This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X253SN, 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 SI63X253SN
The AirTAC Airtac SI63 Standard Cylinder SI63X253SN is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 253mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X253SN, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke253 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X253SN
- 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 SI63X253SN
The AirTAC SI63X253SN is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 253 mm stroke. It delivers 1559 N push force at 0.5 MPa through a G3/8 port. The direct replacement is the SAI63X253SN, matching the interface, force, and mounting.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure. The -S magnet works with CS1-B/DS1-B switches, and the -N NBR seal handles -20 to +70 C.
Airtac SI63 Standard Cylinder SI63X253SN Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X253SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X253SN |
| Bore size | Ø63 mm |
| Stroke | 253 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 SAI63X253SN 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 SAI63X253SN 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 SI63X253SN
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×253 | 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 SI63X253SN Is Used
Mid-Tonnage Pressing
Applies the 1559 N push force at 0.5 MPa for seating bearings and light assembly pressing tasks in automated cells.
Package Diversion
Uses the 253 mm stroke and 79 kg vertical lift margin to actuate sorting gates and push heavy cartons off processing lines.
Pallet Stops
Deploys the 63 mm bore profile cylinder to halt pallets at workflow stations, benefiting from the adjustable end cushions.
Replacing the Airtac SI63 Standard Cylinder SI63X253SN with the SAI63X253SN
To replace the SI63X253SN, order the SAI63X253SN direct, confirming the ISO 15552 mounting interface, 63 mm bore, 253 mm nonstandard stroke, G3/8 port, and magnet. Neighbouring bores are 50 mm (982 N push at 0.5 MPa) and 80 mm (2513 N push at 0.5 MPa). Because this stroke is 253 mm, ensure guide rails to prevent rod bending under side loads. The air cushion only decelerates; for load holding on air loss, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X253SN
- ✓ 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 SI63X253SN FAQ
Yes, the AirTAC SI63X253SN is discontinued. The direct replacement is the SAI63X253SN. It is dimensionally interchangeable per ISO 15552, retaining the same 63 mm bore, 253 mm stroke, output force, G3/8 port, and mounting fixtures.
The 63 mm bore features a G3/8 port and M16x1.5 rod thread. It generates 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 maximum theoretical force of 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X253SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X253SN replacement — usually within 7-8 hours.