This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X340S, 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 SI63X340S
The AirTAC SI63 Standard Cylinder SI63X340S 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 SAI63X340S, 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 → SAI63X340S
- 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 SI63X340S
The AirTAC SI63X340S 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 SAI63X340S, a direct upgrade retaining the exact interface, stroke, and force.
The SAI successor features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure. The SAI family also introduces lock variants (SAIL, BSAI) absent in the SI line.
Airtac SI63 Standard Cylinder SI63X340S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X340S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X340S |
| 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 SAI63X340S 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 SAI63X340S 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 SI63X340S
| 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 SI63X340S Is Used
Transfer Line Diversion
Pushes heavy pallets laterally across a transfer belt using the 1559 N push force at 0.5 MPa, with the 340 mm stroke clearing adjacent lanes.
Pallet Lift Gate
Actuates a 340 mm lifting gate in a packaging cell, requiring the G3/8 port volume to maintain smooth 30-800 mm/s operation under load.
Replacing the Airtac SI63 Standard Cylinder SI63X340S with the SAI63X340S
To replace the SI63X340S, order the SAI63X340S. Verify the ISO 15552 mounting interface, G3/8 port, M16x1.5 rod thread, and the -S magnet for CS1-B/DS1-B sensors (the SAI uses current AirTAC switches). If sizing down, a 50 mm bore yields 982 N push at 0.5 MPa; sizing up to 80 mm provides 2513 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, specify the SAIL or BSAI lock variant. Because the 340 mm stroke exceeds 300 mm, use external guides to prevent rod bending and side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X340S
- ✓ 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 SI63X340S FAQ
Yes, the SI63X340S is discontinued. The direct replacement is the AirTAC SAI63X340S. It is dimensionally interchangeable per ISO 15552, keeping the same 63 mm bore, 340 mm stroke, G3/8 port, and mounting fixtures.
This 63 mm bore cylinder uses a G3/8 port. It generates 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.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X340S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X340S replacement — usually within 7-8 hours.