This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X400-30S, 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 SIJ125X400-30S
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X400-30S 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 SAIJ125X400-30S, 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 → SAIJ125X400-30S
- 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 SIJ125X400-30S
The AirTAC SIJ125X400-30S is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder. The external stop screw lets you trim the extend stroke by up to 30mm on-site, yielding a usable 370-400mm range. The direct replacement is the SAIJ125X400-30S, retaining the same mounting interface and force.
The SAIJ upgrade features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The -S suffix provides a piston magnet for legacy CS1-B/DS1-B switches. Remember the stop screw sets end position only; it is not a load lock.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X400-30S Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X400-30S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X400-30S |
| 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 SAIJ125X400-30S 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 SAIJ125X400-30S 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 SIJ125X400-30S
| 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 SIJ125X400-30S Is Used
Press Fit Tuning
Final press depth requires on-site adjustment within a 30mm window to compensate for material variance without re-engineering the fixture.
Pallet Diverter
A diverter arm needs precise extend endpoints to route varying pallet widths, using the stop screw to trim the 400mm stroke accurately.
Stacking Height Calibration
Adjusting the final stacking position in a packaging line by up to 30mm to accommodate fluctuating package thicknesses on the fly.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X400-30S with the SAIJ125X400-30S
To replace the discontinued SIJ125X400-30S, order the direct replacement SAIJ125X400-30S, which preserves the G1/2 port, M27x2 thread, and 40mm cushion. The 30mm adjust window is ideal for final positioning without machining. Mounting options include FA, LB, and TC. The -S magnet supports legacy CS1-B/DS1-B sensors. For the 400mm stroke, use external guides to prevent rod bending and manage side loads. For load holding on air loss, use an external rod lock or SAIL/BSAI variant, as the stop screw is not a brake.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X400-30S
- ✓ 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 SIJ125X400-30S FAQ
Yes, the SIJ125X400-30S is discontinued. The direct replacement is the SAIJ125X400-30S. It shares the identical ISO 15552 interface, 125mm bore, 400mm stroke, 30mm adjust window, G1/2 port, and mounting options. The SAIJ family also uses an upgraded piston seal for longer life.
The external stop screw allows trimming the extend stroke by up to 30mm on-site, giving a usable range of 370-400mm. The stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X400-30S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X400-30S replacement — usually within 7-8 hours.