This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X50H, 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 SI63X50H
The AirTAC SI63 Standard Cylinder SI63X50H is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 50mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X50H, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke50 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X50H
- 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 SI63X50H
The AirTAC SI63X50H is a discontinued double-acting ISO 15552 profile cylinder featuring a 63 mm bore and 50 mm stroke. Built with an extruded aluminum barrel and adjustable air cushions at both ends, it delivers 1559 N push force at 0.5 MPa. The direct replacement is the SAI63X50H, which matches the exact bore, stroke, G3/8 port, and ISO 15552 mounting interface for seamless fixture integration.
This specific SKU lacks a magnet and cannot accept a sensor. It includes a Viton H seal, extending the operating temperature to 0-150 C. The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure.
Airtac SI63 Standard Cylinder SI63X50H Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X50H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X50H |
| Bore size | Ø63 mm |
| Stroke | 50 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 SAI63X50H 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 SAI63X50H 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 SI63X50H
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×50 | 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 SI63X50H Is Used
Hot Stamp Ejection
Uses the 1559 N push force and Viton H high-temperature seal to eject stamped parts from heated tooling up to 150 C reliably.
Divert Gate Actuation
Provides robust 50 mm travel to pivot routing gates on high-speed packaging lines, handling the dynamic loads of product redirection.
Clamp Mechanism
Secures workpieces in automated welding cells where the 63 mm bore delivers sufficient holding force without requiring continuous sensor feedback.
Replacing the Airtac SI63 Standard Cylinder SI63X50H with the SAI63X50H
To replace the SI63X50H, order the SAI63X50H and verify the ISO 15552 mounting interface, 50 mm stroke, and G3/8 port. Confirm your mounting accessory (LB, FA, TC, etc.) and note that this no-magnet SKU cannot support a sensor. For force sizing, this bore yields 1559 N push at 0.5 MPa; if undersized, the 80 mm bore offers 2513 N. 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 variants for load holding. The SAIF variant (bores 32-100) integrates a 4M valve if needed.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X50H
- ✓ 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 SI63X50H FAQ
Yes, the SI63X50H is discontinued. The direct replacement is the SAI63X50H. It is dimensionally interchangeable per ISO 15552, retaining the same 63 mm bore, 50 mm stroke, G3/8 port, and mounting interface.
This double-acting cylinder features a G3/8 air port, a 20 mm rod, and M16x1.5 thread. It delivers 1559 N push and 1402 N pull at 0.5 MPa, 2182 N push at 0.7 MPa, and a theoretical maximum force of 318 kgf at 1.0 MPa.
Request a Quote for the SAI63X50H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X50H replacement — usually within 7-8 hours.