This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ63X400-20, 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 SIJ63 Double Rod Adjustable Cylinder SIJ63X400-20
The AirTAC SIJ63 Double Rod Adjustable Cylinder SIJ63X400-20 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 400mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ63X400-20, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke400 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAIJ63X400-20
- 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 SIJ63 Double Rod Adjustable Cylinder SIJ63X400-20
The AirTAC SIJ63X400-20 is a double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 63 mm bore and 400 mm nominal stroke. An external stop screw lets you trim the extend stroke by up to 20 mm on-site, yielding a usable extend range of 380-400 mm. The stop sets the end position but is not a load lock. This SIJ model is discontinued; the direct replacement is the SAIJ63X400-20, sharing the same interface, force, and mounting.
The SAIJ successor retains the ISO 15552 mounting interface for direct hardware reuse and upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life. Because this SKU lacks a -S magnet, it cannot accept a magnetic switch. Note that a plain cylinder drifts on air loss; for held loads use an external rod lock or the SAIL/BSAI variants.
Airtac SIJ63 Double Rod Adjustable Cylinder SIJ63X400-20 Technical Specifications
| Model | Airtac SIJ63 Double Rod Adjustable Cylinder SIJ63X400-20 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ63X400-20 |
| Bore size | Ø63 mm |
| Stroke | 400 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 SAIJ63X400-20 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 SAIJ63X400-20 produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SIJ63 Double Rod Adjustable Cylinder SIJ63X400-20
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×400 | 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 SIJ63 Double Rod Adjustable Cylinder SIJ63X400-20 Is Used
End-Position Trimming on Machining Fixtures
Allows operators to dial in the exact 380-400 mm extend reach on-site during tooling setup, avoiding the need to machine custom spacers for part variations.
Adjustable Transfer Pusher
Provides a tunable push-off distance for varying product lengths on a line, letting maintenance shorten the extend stroke by up to 20 mm without changing the cylinder.
Variable Depth Carton Forming
Sets precise forming depth for different carton sizes, using the external stop to trim the extend stroke on-site while maintaining consistent push force.
Replacing the Airtac SIJ63 Double Rod Adjustable Cylinder SIJ63X400-20 with the SAIJ63X400-20
To replace the discontinued SIJ63X400-20, order the direct replacement SAIJ63X400-20, which matches the 63 mm bore, 400 mm stroke, 20 mm adjust window, G3/8 port, and FA/LB/TC mountings. Choose the 20 mm adjust window if you need to fine-tune the extend end position by up to 20 mm on-site. Because this configuration lacks the -S suffix, it has no magnet and cannot use legacy CS1-B/DS1-B sensors. For the 400 mm stroke, use external guides to prevent rod bending and manage side loads. The external stop screw sets end position but is not a lock; for load holding without live air, use an external rod lock or pilot-operated check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ63X400-20
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SIJ63 Double Rod Adjustable Cylinder SIJ63X400-20 FAQ
Yes, the SIJ63X400-20 is discontinued. The direct replacement is the SAIJ63X400-20. It shares the same ISO 15552 interface, 63 mm bore, 400 mm stroke, 20 mm adjust window, G3/8 port, and mounting options, but features an upgraded piston seal.
The external stop screw allows you to trim the extend stroke by up to 20 mm on-site, giving a usable range of 380-400 mm. The stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ63X400-20
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ63X400-20 replacement — usually within 7-8 hours.