This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X950SN, 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 SI63X950SN
The AirTAC Airtac SI63 Standard Cylinder SI63X950SN is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 950mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X950SN, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke950 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X950SN
- 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 SI63X950SN
The AirTAC SI63X950SN is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 950mm stroke. It delivers 1559N push force at 0.5MPa via a G3/8 port. AirTAC replaced this legacy unit with the SAI63X950SN, a direct upgrade retaining the exact interface, bore, stroke, output force, and mounting accessories.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The original SI utilized an NBR seal rated for -20 to +70C, while Viton H options raise thermal limits to 150C. This -S magnet version supports legacy CS1-B/DS1-B sensors, whereas the SAI uses current AirTAC switches.
Airtac SI63 Standard Cylinder SI63X950SN Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X950SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X950SN |
| Bore size | Ø63 mm |
| Stroke | 950 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 SAI63X950SN 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 SAI63X950SN 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 SI63X950SN
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×950 | 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 SI63X950SN Is Used
Long-Stroke Diversion
Drives large package pushers across wide conveyor belts, utilizing the 950mm stroke to redirect heavy goods into sorting lanes.
Pallet Handling
Actuates heavy pallet stops and lifting forks in automated storage systems where 1559N of thrust at 0.5MPa is required.
Material Lowering
Controls the vertical descent of material platforms, relying on adjustable air cushions to decelerate the load near stroke end.
Replacing the Airtac SI63 Standard Cylinder SI63X950SN with the SAI63X950SN
To replace the SI63X950SN, order the SAI63X950SN to guarantee the same ISO 15552 mounting interface, 63mm bore, 950mm stroke, G3/8 port, and NBR seals. Confirm your mounting accessory (LB, FA, TC, etc.) and thread option (PT, G, NPT). Because this is a 950mm stroke, you must use external guides to prevent rod bending and side-load damage. Sizing both ways: a 50mm bore yields 982N push at 0.5MPa, while an 80mm bore yields 2513N. Note that a plain cylinder drifts on air loss; the cushion only decelerates. For load holding, use an external pilot check valve or specify the SAIL or BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X950SN
- ✓ 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 SI63X950SN FAQ
Yes, the SI63X950SN is discontinued. The direct replacement is the SAI63X950SN. It is dimensionally interchangeable per ISO 15552, keeping the same 63mm bore, 950mm stroke, G3/8 port, and mounting interface.
This double-acting cylinder features a G3/8 air port. It delivers 1559N push and 1402N pull at 0.5MPa, 2182N push at 0.7MPa, 2805N push at 0.9MPa, and a theoretical maximum force of 318kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X950SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X950SN replacement — usually within 7-8 hours.