This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X185S, 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 SI63 Standard Cylinder SI63X185S
The AirTAC Airtac SI63 Standard Cylinder SI63X185S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 185mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X185S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke185 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X185S
- 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 SI63 Standard Cylinder SI63X185S
The AirTAC SI63X185S is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 185mm stroke. It delivers 1559N push force at 0.5MPa via a G3/8 port. The direct replacement is the SAI63X185S, matching the exact ISO 15552 mounting interface, bore, stroke, output force and port size for seamless fixture integration.
The SAI upgrade introduces a refined piston seal featuring two Y-shaped one-way elements for extended lifespan and lower start-up pressure. For this magnet-equipped (-S) model, the legacy CS1-B/DS1-B sensors are replaced by current AirTAC switches on the SAI.
Airtac SI63 Standard Cylinder SI63X185S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X185S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X185S |
| Bore size | Ø63 mm |
| Stroke | 185 mm |
| Acting type | Double acting |
| Port size | G3/8 |
| 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 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI63X185S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø63mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 1559 N | 1402 N |
| 0.7 MPa | 2182 N | — |
| Max (@1.0 MPa) | 318 kgf | |
The SAI63X185S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI63 Standard Cylinder SI63X185S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×185 | 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 SI63 Standard Cylinder SI63X185S Is Used
Mid-Tonnage Clamping
Secures heavy workpieces during machining operations, utilizing the 1559N push force at 0.5MPa to maintain rigid positioning against cutting loads.
Package Diversion
Actuates routing gates and pushers on automated material handling lines, where the 185mm stroke provides adequate travel to redirect parcels.
Vertical Lift Stops
Controls descent and acts as a stop mechanism in vertical material lifts, safely managing loads up to the computed 79kg vertical lift threshold.
Replacing the Airtac SI63 Standard Cylinder SI63X185S with the SAI63X185S
To replace the SI63X185S, order the SAI63X185S and confirm the ISO 15552 mounting interface, 63mm bore, 185mm stroke, G3/8 port (PT/G/NPT thread options), M16x1.5 rod thread, and the -S magnet requirement. If you need more force, the neighboring 80mm bore provides 2513N push at 0.5MPa; if less is required, the 50mm bore offers 982N. Remember that a standard cylinder does not hold load without live air—the cushion only decelerates. For load holding, consider an external pilot check valve, rod lock, or the SAIL/BSAI lock variants. The SAI family also adds the SAIF self-valve option (bores 32-100).
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X185S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI63 Standard Cylinder SI63X185S FAQ
Yes, the SI63X185S is discontinued. The direct replacement is the AirTAC SAI63X185S. It is dimensionally interchangeable per ISO 15552, retaining the same 63mm bore, 185mm stroke, G3/8 port, and mounting interface to fit existing fixtures directly.
The 63mm bore features a G3/8 air port and M16x1.5 rod thread. Force output is 1559N push and 1402N pull at 0.5MPa, 2182N push at 0.7MPa, 2805N push at 0.9MPa, with a theoretical maximum of 318kgf at 1.0MPa. Operating speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X185S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X185S replacement — usually within 7-8 hours.