This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X55, 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 SI63X55
The AirTAC SI63 Standard Cylinder SI63X55 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 SAI63X55, 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 → SAI63X55
- 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 SI63X55
The AirTAC SI63X55 is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 55 mm stroke. It delivers 1559 N push force at 0.5 MPa through a G3/8 port. Because this exact SKU lacks the -S magnet suffix, it cannot accept a position sensor. The direct replacement is the SAI63X55, retaining the same interface, force, and mounting fixtures.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. If high-temperature operation is needed, Viton H seals raise the range to 150 C.
Airtac SI63 Standard Cylinder SI63X55 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X55 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X55 |
| 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 SAI63X55 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 SAI63X55 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 SI63X55
| 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 SI63X55 Is Used
Mid-Tonnage Clamping
Secures heavy workpieces during machining operations, utilizing the 1559 N push force to hold components rigidly against cutting loads.
Package Diversion
Actuates routing gates on high-speed material handling lines, providing reliable 55 mm strokes to redirect heavy cartons.
Pallet Stopper Arms
Deploys mechanical stops at conveyor transfer points to halt pallets, absorbing kinetic energy via the adjustable 30 mm air cushions.
Replacing the Airtac SI63 Standard Cylinder SI63X55 with the SAI63X55
To replace the SI63X55, order the SAI63X55 and verify your ISO 15552 mounting interface, M16x1.5 rod thread, and G3/8 port. Since this legacy SKU has no magnet, you cannot mount CS1-B or DS1-B sensors; order an SAI with the S suffix if sensing is required. Sizing both ways: a 50 mm bore yields 982 N push at 0.5 MPa, while an 80 mm bore provides 2513 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates—so use an external pilot check valve or the SAIL/BSAI lock variant for load holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X55
- ✓ 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 SI63X55 FAQ
Yes, the AirTAC SI63X55 is discontinued. The direct replacement is the SAI63X55. It is a true ISO 15552 profile cylinder that matches the 63 mm bore, 55 mm stroke, 1559 N force, G3/8 port, and original mounting hardware.
The 63 mm bore uses a G3/8 air port. At 0.5 MPa it pushes 1559 N and pulls 1402 N. At 0.7 MPa push is 2182 N, and at 0.9 MPa it is 2805 N. The theoretical maximum force is 318 kgf at 1.0 MPa.
Request a Quote for the SAI63X55
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X55 replacement — usually within 7-8 hours.