This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X1650S, 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 SI63X1650S
The AirTAC Airtac SI63 Standard Cylinder SI63X1650S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 1650mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X1650S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke1650 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X1650S
- 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 SI63X1650S
The AirTAC SI63X1650S is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 1650 mm stroke. It delivers 1559 N push force at 0.5 MPa via a G3/8 port. Because 1650 mm exceeds the 1500 mm standard maximum for this bore, it is a non-standard, made-to-order length. AirTAC replaced this EOL unit with the SAI63X1650S, a direct sharing the exact ISO 15552 mounting interface, M16x1.5 rod thread, and 30 mm cushions.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The SI-SKU includes a piston magnet for legacy CS1-B/DS1-B sensors, while the SAI family also introduces lock variants (SAIL, BSAI) absent in the original SI line.
Airtac SI63 Standard Cylinder SI63X1650S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X1650S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X1650S |
| Bore size | Ø63 mm |
| Stroke | 1650 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 SAI63X1650S 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 SAI63X1650S 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 SI63X1650S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×1650 | 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 SI63X1650S Is Used
Long-Stroke Material Transfer
Pushes workpieces between distant machining stations over 1650 mm, utilizing the 1559 N thrust at 0.5 MPa to move heavy jigs along an external guide rail.
High-Reach Pallet Pushing
Acts as a lateral ejector at the end of packaging lines, using the 79 kg vertical-lift equivalent capacity to clear goods safely from conveyor edges.
Automated Assembly Extraction
Extracts long automotive or extruded components from deep fixtures, relying on the 1402 N pull force at 0.5 MPa and adjustable 30 mm end cushions for smooth deceleration.
Replacing the Airtac SI63 Standard Cylinder SI63X1650S with the SAI63X1650S
To replace this SI cylinder, order the SAI63X1650S. Verify your existing fixture matches the ISO 15552 mounting interface, 63 mm bore, 1650 mm stroke, G3/8 port, and M16x1.5 rod thread. Because 1650 mm exceeds the 1500 mm standard maximum for a 63 mm bore, expect a non-standard, made-to-order production lead time. When sizing, consider neighboring bores: a 50 mm bore yields 982 N push at 0.5 MPa, while an 80 mm bore provides 2513 N. At 0.7 MPa, this 63 mm bore outputs 2182 N. For this 1650 mm long stroke, external guides are strongly recommended to prevent rod bending and excessive side loads. A plain SI or SAI cylinder does not hold load without live air; the cushions only decelerate. For load holding on air loss, use an external pilot check valve, rod lock, or the SAIL/BSAI lock variants. The -S suffix means a magnet is present for CS1-B/DS1-B switches.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X1650S
- ✓ 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 SI63X1650S FAQ
Yes, the SI63X1650S is discontinued. The direct replacement is the AirTAC SAI63X1650S. It is dimensionally interchangeable per ISO 15552, retaining the same 63 mm bore, 1650 mm stroke, G3/8 port, and mounting accessories.
This cylinder uses a G3/8 air port. 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 theoretical maximum of 318 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X1650S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X1650S replacement — usually within 7-8 hours.