This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X450-100S, 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 SIJ125X450-100S
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X450-100S 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 SAIJ125X450-100S, 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 → SAIJ125X450-100S
- 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 SIJ125X450-100S
The AirTAC SIJ125X450-100S is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 125 mm bore and 450 mm maximum stroke. An external stop screw lets you trim the extend stroke by up to 100 mm on-site, yielding a usable 350-450 mm extension window. The direct replacement is the SAIJ125X450-100S, retaining the same interface, force, and mounting.
The SAIJ successor upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life. The stop screw strictly sets the end position; 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 SIJ125X450-100S Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X450-100S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X450-100S |
| 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 SAIJ125X450-100S 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 SAIJ125X450-100S 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 SIJ125X450-100S
| 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 SIJ125X450-100S Is Used
Press Fit Tuning
Allows on-site extend stroke trimming by up to 100 mm to dial in the exact pressing depth of bearings without swapping cylinders.
Variable Length Diverter
Adjusts the extend stop on packaging lines to accommodate changing package lengths on the fly, ensuring precise routing.
Adjustable Height Stops
Sets variable mechanical end positions for pallet loading stations, fine-tuning the 350-450 mm extension window as needed.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X450-100S with the SAIJ125X450-100S
To replace the discontinued SIJ125X450-100S, order the direct replacement SAIJ125X450-100S, which preserves the 450 mm nominal stroke, 100 mm adjust window, G1/2 port, and ISO 15552 mounting interfaces (Basic, FA, LB, TC, FTC, TCM1, TCM2). Choose the 100 mm adjust window if your final end-position needs on-site tuning between 350 and 450 mm. The -S suffix confirms a built-in piston magnet for legacy CS1-B/DS1-B switches. Because the 450 mm stroke exceeds 300 mm, verify side-load limits, rod-bending forces, and use external guides to prevent premature seal wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X450-100S
- ✓ 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 SIJ125X450-100S FAQ
Yes, the SIJ125X450-100S is discontinued. The direct replacement is the SAIJ125X450-100S. It shares the same ISO 15552 interface, 125 mm bore, 450 mm stroke, 100 mm adjust window, G1/2 port, and mounting options, while upgrading the piston seal to two Y-shaped one-way elements for longer life.
The external stop screw provides a 100 mm adjust window, allowing you to trim the extend stroke from the 450 mm maximum down to 350 mm. The stop sets end position only and does not lock the load.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X450-100S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X450-100S replacement — usually within 7-8 hours.