This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX65S, 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 SI63AX65S
The AirTAC Airtac SI63 Standard Cylinder SI63AX65S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 65mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63AX65S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke65 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63AX65S
- 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 SI63AX65S
The AirTAC SI63AX65S is a discontinued double-acting ISO 15552 profile cylinder featuring a 63mm bore and 65mm stroke. It delivers a push force of 1559 N at 0.5 MPa. The direct replacement is the SAI63AX65S, which retains the same interface, bore, stroke, force, G3/8 port, and mounting. This model includes a SUS420J2 stainless piston rod (-A) and a piston magnet (-S) for CS1-B/DS1-B switches.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. Note that a plain cylinder drifts on air loss; the cushion only decelerates. For held loads, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants.
Airtac SI63 Standard Cylinder SI63AX65S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX65S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX65S |
| Bore size | Ø63 mm |
| Stroke | 65 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 SAI63AX65S 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 SAI63AX65S 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 SI63AX65S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×65 | 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 SI63AX65S Is Used
Clamp Actuation
Securing heavy machining fixtures with 1559 N of push force, utilizing the SUS420J2 stainless rod for corrosion resistance in coolant environments.
Package Diversion
Driving 65mm stroke diverters on packaging lines where the 79 kg vertical lift capacity easily handles product transfer gates.
Pallet Stops
Actuating heavy-duty pallet stops in automated storage systems, relying on the G3/8 port for rapid 30-800 mm/s cycling.
Replacing the Airtac SI63 Standard Cylinder SI63AX65S with the SAI63AX65S
To replace the SI63AX65S, order the SAI63AX65S. Verify the ISO 15552 mounting dimensions, 63mm bore, 65mm stroke, G3/8 port (PT/G/NPT thread), and mounting accessories. The -S magnet and -A SUS420J2 rod are retained. Sizing both ways: a 50mm bore yields 982 N push at 0.5 MPa, while an 80mm bore yields 2513 N. If your stroke was 300mm or longer, add a guide to prevent rod bending. For load holding on air loss, select the SAIL or BSAI lock variant, or an external pilot check valve, as standard cushions only decelerate.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX65S
- ✓ 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 SI63AX65S FAQ
Yes, the SI63AX65S is discontinued. The direct replacement is the SAI63AX65S. It is dimensionally interchangeable per ISO 15552, keeping the same 63mm bore, 65mm stroke, G3/8 port, and mounting fixtures.
This 63mm bore double-acting cylinder features a G3/8 air port and M16x1.5 rod thread. It delivers 1559 N push and 1402 N pull at 0.5 MPa, 2182 N push at 0.7 MPa, 2805 N at 0.9 MPa, and a maximum theoretical force of 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63AX65S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX65S replacement — usually within 7-8 hours.