This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX40, 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 SI63AX40
The AirTAC Airtac SI63 Standard Cylinder SI63AX40 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 40mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63AX40, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke40 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63AX40
- 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 SI63AX40
The AirTAC SI63AX40 is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 40 mm stroke. It delivers 1559 N push force at 0.5 MPa via a G3/8 port. The direct replacement is the SAI63AX40, featuring the same ISO 15552 mounting interface, output, and dimensions. This specific SKU has a SUS420J2 stainless rod (A suffix) but lacks a magnet, so it cannot accept a position switch.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. It also adds variants the SI lacked, like the SAIL lock and BSAI clamp-lock. Note that plain cylinders drift without air; use a pilot check valve for load holding.
Airtac SI63 Standard Cylinder SI63AX40 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX40 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX40 |
| Bore size | Ø63 mm |
| Stroke | 40 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 SAI63AX40 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 SAI63AX40 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 SI63AX40
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×40 | 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 SI63AX40 Is Used
Stainless Rod Clamping
Ideal for fixture clamping in machining cells where the SUS420J2 stainless rod resists coolant corrosion and the 1559 N force secures heavy castings.
Short-Stroke Diversion
Provides robust 40 mm actuation for diverting packages or pallets on assembly lines, utilizing the 63 mm bore for high push force at low pressure.
Press Ejection
Delivers reliable ejection of formed parts from presses, taking advantage of the adjustable end cushions to decelerate the 20 mm rod smoothly.
Replacing the Airtac SI63 Standard Cylinder SI63AX40 with the SAI63AX40
To replace the SI63AX40, order the SAI63AX40 to retain the exact ISO 15552 mounting interface, 63 mm bore, 40 mm stroke, and G3/8 port. Confirm you need the SUS420J2 stainless rod option (A suffix) instead of the default carbon steel. Because this SKU lacks the S suffix, it has no magnet and cannot support CS1-B/DS1-B sensors. If sizing up or down, a 50 mm bore yields 982 N push at 0.5 MPa, while an 80 mm bore yields 2513 N. For load holding on air loss, upgrade to the SAIL or BSAI lock variant, or add an external rod lock.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX40
- ✓ 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 SI63AX40 FAQ
Yes, the AirTAC SI63AX40 is discontinued. The direct replacement is the SAI63AX40. It is dimensionally interchangeable per ISO 15552, retaining the same 63 mm bore, 40 mm stroke, G3/8 port, and mounting interface.
This double-acting cylinder uses a G3/8 port and generates 1559 N push and 1402 N pull at 0.5 MPa. At 0.7 MPa it pushes 2182 N, and at 0.9 MPa it pushes 2805 N. The theoretical maximum force is 318 kgf at 1.0 MPa.
Request a Quote for the SAI63AX40
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX40 replacement — usually within 7-8 hours.