This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX400, 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 SI63BX400
The AirTAC Airtac SI63 Standard Cylinder SI63BX400 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 SAI63BX400, 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 → SAI63BX400
- 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 SI63BX400
The AirTAC SI63BX400 is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 400mm stroke. It delivers 1559N push force at 0.5MPa through a G3/8 port. The direct replacement is the SAI63BX400, sharing the same interface, force, and mounting.
This SKU uses a SUS304 stainless piston rod for corrosion resistance but lacks a magnet, so it cannot take a sensor. The SAI upgrade features a two-piece Y-shaped piston seal for low start-up pressure. For load holding, use the SAIL lock variant, as cushions only decelerate.
Airtac SI63 Standard Cylinder SI63BX400 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX400 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX400 |
| 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 SAI63BX400 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 SAI63BX400 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 SI63BX400
| 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 SI63BX400 Is Used
Packaging Diverters
Actuates routing gates on washdown packaging lines, utilizing the SUS304 rod to resist moisture while providing 1559N push force at 0.5 MPa.
External Guide Actuators
Drives 400mm stroke clamping carriages where external rails absorb side loads, preventing rod bending during heavy-duty machining tasks.
Replacing the Airtac SI63 Standard Cylinder SI63BX400 with the SAI63BX400
To replace the SI63BX400, order the SAI63BX400. Verify the ISO 15552 mounting fixture, 400mm stroke, and G3/8 port. Because this is a no-S SKU, it cannot accept a CS1-B/DS1-B sensor; add -S if sensing is needed. Neighbouring bores: 50mm gives 982N [email protected], 80mm gives 2513N. Note the SUS304 rod material. For the 400mm stroke, use external guides to prevent rod bending. A plain cylinder drifts on air loss; for holding, use the SAIL lock or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX400
- ✓ 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 SI63BX400 FAQ
Yes, the SI63BX400 is discontinued. The direct replacement is the SAI63BX400. It is dimensionally interchangeable per ISO 15552, keeping the same 63mm bore, 400mm stroke, 1559N force, G3/8 port, and mounting interface.
It is a double-acting cylinder with a 63mm bore, 400mm stroke, G3/8 port, M16x1.5 rod thread, and 30-800 mm/s speed. Force ratings are: 1559N push / 1402N pull at 0.5MPa, 2182N push at 0.7MPa, 2805N push at 0.9MPa, and a 318kgf max at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX400
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX400 replacement — usually within 7-8 hours.