This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX50SH, 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 SI63BX50SH
The AirTAC Airtac SI63 Standard Cylinder SI63BX50SH is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 50mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63BX50SH, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke50 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63BX50SH
- 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 SI63BX50SH
The AirTAC SI63BX50SH is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 50 mm stroke. It delivers 1559 N push force at 0.5 MPa through a G3/8 port. This specific SKU includes a SUS304 stainless piston rod (-B) for corrosion resistance, a high-temp Viton seal (-H rated 0-150 C), and a piston magnet (-S) for legacy CS1-B/DS1-B sensors. AirTAC replaced the SI line with the SAI family.
You should order the direct replacement: SAI63BX50SH. It shares the same ISO 15552 mounting interface, 1559 N output, G3/8 port, and stroke. The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure.
Airtac SI63 Standard Cylinder SI63BX50SH Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX50SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX50SH |
| Bore size | Ø63 mm |
| Stroke | 50 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 SAI63BX50SH 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 SAI63BX50SH 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 SI63BX50SH
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×50 | 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 SI63BX50SH Is Used
Stainless Clamping
Uses the -B SUS304 rod and -H Viton seal to clamp parts reliably in high-temperature or washdown manufacturing cells.
Transfer Diverting
Provides 1559 N push at 0.5 MPa to actuate diverters on packaging lines, fitting neatly into existing ISO 15552 fixtures.
Replacing the Airtac SI63 Standard Cylinder SI63BX50SH with the SAI63BX50SH
To replace this discontinued SI63BX50SH, order the SAI63BX50SH. Confirm your ISO 15552 mounting interface (LB, FA, TC, etc.), the 50 mm stroke, G3/8 port, and the -B/-S/-H options. The SAI family also adds SAIL (air-released lock), SAIF (built-in valve), and BSAI (clamp-lock) variants the SI lacked. If sizing up or down, neighboring bores are 50 mm and 80 mm. A plain cylinder drifts on air loss because the cushion only decelerates; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI variant. The -B SUS304 rod and -H Viton seal are essential for high-temp or corrosive environments.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX50SH
- ✓ 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 SI63BX50SH FAQ
Yes, the SI63BX50SH is discontinued. The direct replacement is the SAI63BX50SH. It matches the ISO 15552 mounting interface, 63 mm bore, 50 mm stroke, force, and G3/8 port, so it drops into existing fixtures. The SAI uses an upgraded two Y-shaped one-way piston seal for longer life.
The bore is 63 mm with a G3/8 port. Forces are: 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 max of 318 kgf at 1.0 MPa. It features a M16x1.5 rod thread, 30 mm cushion, and 30-800 mm/s speed.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX50SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX50SH replacement — usually within 7-8 hours.