This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX300SH, 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 SI63BX300SH
The AirTAC SI63 Standard Cylinder SI63BX300SH 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 SAI63BX300SH, 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 → SAI63BX300SH
- 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 SI63BX300SH
The AirTAC SI63BX300SH 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, features a SUS304 stainless steel rod (-B) for corrosion resistance, a high-temperature Viton H seal (-H) rated for 0 to 150 C, and a G3/8 port. The direct replacement is the SAI63BX300SH, which retains the exact same ISO 15552 mounting interface, bore, stroke, and output force.
The SAI upgrade introduces a two Y-shaped one-way piston seal for lower start-up pressure and longer life. The original SI magnet (-S) supports legacy CS1-B/DS1-B sensors, while the SAI family uses current AirTAC switches and adds lock variants like SAIL and BSAI absent from the SI line.
Airtac SI63 Standard Cylinder SI63BX300SH Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX300SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX300SH |
| 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 SAI63BX300SH 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 SAI63BX300SH 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 SI63BX300SH
| 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 SI63BX300SH Is Used
High-Temp Actuation
Drives mechanisms in hot environments up to 150 C using the Viton H seal, ideal for packaging heat tunnels or drying ovens.
Corrosive Material Handling
Uses the SUS304 stainless rod to push or lift parts in washdown zones and chemical processing areas without rusting.
Extended Stroke Diverting
Handles 300 mm routing or sorting tasks on production lines, requiring external guides to prevent rod bending over the long stroke.
Replacing the Airtac SI63 Standard Cylinder SI63BX300SH with the SAI63BX300SH
To replace the SI63BX300SH, order the SAI63BX300SH. Verify the ISO 15552 mounting interface, 63 mm bore, 300 mm stroke, G3/8 port, and your specific mounting accessory (LB, FA, TC, etc.). Retain the -S magnet for position sensing and the -B SUS304 rod for wet environments. Because this is a 300 mm stroke, prevent rod bending by guiding the load externally to avoid side-load forces. If sizing up or down, neighboring bores are 50 mm (982 N push @0.5 MPa) and 80 mm (2513 N push @0.5 MPa). Note that a standard cylinder does not hold load without live air; the cushion only decelerates. For load holding on air loss, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX300SH
- ✓ 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 SI63BX300SH FAQ
Yes, the SI63BX300SH is discontinued. The direct replacement is the SAI63BX300SH. It is dimensionally interchangeable per ISO 15552, matching the 63 mm bore, 300 mm stroke, G3/8 port, and mounting interface.
The G3/8 port bore delivers a push force of 1559 N and pull of 1402 N at 0.5 MPa, 2182 N push at 0.7 MPa, 2805 N at 0.9 MPa, and a theoretical max of 318 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX300SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX300SH replacement — usually within 7-8 hours.