This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX35, 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 SI63AX35
The AirTAC Airtac SI63 Standard Cylinder SI63AX35 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 35mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63AX35, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke35 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63AX35
- 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 SI63AX35
The AirTAC SI63AX35 is a discontinued double-acting ISO 15552 profile cylinder with a 63mm bore and 35mm stroke. It delivers 1559N push and 1402N pull at 0.5MPa, using a G3/8 port and an M16x1.5 rod thread. AirTAC replaced this legacy unit with the SAI63AX35, a direct upgrade retaining the exact ISO 15552 mounting interface, output force, and dimensions. The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life.
Because this specific SKU lacks the -S magnet suffix, it cannot accept a CS1-B or DS1-B sensor. This unit uses an SUS420J2 stainless steel rod (the -A option) for corrosion resistance. Note that a standard cylinder drifts without live air; for load holding, explore the SAIL or BSAI lock variants.
Airtac SI63 Standard Cylinder SI63AX35 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX35 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX35 |
| Bore size | Ø63 mm |
| Stroke | 35 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 SAI63AX35 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 SAI63AX35 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 SI63AX35
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×35 | 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 SI63AX35 Is Used
Stainless Rod Clamping
Ideal for short-stroke clamping tasks where the SUS420J2 rod resists moisture and the 1559N force secures parts firmly.
Transfer Line Diverting
Provides reliable 35mm actuation for diverting lightweight packages on ISO 15552-mounted machinery fixtures.
Short-Stroke Ejection
Delivers rapid 30-800mm/s ejection of manufactured parts, utilizing the adjustable 30mm air cushions at both ends.
Replacing the Airtac SI63 Standard Cylinder SI63AX35 with the SAI63AX35
To replace the discontinued SI63AX35, order the SAI63AX35. Verify your ISO 15552 mounting fixture matches, and confirm the G3/8 port, 63mm bore, 35mm stroke, and SUS420J2 stainless rod requirement. Since this SKU has no magnet (-S), you cannot mount position sensors; if sensing is needed, switch to an SAI63X35S. For force context, the 63mm bore yields 1559N push at 0.5MPa; neighbouring bores are 50mm (982N) and 80mm (2513N). A plain cylinder does not hold load without air pressure—the cushions only decelerate. If you need failsafe holding, use an external pilot check valve or specify the SAIL (air-released lock) or BSAI (clamp-lock) variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX35
- ✓ 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 SI63AX35 FAQ
Yes, the SI63AX35 is discontinued. The direct replacement is the AirTAC SAI63AX35. It shares the identical ISO 15552 mounting interface, 63mm bore, 35mm stroke, G3/8 port, and force ratings, fitting directly into existing fixtures.
The 63mm bore uses a G3/8 air port. It generates 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.
Request a Quote for the SAI63AX35
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX35 replacement — usually within 7-8 hours.