This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X400-40, 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 SIJ125X400-40
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X400-40 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 400mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X400-40, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke400 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X400-40
- 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 SIJ125X400-40
The AirTAC SIJ125X400-40 is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 125 mm bore and 400 mm maximum stroke. An external stop screw lets you trim the extend stroke by up to 40 mm on-site, giving a usable extend range of 360-400 mm. The stop sets the end position but is not a load lock. Speed is 30-500 mm/s.
The direct replacement is the SAIJ125X400-40, retaining the same ISO 15552 interface, force, adjust window, and mounting. The SAIJ family uses an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. Note this SKU lacks a magnet and cannot take a sensor; for load holding without live air, use an external rod lock or SAIL/BSAI variant.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X400-40 Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X400-40 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X400-40 |
| Bore size | Ø125 mm |
| Stroke | 400 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 SAIJ125X400-40 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 SAIJ125X400-40 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 SIJ125X400-40
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | 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 SIJ125 Double Rod Adjustable Cylinder SIJ125X400-40 Is Used
Press Fit Tuning
Allows precise on-site stroke trimming up to 40 mm to set exact press depths for bearing insertion without machining hard stops.
Diverter Gate Adjustment
Adjusts the extend stroke on packaging lines to accommodate varying package sizes, ensuring the gate meets specific routing needs.
Pallet Positioning
Fine-tunes the extend position to handle slight pallet width variations, ensuring accurate placement before stretch wrapping.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X400-40 with the SAIJ125X400-40
To replace the discontinued SIJ125X400-40, order the direct replacement SAIJ125X400-40, matching the 125 mm bore, 400 mm nominal stroke, and 40 mm adjust window. Choose the 40 mm adjust window if your extend stroke needs on-site tuning between 360 and 400 mm. Mounting reuses ISO 15552 interfaces like FA, LB, or TC. Because this SKU has no -S suffix, it cannot accept a magnetic switch. For the 400 mm stroke, use external guides to mitigate rod bending and side-load risks.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X400-40
- ✓ 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 SIJ125X400-40 FAQ
Yes, the SIJ125X400-40 is discontinued. The direct replacement is the SAIJ125X400-40, which shares the same ISO 15552 interface, 125 mm bore, 400 mm stroke, 40 mm adjust window, and G1/2 port.
The external stop screw provides a 40 mm adjust window, allowing the extend stroke to be shortened from the 400 mm maximum down to 360 mm.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X400-40
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X400-40 replacement — usually within 7-8 hours.