This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX40S, 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 SI63BX40S
The AirTAC Airtac SI63 Standard Cylinder SI63BX40S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 40mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63BX40S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke40 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63BX40S
- 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 SI63BX40S
The AirTAC SI63BX40S is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 40mm stroke. Delivering 1559 N push force at 0.5 MPa, it features a SUS304 stainless steel rod (-B) and a built-in magnet (-S) for CS1-B/DS1-B switches. The direct replacement is the SAI63BX40S, matching the G3/8 port, M16x1.5 thread, and ISO 15552 mounting interface.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. Note that plain cylinders drift without live air; for load holding, explore the SAIL or BSAI lock variants.
Airtac SI63 Standard Cylinder SI63BX40S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX40S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX40S |
| Bore size | Ø63 mm |
| Stroke | 40 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 SAI63BX40S 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 SAI63BX40S 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 SI63BX40S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×40 | 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 SI63BX40S Is Used
Stainless Rod Clamping
Ideal for food-grade or washdown clamping stations where the SUS304 rod resists moisture and the 1559 N force secures heavy parts.
Short-Stroke Diverter
The 40mm stroke provides rapid actuation for routing packages on a conveyor line, offering a safe 935 N working load at 0.5 MPa.
Corrosive Environment Ejector
Ejecting machined or washed parts from a fixture, leveraging the 30-800 mm/s speed and stainless piston rod for reliable ejection.
Replacing the Airtac SI63 Standard Cylinder SI63BX40S with the SAI63BX40S
To replace the SI63BX40S, order the SAI63BX40S. Verify the ISO 15552 mounting interface, 63mm bore, 40mm stroke, G3/8 port, and the -S magnet for legacy CS1-B/DS1-B sensors (the SAI uses current AirTAC switches). The -B code denotes a SUS304 stainless rod for corrosion resistance. Sizing both ways: a 50mm bore yields 982 N [email protected], while an 80mm bore yields 2513 N. A plain cylinder does not hold load without air; use an external rod lock or pilot check valve, or specify the SAIL/BSAI lock variant. The 40mm stroke is short, so side-load risks are minimal, but always ensure rigid guidance.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX40S
- ✓ 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 SI63BX40S FAQ
Yes, the AirTAC SI63BX40S is discontinued. The direct replacement is the SAI63BX40S. It shares the identical ISO 15552 mounting interface, 63mm bore, 40mm stroke, G3/8 port, and output force, fitting existing fixtures perfectly.
The 63mm bore features a G3/8 air port and M16x1.5 rod thread. 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; with a theoretical max of 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX40S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX40S replacement — usually within 7-8 hours.