This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX55, 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 SI63BX55
The AirTAC Airtac SI63 Standard Cylinder SI63BX55 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 55mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63BX55, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke55 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63BX55
- 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 SI63BX55
The AirTAC SI63BX55 is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 55mm stroke. It delivers 1559N push force at 0.5MPa. The direct replacement is the SAI63BX55, matching the exact bore, stroke, G3/8 port and ISO 15552 mounting interface.
This SKU features a SUS304 stainless steel rod for corrosion resistance but lacks a magnet, meaning it cannot accept position sensors. The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure.
Airtac SI63 Standard Cylinder SI63BX55 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX55 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX55 |
| Bore size | Ø63 mm |
| Stroke | 55 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 SAI63BX55 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 SAI63BX55 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 SI63BX55
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×55 | 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 SI63BX55 Is Used
Washdown Actuation
The SUS304 stainless rod handles damp or washdown environments reliably, providing 1559N of thrust for moving medium-sized machine guards.
Short-Stroke Clamping
Delivers robust 55mm clamping actions on machining fixtures, utilizing the adjustable 30mm air cushions to soften end-of-stroke impacts.
Transfer Diverters
Powers conveyor routing gates and diverters where a non-magnetic, corrosion-resistant actuator is preferred for dusty or humid logistics lines.
Replacing the Airtac SI63 Standard Cylinder SI63BX55 with the SAI63BX55
To replace the SI63BX55, order the SAI63BX55. Verify the ISO 15552 mounting interface, 63mm bore, 55mm stroke, G3/8 port, and SUS304 rod. If you need position sensing, select an SAI variant with the -S magnet option, as this no-S SKU cannot take a switch. Sizing both ways: a 50mm bore yields 982N [email protected], while an 80mm bore yields 2513N. A plain cylinder drifts on air loss; for load holding use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX55
- ✓ 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 SI63BX55 FAQ
Yes, the SI63BX55 is discontinued. The direct replacement is the AirTAC SAI63BX55. It shares the identical ISO 15552 mounting interface, 63mm bore, 55mm stroke, G3/8 port, and output force, fitting existing fixtures perfectly.
This double-acting cylinder has a G3/8 port. It delivers 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.
Request a Quote for the SAI63BX55
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX55 replacement — usually within 7-8 hours.