This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X61, 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 SI63X61
The AirTAC Airtac SI63 Standard Cylinder SI63X61 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 61mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X61, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke61 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X61
- 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 SI63X61
The AirTAC SI63X61 is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 61 mm stroke, delivering 1559 N push force at 0.5 MPa via a G3/8 port. As an end-of-line unit, it is superseded by the SAI63X61 direct replacement, matching the exact mounting interface, bore, stroke, force and port size.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life, while the SAI family adds SAIL, SAIF and BSAI lock variants absent from the SI line. Since this specific SKU lacks a magnet (-S), it cannot accept a CS1-B or DS1-B sensor.
Airtac SI63 Standard Cylinder SI63X61 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X61 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X61 |
| Bore size | Ø63 mm |
| Stroke | 61 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 SAI63X61 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 SAI63X61 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 SI63X61
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×61 | 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 SI63X61 Is Used
Mid-Tonnage Clamping
Secures heavy workpieces in machining fixtures, utilizing the 1559 N push force at 0.5 MPa to hold parts rigidly during milling operations.
Package Diversion
Actuates routing gates on assembly lines, where the 61 mm stroke provides quick lateral movement to sort products at high speeds.
Pallet Stopping
Controls heavy pallet flow on gravity conveyors, using adjustable end cushions to decelerate loads smoothly without rebound.
Replacing the Airtac SI63 Standard Cylinder SI63X61 with the SAI63X61
To replace the obsolete SI63X61, order the SAI63X61 direct, verifying the ISO 15552 mounting interface, G3/8 port, M16x1.5 rod thread and 30 mm cushions. If you need position feedback, select an SAI63X61S model instead, because this no-S SKU cannot fit a sensor. For sizing both ways, a 50 mm bore yields 982 N push at 0.5 MPa, while an 80 mm bore yields 2513 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for held loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X61
- ✓ 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 SI63X61 FAQ
Yes, the SI63X61 is discontinued. The direct replacement is the SAI63X61, which shares the identical ISO 15552 mounting interface, 63 mm bore, 61 mm stroke, output force and G3/8 port, fitting directly into existing fixtures.
This double-acting cylinder has a G3/8 port and 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.
Request a Quote for the SAI63X61
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X61 replacement — usually within 7-8 hours.