This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX70S, 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 SI63BX70S
The AirTAC Airtac SI63 Standard Cylinder SI63BX70S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 70mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63BX70S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke70 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63BX70S
- 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 SI63BX70S
The AirTAC SI63BX70S is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 70 mm stroke. This legacy unit delivers 1559 N push force at 0.5 MPa and features a SUS304 stainless steel piston rod (-B) for corrosion resistance, along with a built-in magnet (-S) for CS1-B/DS1-B switches. AirTAC replaced it with the SAI63BX70S, a direct sharing the same ISO 15552 mounting interface, G3/8 port, and 318 kgf max force.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. Note that a plain cylinder drifts without live air; for load holding, explore the SAIL or BSAI lock variants.
Airtac SI63 Standard Cylinder SI63BX70S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX70S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX70S |
| Bore size | Ø63 mm |
| Stroke | 70 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 SAI63BX70S 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 SAI63BX70S 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 SI63BX70S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×70 | 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 SI63BX70S Is Used
Stainless Rod Clamping
Ideal for packaging lines requiring washdown resistance, using the SUS304 rod to clamp components with 1559 N force at 0.5 MPa.
Mid-Range Diverting
Provides robust 70 mm stroke actuation to divert medium-weight goods on material handling conveyors without complex linkages.
Replacing the Airtac SI63 Standard Cylinder SI63BX70S with the SAI63BX70S
To replace the SI63BX70S, order the SAI63BX70S. Confirm the ISO 15552 mounting interface, 63 mm bore, 70 mm stroke, G3/8 port, and your mounting accessory. The -B rod is SUS304 stainless, and the -S magnet works with legacy CS1-B/DS1-B switches (the SAI uses current AirTAC switches). Sizing both ways: a 50 mm bore yields 982 N push at 0.5 MPa, while an 80 mm bore yields 2513 N. A plain cylinder does not hold load on air loss; use an external rod lock or pilot check valve, or specify the SAIL/BSAI lock variant. The 70 mm stroke keeps side-load risk low, but always guide the rod.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX70S
- ✓ 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 SI63BX70S FAQ
Yes, the SI63BX70S is discontinued. The direct replacement is the AirTAC SAI63BX70S. It shares the same ISO 15552 mounting interface, 63 mm bore, 70 mm stroke, G3/8 port, and output force, fitting existing fixtures perfectly.
The bore is 63 mm with a G3/8 air port. Force output is 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. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63BX70S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX70S replacement — usually within 7-8 hours.