This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X70, 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 SI63X70
The AirTAC Airtac SI63 Standard Cylinder SI63X70 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 SAI63X70, 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 → SAI63X70
- 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 SI63X70
The AirTAC SI63X70 is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 70mm stroke. It delivers 1559N push and 1402N pull at 0.5MPa, operating at 30-800mm/s through a G3/8 port. Because this SI unit is end-of-life, you should order the direct replacement: the SAI63X70. It shares the same ISO 15552 mounting interface, bore, stroke, force, port and accessories, dropping straight into existing fixtures.
The SAI upgrade introduces an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. Note this specific SKU lacks a magnet (-S) and cannot accept a sensor. The SAI family also adds SAIL, SAIF and BSAI lock or valve variants the SI line lacked.
Airtac SI63 Standard Cylinder SI63X70 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X70 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X70 |
| 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 SAI63X70 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 SAI63X70 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 SI63X70
| 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 SI63X70 Is Used
Mid-Tonnage Clamping
Ideal for holding medium-weight workpieces during machining, using the 1559N push force at 0.5MPa to secure parts firmly.
Package Diverting
Provides reliable actuation for mid-range sorting gates and pushers on automated material handling lines.
Replacing the Airtac SI63 Standard Cylinder SI63X70 with the SAI63X70
To replace the discontinued SI63X70, order the SAI63X70. Confirm the ISO 15552 mounting interface (LB, FA, TC, etc.), the 70mm stroke, and the G3/8 port. Because this SKU has no magnet, it cannot accept legacy CS1-B/DS1-B sensors; if you need position detection, select an SAI63X70S. Size both ways: a 50mm bore yields 982N push, while an 80mm bore yields 2513N. A plain cylinder drifts on air loss—the cushion only decelerates—so for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X70
- ✓ 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 SI63X70 FAQ
Yes, the AirTAC SI63X70 is discontinued. The direct replacement is the SAI63X70. It is dimensionally interchangeable per ISO 15552, retaining the same 63mm bore, 70mm stroke, output force, G3/8 port and mounting accessories.
This double-acting cylinder features a G3/8 port and provides 1559N push / 1402N pull at 0.5MPa, 2182N push at 0.7MPa, and a theoretical maximum of 318kgf at 1.0MPa. It operates at 30-800mm/s with a 20mm rod and M16x1.5 thread.
Request a Quote for the SAI63X70
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X70 replacement — usually within 7-8 hours.