This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX165, 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 SI63AX165
The AirTAC Airtac SI63 Standard Cylinder SI63AX165 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 165mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63AX165, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke165 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63AX165
- 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 SI63AX165
The AirTAC SI63AX165 is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 165 mm stroke. It delivers 1559 N push force at 0.5 MPa through a G3/8 port. Because this legacy SI unit is end-of-life, you should order the direct replacement: the SAI63AX165. It shares the same ISO 15552 mounting interface, bore, stroke, force, port and accessories, fitting existing fixtures perfectly.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and long life. This specific SKU uses an SUS420J2 stainless steel rod (-A) for corrosion resistance, but lacks a magnet, so it cannot accept position sensors. Note that a standard cylinder drifts without live air; for load holding, consider the SAIL lock or BSAI clamp-lock variants.
Airtac SI63 Standard Cylinder SI63AX165 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX165 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX165 |
| Bore size | Ø63 mm |
| Stroke | 165 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 SAI63AX165 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 SAI63AX165 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 SI63AX165
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×165 | 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 SI63AX165 Is Used
Stainless Rod Clamping
Ideal for mid-force clamping tasks where moisture or coolant is present, leveraging the SUS420J2 stainless piston rod to resist corrosion on automated machining lines.
Transfer Line Diversion
Provides robust 1559 N push force at 0.5 MPa to actuate heavy diverters and gates on packaging conveyors, dropping directly into existing ISO 15552 fixture mounts.
Replacing the Airtac SI63 Standard Cylinder SI63AX165 with the SAI63AX165
To replace the discontinued SI63AX165, order the SAI63AX165, ensuring you keep the ISO 15552 mounting interface, 63 mm bore, 165 mm stroke, G3/8 port, and SUS420J2 stainless rod. Because this SKU has no magnet (-S omitted), it cannot support CS1-B or DS1-B legacy sensors; if sensing is needed, select an SAI model with the magnet option. If sizing up or down, neighboring bores are 50 mm and 80 mm. At 0.5 MPa, the 50 mm bore yields 982 N push, while the 80 mm bore yields 2513 N push. Remember that a plain double-acting cylinder does not hold load without live air; the 30 mm adjustable cushion only decelerates. For secure load holding, use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX165
- ✓ 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 SI63AX165 FAQ
Yes, the AirTAC SI63AX165 is discontinued. The direct replacement is the SAI63AX165. It is a true ISO 15552 profile cylinder that maintains the same 63 mm bore, 165 mm stroke, 1559 N force, G3/8 port, and mounting interface, fitting your existing fixtures without modification.
The 63 mm bore uses a G3/8 port and features a 20 mm rod with an M16x1.5 thread. Force output is 1559 N push and 1402 N pull at 0.5 MPa, 2182 N push at 0.7 MPa, 2805 N push at 0.9 MPa, and a theoretical maximum of 318 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63AX165
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX165 replacement — usually within 7-8 hours.