This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX400STC, 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 SI63BX400STC
The AirTAC SI63 Standard Cylinder SI63BX400STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 400mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63BX400STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke400 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63BX400STC
- 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 SI63BX400STC
The AirTAC SI63BX400STC is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore, 400mm stroke, SUS304 stainless piston rod, TC trunnion mount, and a G3/8 port. Delivering 1559N push and 1402N pull at 0.5MPa, it is replaced by the SAI63BX400STC. This direct upgrade matches the exact ISO 15552 mounting interface, bore, stroke, force, and port, fitting existing fixtures directly.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The original -S magnet supports legacy CS1-B/DS1-B sensors, while the SAI family adds SAIL and BSAI lock variants the SI lacked.
Airtac SI63 Standard Cylinder SI63BX400STC Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX400STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX400STC |
| Bore size | Ø63 mm |
| Stroke | 400 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 SAI63BX400STC 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 SAI63BX400STC 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 SI63BX400STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×400 | 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 SI63BX400STC Is Used
Stainless Rod Diverter
Ideal for pushing heavy cartons on a washdown line, utilizing the SUS304 rod for corrosion resistance and 1559N thrust at 0.5MPa.
Pallet Stopper Gate
The 400mm stroke and TC trunnion mount provide the extended reach and pivot flexibility needed to actuate pallet routing gates.
Replacing the Airtac SI63 Standard Cylinder SI63BX400STC with the SAI63BX400STC
To replace the SI63BX400STC, order the SAI63BX400STC. Verify the ISO 15552 TC trunnion mount, 400mm stroke, G3/8 port, and the -S magnet (the SAI uses current AirTAC switches, replacing legacy CS1-B/DS1-B). The -B SUS304 rod is retained for corrosion resistance. Sizing both ways: the 63mm bore yields 1559N push at 0.5MPa; neighbouring bores are 50mm (982N) and 80mm (2513N). For the 400mm stroke, use external guides to prevent rod-bending side loads. A plain cylinder drifts on air loss; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX400STC
- ✓ 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 SI63BX400STC FAQ
Yes, the SI63BX400STC is discontinued. The direct replacement is the SAI63BX400STC. It matches the ISO 15552 mounting interface, bore, stroke, force, G3/8 port, and TC mount, fitting existing fixtures perfectly.
The 63mm bore uses a G3/8 port. Force ratings are: 1559N push and 1402N pull at 0.5MPa, 2182N push at 0.7MPa, 2805N push at 0.9MPa, and a theoretical max of 318kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX400STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX400STC replacement — usually within 7-8 hours.