This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63BX70, 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 SI63BX70
The AirTAC Airtac SI63 Standard Cylinder SI63BX70 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 SAI63BX70, 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 → SAI63BX70
- 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 SI63BX70
The AirTAC SI63BX70 is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore, 70 mm stroke, and a SUS304 stainless steel piston rod. Delivering 1559 N push force at 0.5 MPa, it is superseded by the SAI63BX70 direct replacement. This upgrade shares the exact ISO 15552 mounting interface, G3/8 port, and M16x1.5 rod thread, dropping directly into existing fixtures.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. Note this specific SKU lacks a magnet and cannot accept a sensor; the legacy SI family used CS1-B/DS1-B switches. For load-holding on air loss, explore the SAIL or BSAI lock variants, as standard cushions only decelerate.
Airtac SI63 Standard Cylinder SI63BX70 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63BX70 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63BX70 |
| 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 SAI63BX70 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 SAI63BX70 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 SI63BX70
| 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 SI63BX70 Is Used
Stainless Rod Clamping
Ideal for packaging machinery requiring corrosion resistance, using the SUS304 rod to clamp components securely with 1559 N of force.
Mid-Range Diverting
Provides robust actuation for diverting products on 63 mm bore conveyor lines where a 70 mm stroke pushes packages efficiently.
Replacing the Airtac SI63 Standard Cylinder SI63BX70 with the SAI63BX70
To replace the discontinued SI63BX70, order the SAI63BX70. Verify your existing ISO 15552 mounting accessories (LB, FA, TC, etc.), the G3/8 air port, and the M16x1.5 rod thread. Because this SKU has no magnet (-S), it cannot support position sensing; if switches are needed, select an SAI model with the magnet option. For sizing alternatives, neighbouring bores are 50 mm (982 N push @0.5 MPa) and 80 mm (2513 N push @0.5 MPa). Remember that a standard cylinder drifts without live air; for load holding, use an external pilot check valve or the SAIL/BSAI lock variants. The cushion only decelerates the load near stroke end.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63BX70
- ✓ 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 SI63BX70 FAQ
Yes, the SI63BX70 is discontinued. The direct replacement is the SAI63BX70. 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 63 mm bore features a G3/8 air port and an M16x1.5 rod thread. It delivers 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 of 318 kgf at 1.0 MPa.
Request a Quote for the SAI63BX70
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63BX70 replacement — usually within 7-8 hours.