This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X120TC, 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 SI63X120TC
The AirTAC Airtac SI63 Standard Cylinder SI63X120TC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 120mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X120TC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke120 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X120TC
- 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 SI63X120TC
The AirTAC SI63X120TC is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore, 120mm stroke, and TC trunnion mount. Delivering 1559N push force at 0.5MPa, it is replaced by the SAI63X120TC. This direct upgrade matches the exact G3/8 port, M16x1.5 rod thread, and mounting interface.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. Note this SKU lacks a magnet, so it cannot accept CS1-B/DS1-B sensors. For load holding, the SAIL or BSAI lock variants are required.
Airtac SI63 Standard Cylinder SI63X120TC Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X120TC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X120TC |
| Bore size | Ø63 mm |
| Stroke | 120 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 SAI63X120TC 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 SAI63X120TC 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 SI63X120TC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×120 | 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 SI63X120TC Is Used
Mid-Tonnage Clamping
Holds workpieces securely in machining fixtures using its 1559N push force at 0.5 MPa.
Package Diverting
Actuates routing gates on 120mm stroke to redirect heavy cartons along packaging lines.
Pallet Stopping
Controls pallet movement via TC trunnion mount, absorbing kinetic energy with its 30mm cushions.
Replacing the Airtac SI63 Standard Cylinder SI63X120TC with the SAI63X120TC
To replace the SI63X120TC, order the SAI63X120TC. Verify the TC trunnion mounting, 63mm bore, 120mm stroke, G3/8 port, and M16x1.5 thread. Because this specific SKU lacks the -S magnet, it cannot support position sensing; if switches are needed, select an SAI model with the magnet option and CS1-B/DS1-B equivalent sensors. For sizing, the 63mm bore yields 1559N push at 0.5MPa; dropping to a 50mm bore gives 982N, while an 80mm bore provides 2513N. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for held loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X120TC
- ✓ 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 SI63X120TC FAQ
Yes, the SI63X120TC is discontinued. The direct replacement is the SAI63X120TC. It is dimensionally interchangeable per ISO 15552, retaining the same 63mm bore, 120mm stroke, G3/8 port, and TC trunnion mounting interface.
The 63mm bore features a G3/8 port and delivers 1559N push / 1402N pull at 0.5 MPa, 2182N push at 0.7 MPa, 2805N push at 0.9 MPa, and a theoretical max of 318 kgf at 1.0 MPa. It operates at 30-800 mm/s with a 20mm rod.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X120TC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X120TC replacement — usually within 7-8 hours.