This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63AX275S, 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 SI63AX275S
The AirTAC SI63 Standard Cylinder SI63AX275S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 275mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63AX275S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke275 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63AX275S
- 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 SI63AX275S
The AirTAC SI63AX275S is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 275 mm stroke. Featuring a SUS420J2 stainless steel piston rod and a built-in magnet for legacy CS1-B/DS1-B switches, it delivers 1559 N of push force at 0.5 MPa through its G3/8 port. AirTAC replaced this legacy unit with the SAI63AX275S, a direct replacement sharing the exact ISO 15552 mounting interface, bore, stroke, output force, and cushion dimensions.
The SAI upgrade introduces an advanced piston seal utilizing two Y-shaped one-way elements for extended lifespan and lower start-up pressure. The broader SAI family also adds SAIL, SAIF, and BSAI lock or valve variants absent from the original SI line.
Airtac SI63 Standard Cylinder SI63AX275S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63AX275S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63AX275S |
| Bore size | Ø63 mm |
| Stroke | 275 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 SAI63AX275S 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 SAI63AX275S 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 SI63AX275S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×275 | 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 SI63AX275S Is Used
Clamping Fixtures
Secures mid-weight machined parts during milling or drilling, utilizing the 1559 N push force at 0.5 MPa for rigid holding.
Package Diverting
Actuates routing gates on 63 mm profile cylinders to redirect heavy cartons on packaging lines with reliable 30-800 mm/s speed.
Pallet Stops
Deploys a 275 mm stroke to halt pallets at workstations, with the SUS420J2 stainless rod resisting humid warehouse environments.
Replacing the Airtac SI63 Standard Cylinder SI63AX275S with the SAI63AX275S
To replace your SI63AX275S, order the SAI63AX275S and verify the ISO 15552 mounting interface, G3/8 port thread (PT/G/NPT), and your specific mounting accessory (LB, FA, TC, etc.). The -S magnet and -A SUS420J2 rod are retained. Sizing both ways: if you need more force, the 80 mm bore offers 2513 N push at 0.5 MPa; if you need less, the 50 mm bore provides 982 N. Because this is a 275 mm stroke, ensure your guide mechanism handles side loads to prevent rod bending. A plain SAI cylinder will not hold a load without live air—the cushions only decelerate. For load holding, use an external pilot check valve or explore the SAIL or BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63AX275S
- ✓ 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 SI63AX275S FAQ
Yes, the SI63AX275S is discontinued. The direct replacement is the SAI63AX275S. It is dimensionally interchangeable per ISO 15552, retaining the same 63 mm bore, 275 mm stroke, G3/8 port, and mounting interface to fit existing fixtures directly.
This 63 mm bore cylinder features a G3/8 air port and M16x1.5 rod thread. It delivers 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 SAI63AX275S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63AX275S replacement — usually within 7-8 hours.