This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X400-10, 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 SIJ125X400-10
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X400-10 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 SAIJ125X400-10, 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 → SAIJ125X400-10
- 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 SIJ125X400-10
The AirTAC SIJ125X400-10 is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder. An external stop screw lets you trim the extend stroke by up to 10mm on-site, giving a usable 390-400mm range; the stop sets end position and is not a load lock. The direct replacement is the SAIJ125X400-10, matching the bore, stroke, force, port, and mounting.
The SAIJ upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life, and the SAI family adds the SAIL air-released lock and BSAI clamp-lock variants the SI line lacked. This non-magnet SKU cannot take a switch; for load holding on air loss use an external rod lock, as the 40mm adjustable cushion only decelerates.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X400-10 Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X400-10 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X400-10 |
| 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 SAIJ125X400-10 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 SAIJ125X400-10 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 SIJ125X400-10
| 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 SIJ125X400-10 Is Used
Press Fit Tuning
Trimming the extend stroke by up to 10mm on-site lets operators dial in the exact 390-400mm insertion depth for press-fitting bearings without machining hard stops.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X400-10 with the SAIJ125X400-10
To replace the discontinued SIJ125X400-10, order the direct replacement SAIJ125X400-10, reusing your existing ISO 15552 FA, LB, or TC mounts. The 10mm adjust window allows precise 390-400mm extend tuning. As this SKU lacks the -S magnet, it cannot accept a magnetic switch. Because the 400mm stroke is long, account for side-load and rod-bending by using external guides to prevent premature seal wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X400-10
- ✓ 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 SIJ125X400-10 FAQ
Yes, the SIJ125X400-10 is discontinued. The direct replacement is the SAIJ125X400-10. It shares the identical ISO 15552 interface, 125mm bore, 400mm stroke, 10mm adjust window, G1/2 port, and mounting, but adds an upgraded two Y-shaped one-way piston seal for longer life and lower start-up pressure.
The external stop screw window is 10mm, allowing you to trim the extend stroke from 400mm down to 390mm on-site. The stop sets end position only; it is not a load lock, and the 40mm adjustable cushions only decelerate near stroke end.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X400-10
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X400-10 replacement — usually within 7-8 hours.