160BX550S is a discontinued double-acting ISO 15552 profile cylinder with a 160 mm bore and 550 mm stroke. It delivers 10053 N push force at 0.5 MPa, uses a G3/4 air port, and features a SUS304 stainless steel piston rod (B option) for corrosion resistance alongside a built-in magnet (S).
You should order the SAI160BX550S as the direct replacement. It shares the same ISO 15552 mounting interface, force, and port, but upgrades to a two Y-shaped one-way piston seal for lower start-up pressure. The SAI family also adds SAIL and BSAI lock variants the SI lacked.
Airtac SI160 Standard Cylinder SI160BX550S Technical Specifications
| Model | Airtac SI160 Standard Cylinder SI160BX550S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI160BX550S |
| Bore size | Ø160 mm |
| Stroke | 550 mm |
| Acting type | Double acting |
| Port size | G3/4 |
| Rod thread | M36×2.0 |
| 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 – 500 mm/s |
| Cushion | Adjustable, 50 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI160BX550S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø160mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 10053 N | 9425 N |
| 0.7 MPa | 14074 N | — |
| Max (@1.0 MPa) | 2050 kgf | |
The SAI160BX550S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI160 Standard Cylinder SI160BX550S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 160 | Bore size in mm. |
| ×550 | 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 SI160 Standard Cylinder SI160BX550S Is Used
Heavy Press Actuation
Drives large stamping or forming presses where the 14074 N push at 0.7 MPa and 550 mm travel are required to cycle heavy tooling.
Large Material Ejection
Ejects bulky fabricated parts from machinery beds, utilizing the 50 mm adjustable air cushions to decelerate the 160 mm bore at stroke ends.
Replacing the Airtac SI160 Standard Cylinder SI160BX550S with the SAI160BX550S
To replace this SI cylinder, specify the SAI160BX550S and verify your ISO 15552 mounting interface, G3/4 port, and the -BS magnet requirement. The 550 mm stroke is substantial; always use external guides to prevent rod-bending and side-load damage. For sizing down, a 125 mm bore yields 6136 N push at 0.5 MPa. For higher force, a 200 mm bore provides 15708 N. Remember this plain cylinder will drift on air loss—the cushion only decelerates. For load holding, use an external pilot check valve or switch to the SAIL/BSAI lock variant. The -B rod is SUS304 stainless; Viton H seals raise operating temp to 150 C.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI160BX550S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI160 Standard Cylinder SI160BX550S FAQ
Yes, the SI160BX550S is discontinued. The direct replacement is the SAI160BX550S. It shares the same ISO 15552 mounting interface, 160 mm bore, 550 mm stroke, force, and G3/4 port, but features an upgraded two Y-shaped one-way piston seal for longer life.
This double-acting cylinder uses a G3/4 air port. It delivers 10053 N push and 9425 N pull at 0.5 MPa, 14074 N push at 0.7 MPa, 18095 N push at 0.9 MPa, and a theoretical max force of 2050 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI160BX550S
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