This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X125TC, 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 SI63X125TC
The AirTAC Airtac SI63 Standard Cylinder SI63X125TC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 125mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X125TC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke125 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X125TC
- 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 SI63X125TC
The AirTAC SI63X125TC is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 125mm stroke, delivering 1559N push force at 0.5MPa. It featured a G3/8 port and TC trunnion mounting. Because this legacy series is end-of-life, you should order the direct replacement: the SAI63X125TC. It shares the same ISO 15552 mounting interface, force, and port size, fitting existing fixtures perfectly.
The SAI upgrade introduces a refined piston seal using two Y-shaped one-way elements for longer life and lower start-up pressure. Note this specific SKU lacks the -S magnet, so it cannot accept CS1-B/DS1-B sensors. For load-holding, the cushion only decelerates; explore the SAIL or BSAI lock variants.
Airtac SI63 Standard Cylinder SI63X125TC Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X125TC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X125TC |
| Bore size | Ø63 mm |
| Stroke | 125 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 SAI63X125TC 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 SAI63X125TC 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 SI63X125TC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×125 | 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 SI63X125TC Is Used
Material Diverting
Drives TC-mounted pivoting diverters on packaging lines using its 1559N push force to redirect heavy cartons reliably.
Pallet Handling
Indexes pallet stops and lifts in automated storage systems, benefiting from the 30mm adjustable air cushions at both ends.
Replacing the Airtac SI63 Standard Cylinder SI63X125TC with the SAI63X125TC
To replace the discontinued SI63X125TC, order the SAI63X125TC, confirming the TC trunnion mount, 125mm stroke, and G3/8 port. This plain SKU has no magnet and cannot support CS1-B/DS1-B switches. If sizing up, the 80mm bore offers 2513N at 0.5MPa; if sizing down, the 50mm bore provides 982N. Remember that a standard cylinder drifts without live air—the cushion only decelerates. For secure load holding, specify the SAIL air-released lock or BSAI clamp-lock variant, or add an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X125TC
- ✓ 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 SI63X125TC FAQ
Yes, the SI63X125TC is discontinued. The direct replacement is the SAI63X125TC. It is dimensionally interchangeable per ISO 15552, retaining the same 63mm bore, 125mm stroke, G3/8 port, and TC mounting interface.
This 63mm bore cylinder uses a G3/8 air port. It generates 1559N push and 1402N pull at 0.5MPa, 2182N push at 0.7MPa, 2805N at 0.9MPa, and a theoretical maximum of 318kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X125TC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X125TC replacement — usually within 7-8 hours.