This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X340, 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 SI63X340
The AirTAC Airtac SI63 Standard Cylinder SI63X340 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 340mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X340, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke340 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X340
- 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 SI63X340
The AirTAC SI63X340 is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 340 mm stroke. It delivers 1559 N push force at 0.5 MPa through a G3/8 port. AirTAC replaced this legacy unit with the SAI63X340, a direct upgrade retaining the exact ISO 15552 mounting interface, bore, stroke, output force and port size.
The SAI upgrade features a revised piston seal using two Y-shaped one-way elements for lower start-up pressure and longer life. Note this specific SKU lacks a magnet (-S), so it cannot accept CS1-B/DS1-B sensors. For high-temperature needs, Viton H seals raise the limit to 150 C.
Airtac SI63 Standard Cylinder SI63X340 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X340 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X340 |
| Bore size | Ø63 mm |
| Stroke | 340 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 SAI63X340 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 SAI63X340 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 SI63X340
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×340 | 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 SI63X340 Is Used
Pallet Diversion
Routes heavy pallets on a packaging line using the 1559 N push force at 0.5 MPa, with adjustable cushions absorbing the kinetic energy at the 340 mm stroke end.
Clamp Actuation
Secures large workpieces in machining fixtures, requiring an external pilot check valve since the standard cushion only decelerates and cannot hold the clamp load.
Replacing the Airtac SI63 Standard Cylinder SI63X340 with the SAI63X340
To replace the discontinued SI63X340, order the SAI63X340. Confirm the ISO 15552 mounting accessory (LB foot, FA flange, TC trunnion), the G3/8 port, and the M16x1.5 rod thread. Because this SKU has no magnet, it cannot support position sensing; order an SAI63X340S if you need CS1-B/DS1-B switches. At 340 mm, add external guides to prevent rod bending under side loads. Sizing both ways: a 50 mm bore gives 982 N push, while an 80 mm bore yields 2513 N. The air cushion only decelerates the piston; it does not hold load on air loss. For static holding, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X340
- ✓ 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 SI63X340 FAQ
Yes, the SI63X340 is discontinued. The direct replacement is the AirTAC SAI63X340. It shares the identical ISO 15552 mounting interface, 63 mm bore, 340 mm stroke, output force, G3/8 port and accessories, fitting existing fixtures perfectly.
The 63 mm bore uses a G3/8 port. At 0.5 MPa it provides 1559 N push and 1402 N pull. At 0.7 MPa push is 2182 N, and at 0.9 MPa it is 2805 N. The theoretical maximum force is 318 kgf at 1.0 MPa.
Request a Quote for the SAI63X340
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X340 replacement — usually within 7-8 hours.