This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI160X420, 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 SI160X420
The AirTAC SI160 Standard Cylinder SI160X420 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø160mm bore and 420mm stroke, G3/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI160X420, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ160 mm
- Stroke420 mm
- Port sizeG3/4
- Acting typeDouble acting
- Rod threadM36×2.0
- StatusDiscontinued → SAI160X420
- 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 SI160X420
The AirTAC SI160X420 is a discontinued double-acting ISO 15552 profile cylinder with a 160 mm bore and 420 mm stroke. Delivering 10053 N push force at 0.5 MPa, it features a 40 mm carbon steel rod, M36x2 thread, and a G3/4 port. The direct replacement is the SAI160X420, matching the exact ISO 15552 mounting interface, bore, stroke, output force, and porting for existing fixtures.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. This no-magnet SKU cannot take a sensor (legacy SI used CS1-B/DS1-B). For high heat, Viton H seals raise the temperature limit to 150 C.
Airtac SI160 Standard Cylinder SI160X420 Technical Specifications
| Model | Airtac SI160 Standard Cylinder SI160X420 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI160X420 |
| Bore size | Ø160 mm |
| Stroke | 420 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 SAI160X420 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 SAI160X420 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 SI160X420
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 160 | Bore size in mm. |
| ×420 | 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 SI160X420 Is Used
Heavy Press Stamping
Drives large metal forming presses requiring 10053 N of push force at 0.5 MPa to shape thick steel plates.
Mold Clamping Fixtures
Secures heavy injection molds using the 160 mm bore's 9425 N pull force, relying on external guides for the long stroke.
Replacing the Airtac SI160 Standard Cylinder SI160X420 with the SAI160X420
To replace this SI160X420, order the SAI160X420 keeping the identical ISO 15552 mounting interface, 420 mm stroke, G3/4 port, and mounting accessories. Because this lacks the -S magnet, it cannot accept position sensors. Sizing both ways: the neighboring 200 mm bore offers higher force, while the 125 mm bore provides less. At 0.5 MPa, this 160 mm bore yields 10053 N push and 9425 N pull. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants for load holding. With a 420 mm stroke, use external guides to prevent rod bending and side loads. The SAI family also adds the SAIF valve variant for smaller bores.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI160X420
- ✓ 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 SI160X420 FAQ
Yes, the SI160X420 is discontinued. The direct replacement is the SAI160X420. It features the same ISO 15552 mounting interface, 160 mm bore, 420 mm stroke, force, and G3/4 port, fitting existing fixtures perfectly.
The 160 mm bore uses a G3/4 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 of 2050 kgf at 1.0 MPa. Speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI160X420
Send us the quantity and destination. We confirm price, stock and lead time on the SAI160X420 replacement — usually within 7-8 hours.