This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX50SN, 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 SI63AX50SN
The AirTAC Airtac SI63 Standard Cylinder SI63AX50SN 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 SAI63AX50SN, 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 → SAI63AX50SN
- 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 SI63AX50SN
The AirTAC SI63AX50SN 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 directly replaced by the SAI63AX50SN direct upgrade, which shares identical mounting and dimensions.
This SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and longevity. Your -A code specifies a SUS420J2 stainless rod, -S adds a magnet for CS1-B/DS1-B sensors, and -N denotes NBR seals.
Airtac SI63 Standard Cylinder SI63AX50SN Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX50SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX50SN |
| 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 SAI63AX50SN 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 SAI63AX50SN 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 SI63AX50SN
| 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 SI63AX50SN Is Used
Clamp Actuation
Provides reliable 1559N clamping force for mid-sized machining fixtures, utilizing the SUS420J2 stainless rod to resist coolant corrosion.
Package Diverting
Drives 50mm stroke diverting arms on packaging lines, where the NBR seals perform reliably within standard -20 to +70C operating temperatures.
Pallet Stops
Acts as a robust pneumatic stop for 79kg pallet loads, safely staying within the 935N working load threshold at 0.5MPa.
Replacing the Airtac SI63 Standard Cylinder SI63AX50SN with the SAI63AX50SN
To replace this SI63AX50SN, order the SAI63AX50SN to retain the exact ISO 15552 mounting interface, 50mm stroke, G3/8 port, and M16x1.5 rod thread. Confirm your mounting accessory (LB, FA, TC) and the -S magnet for legacy CS1-B/DS1-B switches. If you need to size up or down, neighboring bores are 50mm and 80mm; this 63mm bore yields 1559N push at 0.5MPa. Note that a plain cylinder drifts on air loss—the cushion only decelerates—so for load holding consider an external pilot check valve, or step up to the SAIL or BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX50SN
- ✓ 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 SI63AX50SN FAQ
Yes, the SI63AX50SN is discontinued. The direct replacement is the AirTAC SAI63AX50SN. It is dimensionally interchangeable per ISO 15552, maintaining the same 63mm bore, 50mm stroke, G3/8 port, and mounting interface, but features an upgraded piston seal.
This double-acting cylinder uses a G3/8 air port. The 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. It operates at speeds of 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63AX50SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX50SN replacement — usually within 7-8 hours.