This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X185H, 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 SI63X185H
The AirTAC SI63 Standard Cylinder SI63X185H is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 185mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X185H, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke185 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X185H
- 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 SI63X185H
The AirTAC SI63X185H is a discontinued double-acting ISO 15552 profile cylinder with a 63 mm bore and 185 mm stroke. It delivers 1559 N push force at 0.5 MPa via a G3/8 port. The direct replacement is the SAI63X185H, matching the exact interface, force, and mounting. This -H variant uses Viton seals for 0-150 C environments.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. For load holding, note that standard cylinders drift on air loss; use an external rod lock or the SAIL/BSAI lock variants. Without a -S magnet, this SKU cannot take a sensor.
Airtac SI63 Standard Cylinder SI63X185H Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X185H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X185H |
| Bore size | Ø63 mm |
| Stroke | 185 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 SAI63X185H 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 SAI63X185H 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 SI63X185H
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×185 | 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 SI63X185H Is Used
Hot Stamp Press Ejection
Ejects formed parts from 150 C hot stamping dies, utilizing the Viton -H seal to withstand ambient radiant heat while delivering 1559 N of push force.
Diverting Heavy Pallets
Actuates a diverting arm on a high-speed packaging line to reroute loaded pallets, taking advantage of the 30-800 mm/s speed range and 63 mm bore power.
Clamping Weldments
Secures steel weldments in a fabrication fixture, providing reliable clamping via the ISO 15552 mounting interface and M16x1.5 rod thread.
Replacing the Airtac SI63 Standard Cylinder SI63X185H with the SAI63X185H
To replace the SI63X185H, order the SAI63X185H. Verify the ISO 15552 mounting interface, 185 mm stroke, G3/8 port (PT/G/NPT thread options), and accessories like FA flange or TC trunnion. Because this SKU lacks the -S magnet, it cannot accept CS1-B/DS1-B sensors; order a magnet-equipped SAI if position sensing is needed. For sizing, the 63 mm bore yields 1559 N push at 0.5 MPa; if less force is required, step down to a 50 mm bore (982 N), or move up to 80 mm (2513 N) for heavier loads. At 185 mm stroke, side-load risks are low, but always ensure proper guide alignment. A plain cylinder does not hold load without air; for safety against drift, specify an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X185H
- ✓ 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 SI63X185H FAQ
Yes, the SI63X185H is discontinued. The direct replacement is the SAI63X185H. It is dimensionally interchangeable per ISO 15552, retaining the same 63 mm bore, 185 mm stroke, G3/8 port, and mounting interface. The SAI simply upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life.
The 63 mm bore features a G3/8 air port and an M16x1.5 rod thread. At 0.5 MPa it provides 1559 N push and 1402 N pull force. At 0.7 MPa push is 2182 N, and at 0.9 MPa it is 2805 N. The theoretical maximum force is 318 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X185H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X185H replacement — usually within 7-8 hours.