This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX145S, 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 SI63AX145S
The AirTAC Airtac SI63 Standard Cylinder SI63AX145S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 145mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63AX145S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke145 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63AX145S
- 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 SI63AX145S
The AirTAC SI63AX145S is a discontinued double-acting ISO 15552 profile cylinder featuring a 63mm bore, 145mm stroke, and a SUS420J2 stainless steel rod. It delivers 1559 N push and 1402 N pull at 0.5 MPa, operating at 30-800 mm/s through a G3/8 port. The direct replacement is the SAI63AX145S, sharing the same interface, force, and M16x1.5 thread.
Upgrading to the SAI retains all dimensions but adds a two Y-shaped one-way piston seal for low start-up pressure. This -S model carries a piston magnet for legacy CS1-B/DS1-B sensors, while the SAI uses current AirTAC switches. Note that a plain cylinder drifts on air loss; use a pilot check valve or SAIL lock variant for holding.
Airtac SI63 Standard Cylinder SI63AX145S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX145S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX145S |
| Bore size | Ø63 mm |
| Stroke | 145 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 SAI63AX145S 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 SAI63AX145S 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 SI63AX145S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×145 | 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 SI63AX145S Is Used
Stainless Rod Clamping
Ideal for machining fixtures requiring corrosion resistance, using the SUS420J2 rod to clamp aluminum or steel parts with 1559 N of push force.
Mid-Stroke Diversion
Actuates routing gates on packaging lines, utilizing the 145mm stroke and integrated magnet for precise mid-travel position confirmation.
Replacing the Airtac SI63 Standard Cylinder SI63AX145S with the SAI63AX145S
To replace the discontinued SI63AX145S, order the SAI63AX145S. Verify your ISO 15552 mounting fixture (LB, FA, TC, etc.), the 145mm stroke, and the G3/8 port. The -A suffix specifies the SUS420J2 stainless rod for corrosion resistance, and -S confirms the magnet for position sensing. If you need more force, the 80mm bore yields 2513 N push at 0.5 MPa; if less is required, the 50mm bore provides 982 N. Remember that the standard cushion only decelerates the load near the end of stroke and does not hold position on air loss—select the SAIL or BSAI lock variant, or an external pilot check valve, if drift is unacceptable.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX145S
- ✓ 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 SI63AX145S FAQ
Yes, the SI63AX145S is discontinued. The direct replacement is the SAI63AX145S. It is dimensionally interchangeable per ISO 15552, retaining the same 63mm bore, 145mm stroke, G3/8 port, and mounting interface. The SAI simply upgrades the piston seal to two Y-shaped elements for lower start-up pressure.
This 63mm bore cylinder uses a G3/8 air port and M16x1.5 rod thread. The thrust ratings are: 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.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63AX145S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX145S replacement — usually within 7-8 hours.