This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X30S, 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 SI63X30S
The AirTAC Airtac SI63 Standard Cylinder SI63X30S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 30mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X30S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke30 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X30S
- 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 SI63X30S
The AirTAC SI63X30S is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 30 mm stroke. It delivers 1559 N push force at 0.5 MPa through a G3/8 port. AirTAC replaced this legacy unit with the SAI63X30S, a direct replacement retaining the exact ISO 15552 mounting interface, M16x1.5 rod thread, and 30 mm cushion. Because the SAI features an upgraded piston seal with two Y-shaped one-way elements, it offers lower start-up pressure and longer life while matching the original output force.
The -S suffix indicates a built-in piston magnet for legacy CS1-B/DS1-B sensors. Note that a standard cylinder cannot hold a load without live air; the cushions only decelerate the piston near stroke ends. For secure load holding, consider the SAIL or BSAI lock variants, or use an external pilot check valve.
Airtac SI63 Standard Cylinder SI63X30S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X30S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X30S |
| Bore size | Ø63 mm |
| Stroke | 30 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 SAI63X30S 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 SAI63X30S 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 SI63X30S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×30 | 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 SI63X30S Is Used
Short-Stroke Clamping
Ideal for holding heavy workpieces in CNC machining fixtures where a compact 30 mm travel and 1559 N force securely lock parts in place.
Package Diverting
Provides robust actuation for routing heavy pallets or goods on a production line, utilizing the 63 mm bore's high push force within a tight 30 mm motion.
Replacing the Airtac SI63 Standard Cylinder SI63X30S with the SAI63X30S
To replace the discontinued SI63X30S, order the SAI63X30S and verify your existing fixture matches the ISO 15552 mounting interface, 63 mm bore, 30 mm stroke, G3/8 port, and M16x1.5 rod thread. The -S magnet is present for position sensing. If you need to size both ways, a 50 mm bore yields 982 N push at 0.5 MPa, while an 80 mm bore provides 2513 N. Remember that a plain double-acting cylinder drifts if air pressure is lost; the air cushion only decelerates the load. For suspended or vertical loads that must not drop, specify the SAIL air-released lock, the BSAI clamp-lock, or fit an external rod lock. The SAI family also introduces the SAIF variant with a built-in 4M valve for bores 32-100, which the SI line lacked.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X30S
- ✓ 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 SI63X30S FAQ
Yes, the SI63X30S is discontinued. The direct replacement is the AirTAC SAI63X30S. It shares the identical ISO 15552 mounting interface, 63 mm bore, 30 mm stroke, output force, G3/8 port, and accessories, fitting directly into existing fixtures.
The 63 mm bore uses a G3/8 air port. Theoretical forces are 1559 N push and 1402 N pull at 0.5 MPa, 2182 N push at 0.7 MPa, and 2805 N push at 0.9 MPa. The maximum theoretical force is 318 kgf at 1.0 MPa.
Request a Quote for the SAI63X30S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X30S replacement — usually within 7-8 hours.