This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X300SLB, 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 SI63X300SLB
The AirTAC Airtac SI63 Standard Cylinder SI63X300SLB is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 300mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X300SLB, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke300 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X300SLB
- 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 SI63X300SLB
The AirTAC SI63X300SLB is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 300 mm stroke. It delivers 1559 N push force at 0.5 MPa via a G3/8 port. AirTAC replaced it with the SAI63X300SLB, a direct upgrade sharing the exact ISO 15552 mounting interface, LB foot bracket, and output force.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The -S magnet works with legacy CS1-B/DS1-B sensors, while the SAI family adds SAIL and BSAI lock variants absent in the SI line.
Airtac SI63 Standard Cylinder SI63X300SLB Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X300SLB |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X300SLB |
| Bore size | Ø63 mm |
| Stroke | 300 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 SAI63X300SLB 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 SAI63X300SLB 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 SI63X300SLB
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×300 | 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 SI63X300SLB Is Used
Material Diversion
Actuates routing gates on packaging lines, using the 1559 N push force to deflect heavy cartons reliably at speed.
Pallet Handling
Provides the extended 300 mm reach needed to push pallets or totes from lowerators onto outbound rollers.
Replacing the Airtac SI63 Standard Cylinder SI63X300SLB with the SAI63X300SLB
To replace the SI63X300SLB, order the SAI63X300SLB. It drops into existing fixtures via the ISO 15552 interface and LB foot mount, matching the 63 mm bore, 300 mm stroke, M16x1.5 rod thread, and G3/8 port. Confirm if you need PT, G, or NPT threads. The -S magnet supports CS1-B/DS1-B switches; a no-S SKU cannot take a sensor. For sizing, neighboring bores offer different forces: a 50 mm bore gives 982 N push, while an 80 mm bore gives 2513 N at 0.5 MPa. Note that a plain cylinder drifts without live air; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. Because the 300 mm stroke is long, use external guides to prevent rod bending and side-load damage.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X300SLB
- ✓ 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 SI63X300SLB FAQ
Yes, the SI63X300SLB is discontinued. The direct replacement is the SAI63X300SLB. It shares the identical ISO 15552 mounting interface, 63 mm bore, 300 mm stroke, output force, G3/8 port, and LB foot mount, fitting existing fixtures perfectly.
This 63 mm bore cylinder has a G3/8 air port. It generates 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 maximum force of 318 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X300SLB
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X300SLB replacement — usually within 7-8 hours.