This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X900LB, 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 SI63X900LB
The AirTAC Airtac SI63 Standard Cylinder SI63X900LB is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 900mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X900LB, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke900 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X900LB
- 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 SI63X900LB
The AirTAC SI63X900LB is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 900mm stroke. It delivers 1559N push and 1402N pull at 0.5MPa via a G3/8 port. The direct replacement is the SAI63X900LB, which shares the identical interface, force, and LB foot mounting.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. Note this SKU lacks a magnet (-S), so it cannot accept CS1-B/DS1-B sensors. For high heat, Viton H seals raise the limit to 150C.
Airtac SI63 Standard Cylinder SI63X900LB Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X900LB |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X900LB |
| Bore size | Ø63 mm |
| Stroke | 900 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 SAI63X900LB 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 SAI63X900LB 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 SI63X900LB
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×900 | 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 SI63X900LB Is Used
Long-Stroke Material Transfer
Pushes heavy pallets along a 900mm conveyor segment using 1559N of thrust at 0.5MPa, requiring external guides to prevent rod bending.
Pallet Foot Assembly Press
Actuates an LB-mounted fixture to press fasteners into pallet feet, taking advantage of the 1402N pull force at 0.5MPa.
Vertical Lowering Mechanism
Lowers a 79kg load over 900mm of travel; requires an external pilot check valve to hold the load safely if air pressure drops.
Replacing the Airtac SI63 Standard Cylinder SI63X900LB with the SAI63X900LB
To replace the SI63X900LB, order the SAI63X900LB and confirm the ISO 15552 dimensions, 63mm bore, 900mm stroke, G3/8 port (PT/G/NPT thread), and LB foot mount. Because this lacks the -S magnet, it cannot support position sensing; if needed, order the SAI with an S suffix. Sizing both ways: a 50mm bore gives 982N push, while an 80mm bore gives 2513N at 0.5MPa. A plain cylinder drifts on air loss—the cushion only decelerates—so for load holding use an external pilot check valve or the SAIL/BSAI lock variant. At 900mm stroke, use external guides to prevent rod bending and side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X900LB
- ✓ 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 SI63X900LB FAQ
Yes, the SI63X900LB is discontinued. The direct replacement is the SAI63X900LB. It is dimensionally interchangeable per ISO 15552, keeping the same 63mm bore, 900mm stroke, G3/8 port, force, and LB foot mounting.
At 0.5MPa it provides 1559N push and 1402N pull. At 0.7MPa push is 2182N, and at 0.9MPa it is 2805N. The theoretical max force is 318kgf at 1.0MPa. Operating speed is 30-800mm/s, and the G3/8 port and M16x1.5 rod thread are fixed by the 63mm bore.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X900LB
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X900LB replacement — usually within 7-8 hours.