This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X450-30S, 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 SIJ125 Double Rod Adjustable Cylinder SIJ125X450-30S
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X450-30S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 450mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X450-30S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke450 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X450-30S
- 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 SIJ125 Double Rod Adjustable Cylinder SIJ125X450-30S
The AirTAC SIJ125X450-30S is a discontinued double-acting double-rod adjustable-stroke ISO 15552 cylinder with a 125 mm bore and 450 mm nominal stroke. An external stop screw lets you trim the extend stroke by up to 30 mm on-site, yielding a usable 420-450 mm window. The direct replacement is the SAIJ125X450-30S, matching the interface, force, and mounting.
The SAIJ upgrade incorporates a two Y-shaped one-way piston seal for lower start-up pressure and longer life. The -S suffix indicates a built-in piston magnet for legacy CS1-B/DS1-B switches. Remember the stop screw sets end position only; it is not a load lock, so use an external rod lock or SAIL/BSAI variant for held loads.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X450-30S Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X450-30S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X450-30S |
| Bore size | Ø125 mm |
| Stroke | 450 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2.0 |
| 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 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAIJ125X450-30S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 kgf | |
The SAIJ125X450-30S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X450-30S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×450 | 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 SIJ125 Double Rod Adjustable Cylinder SIJ125X450-30S Is Used
Press Fit Tuning
Adjusting the extend stroke by up to 30 mm on-site allows precise press-fit depth calibration for large bearings without changing the cylinder.
Pallet Stop Calibration
Trim the extend stroke to set exact pallet stopping points on a 450 mm cycle, adapting to different pallet geometries on the fly.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X450-30S with the SAIJ125X450-30S
To replace the discontinued SIJ125X450-30S, order the exact direct replacement SAIJ125X450-30S to retain the identical ISO 15552 mounting interface, 450 mm stroke, and 30 mm adjust window. The 30 mm adjust window is ideal for fine-tuning the extend end position without machining. Mounting options include Basic, FA, LB, and TC. The -S magnet supports legacy CS1-B/DS1-B sensors. Because the stroke is 450 mm, ensure external guides mitigate side-load and rod-bending forces.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X450-30S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X450-30S FAQ
Yes, the SIJ125X450-30S is discontinued. The direct replacement is the SAIJ125X450-30S, which shares the same ISO 15552 interface, 125 mm bore, 450 mm stroke, 30 mm adjust window, and G1/2 port.
The external stop screw window is 30 mm, allowing you to trim the extend stroke from 450 mm down to 420 mm on-site.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X450-30S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X450-30S replacement — usually within 7-8 hours.