This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X400-10S, 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 SIJ125X400-10S
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X400-10S 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 SAIJ125X400-10S, 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 → SAIJ125X400-10S
- 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 SIJ125X400-10S
The AirTAC SIJ125X400-10S 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 10 mm on-site, yielding a usable 390-400 mm extension out of the 400 mm nominal maximum.
The direct replacement is the SAIJ125X400-10S, preserving the ISO 15552 mounting interface, bore, force, and adjust window. The SAIJ upgrade introduces a two Y-shaped one-way piston seal for lower start-up pressure and longer life. Remember the stop screw sets end position only; it is not a lock, so use an external rod lock for held loads.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X400-10S Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X400-10S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X400-10S |
| 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 SAIJ125X400-10S 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 SAIJ125X400-10S 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 SIJ125X400-10S
| 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 SIJ125X400-10S Is Used
Press Fit Fine-Tuning
Final insertion of large bearings where a 10 mm external stop trims the extend stroke on-site to dial in exact bottoming force without re-plumbing.
Pallet Stop Positioning
Acting as a heavy-duty stop for 125 mm bore loads, adjusting the 390-400 mm extend position by a few millimeters to accommodate varying pallet thicknesses.
Heavy Load Diverting
Diverting substantial product weights on a conveyor, using the adjustable stop to precisely set the engagement distance for different package profiles.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X400-10S with the SAIJ125X400-10S
To replace the discontinued SIJ125X400-10S, specify SAIJ125X400-10S directly—it is a direct swap retaining the 400 mm stroke, 10 mm adjust window, G1/2 port, and ISO 15552 mounting. Choose the 10 mm adjust window if you only need micro-trimming of the extend end position. Mounting options include Basic, FA, LB, and TC. The -S suffix means a piston magnet is present for legacy CS1-B/DS1-B switches (the SAIJ uses current switches). Because the 400 mm stroke is long, account for side-load and rod-bending forces by supporting the load with external guides.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X400-10S
- ✓ 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 SIJ125X400-10S FAQ
Yes, the SIJ125X400-10S is discontinued. The direct replacement is the SAIJ125X400-10S. It shares the same ISO 15552 interface, 125 mm bore, 400 mm stroke, 10 mm adjust window, G1/2 port, and mounting options, while upgrading to a two Y-shaped one-way piston seal for longer life.
The nominal 400 mm extend stroke can be shortened by up to 10 mm on-site via the external stop screw (usable 390-400 mm). The stop sets end position only and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X400-10S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X400-10S replacement — usually within 7-8 hours.