This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X235, 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 SI63X235
The AirTAC Airtac SI63 Standard Cylinder SI63X235 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 235mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X235, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke235 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X235
- 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 SI63X235
The AirTAC SI63X235 is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 235mm stroke. It delivers 1559N push force at 0.5MPa via a G3/8 port. The direct replacement is the SAI63X235, matching the interface, force and mounting exactly.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure. This non-magnet SKU cannot take a sensor, unlike CS1-B/DS1-B equipped versions.
Airtac SI63 Standard Cylinder SI63X235 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X235 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X235 |
| Bore size | Ø63 mm |
| Stroke | 235 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 SAI63X235 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 SAI63X235 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 SI63X235
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×235 | 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 SI63X235 Is Used
Clamp Actuation
Provides 1559N of push force at 0.5MPa to secure heavy workpieces in machining fixtures.
Product Diversion
Strokes 235mm to push medium-weight pallets or cartons across transfer lines at 30-800mm/s.
Replacing the Airtac SI63 Standard Cylinder SI63X235 with the SAI63X235
To replace the SI63X235, order the SAI63X235. Confirm the ISO 15552 mounting interface, the G3/8 port, and your clevis or flange accessory. Because this is a non-S SKU, it cannot accept a magnetic sensor; if sensing is needed, select an SAI63X235S. Theoretical push is 1559N at 0.5MPa; sizing down to a 50mm bore yields 982N, while a 63mm bore at 0.7MPa yields 2182N. For loads needing 235mm of travel, ensure guide rails prevent rod bending. A plain cylinder drifts on air loss; for load holding use the SAIL lock or BSAI clamp-lock variant, or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X235
- ✓ 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 SI63X235 FAQ
Yes, the SI63X235 is discontinued. The direct replacement is the SAI63X235. It is dimensionally interchangeable per ISO 15552, retaining the same 63mm bore, 235mm stroke, G3/8 port, and mounting interface.
It uses a G3/8 air port. Force output is 1559N push and 1402N pull at 0.5MPa, 2182N push at 0.7MPa, 2805N at 0.9MPa, and a maximum theoretical force of 318kgf at 1.0MPa.
Request a Quote for the SAI63X235
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X235 replacement — usually within 7-8 hours.