This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X400-40S, 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 SIJ125X400-40S
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X400-40S 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 SAIJ125X400-40S, 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 → SAIJ125X400-40S
- 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 SIJ125X400-40S
The AirTAC SIJ125X400-40S is a 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. This SIJ125X400-40S is discontinued; the direct replacement is the SAIJ125X400-40S, matching the interface, force, and mounting.
The SAIJ upgrade utilizes an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The -S suffix denotes a built-in piston magnet for legacy CS1-B/DS1-B switches. 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 SIJ125X400-40S Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X400-40S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X400-40S |
| 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 SAIJ125X400-40S 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 SAIJ125X400-40S 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 SIJ125X400-40S
| 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 SIJ125X400-40S Is Used
Press Fit Tuning
Final press depth requires field stroke tuning; trim the extend stroke by up to 40 mm on-site to set exact insertion positions without swapping cylinders.
Divert Stop Adjustment
Product diverters needing variable stop points benefit from the 360-400 mm usable extend range to handle changing package sizes on the line.
Pallet Positioning
End-of-stroke positioning for varied pallet widths can be dialed in precisely using the external stop screw on this 125 mm bore cylinder.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X400-40S with the SAIJ125X400-40S
To replace the discontinued SIJ125X400-40S, order the direct replacement SAIJ125X400-40S, keeping the 125 mm bore, 400 mm stroke, 40 mm adjust window, G1/2 port, and -S magnet. Choose the 40 mm adjust window if your extend stroke needs field tuning between 360-400 mm; otherwise, a fixed SAI is simpler. Mounting options include Basic, FA, LB, and TC. Because the stroke is 400 mm, ensure external guides to prevent rod bending under side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X400-40S
- ✓ 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 SIJ125X400-40S FAQ
Yes, the SIJ125X400-40S is discontinued. The direct replacement is the SAIJ125X400-40S. It shares the same ISO 15552 interface, 125 mm bore, 400 mm stroke, 40 mm adjust window, G1/2 port, and mounting, but uses an upgraded piston seal.
The external stop screw provides a 40 mm adjust window, allowing the extend stroke to be shortened from 400 mm down to 360 mm on-site.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X400-40S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X400-40S replacement — usually within 7-8 hours.