This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X420, 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 SI63X420
The AirTAC SI63 Standard Cylinder SI63X420 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 420mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X420, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke420 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X420
- 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 SI63X420
The AirTAC SI63X420 is a discontinued double-acting ISO 15552 profile cylinder, delivering a push force of 1559 N at 0.5 MPa through a 63 mm bore and 420 mm stroke. Because this legacy pneumatic component is end-of-life, AirTAC mandates the SAI63X420 as the direct replacement. It preserves the original G3/8 port, M16x1.5 rod thread, and 30 mm adjustable air cushions, dropping seamlessly into existing ISO 15552 mounting fixtures without mechanical redesign.
The SAI upgrade introduces a refined piston seal utilizing two Y-shaped one-way elements for lower start-up pressure and extended lifespan. This SKU lacks a magnet (-S), meaning it cannot accept CS1-B or DS1-B sensors. Note that a standard cylinder will drift on air loss; for load holding, explore the SAIL or BSAI lock variants.
Airtac SI63 Standard Cylinder SI63X420 Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X420 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X420 |
| Bore size | Ø63 mm |
| Stroke | 420 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 SAI63X420 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 SAI63X420 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 SI63X420
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×420 | 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 SI63X420 Is Used
Material Diversion
Actuates routing gates on package lines, using the 1559 N push force to reliably pivot heavy sorting flaps over a 420 mm travel distance.
Pallet Drop Unit
Lowers empty pallets into loading stations. The 420 mm stroke accommodates varying stack heights, though an external guide is required to prevent rod bending.
Storage Pusher
Indexes product cartons into dense storage racks. The G3/8 port ensures rapid actuation, but a pilot check valve must be added to prevent drift.
Replacing the Airtac SI63 Standard Cylinder SI63X420 with the SAI63X420
To replace the discontinued SI63X420, order the SAI63X420, verifying your ISO 15552 mounting accessory (LB, FA, CA, TC), G3/8 port thread (PT/G/NPT), and 420 mm stroke. Since this is a non-magnetized SKU, it cannot support position sensing; if switches are needed, specify the SAI63X420S. Sizing checks: the 63 mm bore yields 1559 N push at 0.5 MPa, while the neighboring 80 mm bore offers 2513 N. At 420 mm, the extended stroke necessitates an external guide to prevent rod-bending and side-load wear. A plain cylinder does not hold load without live air; use a pilot check valve or the SAIL/BSAI lock variant for secure holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X420
- ✓ 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 SI63X420 FAQ
Yes, the SI63X420 is discontinued. The direct replacement is the AirTAC SAI63X420. It features the same ISO 15552 mounting interface, 63 mm bore, 420 mm stroke, output force, G3/8 port, and 30 mm cushions, fitting existing fixtures perfectly while upgrading the piston seal.
The 63 mm bore features a G3/8 air port and delivers a push force of 1559 N and pull of 1402 N at 0.5 MPa. At 0.7 MPa push is 2182 N, and 2805 N at 0.9 MPa. The theoretical maximum force is 318 kgf at 1.0 MPa, operating at speeds of 30-800 mm/s.
Request a Quote for the SAI63X420
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X420 replacement — usually within 7-8 hours.