This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX400SH, 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 SI63BX400SH
The AirTAC Airtac SI63 Standard Cylinder SI63BX400SH 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 SAI63BX400SH, 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 → SAI63BX400SH
- 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 SI63BX400SH
The AirTAC SI63BX400SH is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 400 mm stroke. It delivers 1559 N push and 1402 N pull at 0.5 MPa via a G3/8 port. The direct replacement is the SAI63BX400SH, matching the interface, force, and stroke exactly. This unit features a SUS304 stainless rod and a Viton H seal for 0-150 C environments.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and longevity. The SAI family also adds SAIL, SAIF, and BSAI variants absent from the SI line.
Airtac SI63 Standard Cylinder SI63BX400SH Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX400SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX400SH |
| 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 SAI63BX400SH 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 SAI63BX400SH 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 SI63BX400SH
| 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 SI63BX400SH Is Used
Stainless Actuation
Leverages the SUS304 rod for corrosive-resistance in washdown manufacturing lines while providing 1559 N push force at 0.5 MPa.
High-Temp Diversion
Uses the Viton H seal to withstand 150 C environments, ideal for diverting hot molded parts along extended 400 mm strokes.
Replacing the Airtac SI63 Standard Cylinder SI63BX400SH with the SAI63BX400SH
To replace this SI cylinder, order the SAI63BX400SH. It is dimensionally interchangeable per the ISO 15552 mounting interface, keeping the 63 mm bore, 400 mm stroke, M16x1.5 rod thread, and G3/8 port. Retain your mounting accessory (LB, FA, TC, etc.) and the -S magnet for current AirTAC switches. If sizing up or down, neighbouring bores are 50 mm (982 N push) and 80 mm (2513 N push) at 0.5 MPa. Note that a plain cylinder drifts on air loss; the cushion only decelerates. For load holding, use an external rod lock or the SAIL/BSAI variant. Finally, at 400 mm, prevent rod bending by guiding the load externally.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX400SH
- ✓ 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 SI63BX400SH FAQ
Yes, the SI63BX400SH is discontinued. The direct replacement is the SAI63BX400SH. It is dimensionally interchangeable per ISO 15552, retaining the same bore, stroke, force, G3/8 port, and mounting interface.
It has a G3/8 port. Force ratings are 1559 N push and 1402 N pull at 0.5 MPa, 2182 N push at 0.7 MPa, 2805 N push at 0.9 MPa, and a theoretical max of 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX400SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX400SH replacement — usually within 7-8 hours.