This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X50SN, 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 SI63X50SN
The AirTAC Airtac SI63 Standard Cylinder SI63X50SN is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 50mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X50SN, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke50 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X50SN
- 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 SI63X50SN
The AirTAC SI63X50SN is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 50mm stroke, delivering 1559N push force at 0.5MPa via a G3/8 port. It is replaced by the SAI63X50SN, a direct upgrade retaining the exact interface, bore, stroke, force and mounting. The SAI uses an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The -N suffix denotes NBR seals (-20 to +70C), and the -S suffix provides a piston magnet for legacy CS1-B/DS1-B switches.
The SAI family also introduces variants the SI lacked: SAIL for air-released locking, SAIF with a built-in 4M valve, and BSAI for clamp-locking. Note that a plain cylinder drifts on air loss; the air cushion only decelerates near stroke end, so use a lock variant or pilot check valve for held loads.
Airtac SI63 Standard Cylinder SI63X50SN Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X50SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X50SN |
| Bore size | Ø63 mm |
| Stroke | 50 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 SAI63X50SN 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 SAI63X50SN 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 SI63X50SN
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×50 | 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 SI63X50SN Is Used
Mid-Tonnage Clamping
Secures heavy workpieces during machining operations, utilizing the 1559N push force at 0.5MPa to hold components rigidly against fixture stops.
Package Diverting
Drives 50mm stroke diverting arms on sorting lines, moving boxed goods efficiently within the 30-800mm/s speed range.
Pallet Stopping
Acts as a robust end-stop for loaded pallets entering work cells, absorbing kinetic energy via the 30mm adjustable air cushions.
Replacing the Airtac SI63 Standard Cylinder SI63X50SN with the SAI63X50SN
To replace the SI63X50SN, order the SAI63X50SN to guarantee the same ISO 15552 mounting interface, 63mm bore, 50mm stroke, G3/8 port, M16x1.5 rod thread and 30mm adjustable cushion. Confirm your mounting accessory (LB, FA, CA, TC) and retain the -S magnet for current AirTAC switches, plus the -N NBR seal for -20 to +70C environments. Sizing both ways: if downgrading to a 50mm bore yields 982N push at 0.5MPa, while upgrading to an 80mm bore provides 2513N. Remember that a standard cylinder does not hold load without live air; for vertical or suspended loads, specify the SAIL or BSAI lock variant, or add an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X50SN
- ✓ 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 SI63X50SN FAQ
Yes, the SI63X50SN is discontinued. The direct replacement is the AirTAC SAI63X50SN. It is dimensionally interchangeable per ISO 15552, matching the 63mm bore, 50mm stroke, G3/8 port, output force and mounting interface, so it fits existing fixtures perfectly.
The 63mm bore features a G3/8 air port and M16x1.5 rod thread. Force output is 1559N push and 1402N pull at 0.5MPa, 2182N push at 0.7MPa, 2805N push at 0.9MPa, and a theoretical maximum of 318kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X50SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X50SN replacement — usually within 7-8 hours.