This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ63X125-75, 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 SIJ63X125-75
The AirTAC SIJ63 Double Rod Adjustable Cylinder SIJ63X125-75 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 125mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ63X125-75, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke125 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAIJ63X125-75
- 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 SIJ63X125-75
The AirTAC SIJ63X125-75 is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder. An external stop screw lets you trim the extend stroke by up to 75 mm on-site, giving a usable 50-125 mm stroke (125 mm nominal max). The direct replacement is the SAIJ63X125-75, matching the interface, force, and mounting.
The SAIJ successor retains the dimensions but uses an upgraded two Y-shaped one-way piston seal for lower start-up pressure and longer life. This non-magnet SKU cannot take a switch. The stop sets end position only; it is not a load lock, so use an external rod lock for held loads.
Airtac SIJ63 Double Rod Adjustable Cylinder SIJ63X125-75 Technical Specifications
| Model | Airtac SIJ63 Double Rod Adjustable Cylinder SIJ63X125-75 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ63X125-75 |
| Bore size | Ø63 mm |
| Stroke | 125 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 SAIJ63X125-75 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 SAIJ63X125-75 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 SIJ63X125-75
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×125 | 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 SIJ63X125-75 Is Used
Variable-depth pressing
Pin or insert pressing where the final bottom position requires on-site tuning up to 75 mm without machining a custom spacer.
Adjustable reject diverters
Diverting varied package sizes on a line, allowing operators to dial in the extend stroke from 50 to 125 mm as product formats change.
Variable-stop end locators
Acting as a hard stop for incoming pallets or workpieces, with the external screw trimming the extend position to match different fixture widths.
Replacing the Airtac SIJ63 Double Rod Adjustable Cylinder SIJ63X125-75 with the SAIJ63X125-75
To replace this discontinued SIJ63X125-75, order the exact direct replacement SAIJ63X125-75. The 75 mm adjust window is ideal if your end-position target varies by up to 75 mm. Reuse FA, LB, or TC ISO 15552 mounts. As this SKU lacks the -S magnet, it cannot accept legacy CS1-B/DS1-B sensors. Because the 125 mm stroke is under 300 mm, side-load rod deflection is minimal. The external stop sets end position but is not a lock; for load holding on air loss, specify SAIL, BSAI, or an external pilot-operated check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ63X125-75
- ✓ 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 SIJ63X125-75 FAQ
Yes, the SIJ63X125-75 is discontinued. The direct replacement is the SAIJ63X125-75. It matches the 63 mm bore, 125 mm stroke, 75 mm adjust window, G3/8 port, and ISO 15552 mounting interface, while adding an upgraded piston seal.
The external stop screw provides a 75 mm adjust window, allowing you to trim the extend stroke from the 125 mm maximum down to 50 mm. The stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ63X125-75
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ63X125-75 replacement — usually within 7-8 hours.