This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X225-40S, 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 SIJ125X225-40S
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X225-40S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 225mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X225-40S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke225 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X225-40S
- 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 SIJ125X225-40S
The AirTAC SIJ125X225-40S 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 40 mm on-site, giving a usable 185-225 mm window (225 mm is the maximum). It features a 125 mm bore, G1/2 port, M27x2 rod thread, and 40 mm adjustable cushions. The direct replacement is the SAIJ125X225-40S, matching the interface, force, and mounting.
The SAIJ upgrade uses a two Y-shaped one-way piston seal for low start-up pressure. Note the stop sets end position; it is not a load lock.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X225-40S Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X225-40S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X225-40S |
| Bore size | Ø125 mm |
| Stroke | 225 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 SAIJ125X225-40S 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 SAIJ125X225-40S 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 SIJ125X225-40S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×225 | 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 SIJ125X225-40S Is Used
Press Fit Tuning
Adjusting the 40 mm extend window on-site to set precise pressing depth for bearings without swapping the entire cylinder body.
Variable Format Sealing
Trimming the extend stroke from 225 mm down to 185 mm to accommodate different carton heights in a packaging line changeover.
End-of-Stroke Positioning
Using the external stop screw to dial in the exact end position for a heavy forming operation, ensuring repeatability across tooling setups.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X225-40S with the SAIJ125X225-40S
To replace the SIJ125X225-40S, order SAIJ125X225-40S (direct identical ISO 15552 interface, 225 mm max stroke, 40 mm adjust window, G1/2 port). Choose FA, LB, or TC mounting to reuse existing holes. The -S suffix provides a piston magnet for CS1-B/DS1-B switches (SAIJ uses current switches). For strokes >=300 mm, verify side-load guidance. The stop screw sets end position only; for load holding on air loss use SAIL/BSAI or an external rod lock.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X225-40S
- ✓ 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 SIJ125X225-40S FAQ
Yes, the SIJ125X225-40S is discontinued. The direct replacement is the SAIJ125X225-40S, which shares the same ISO 15552 interface, 125 mm bore, 225 mm stroke, 40 mm adjust window, and G1/2 port. The SAIJ family also features an upgraded two Y-shaped one-way piston seal for longer life.
The external stop screw provides a 40 mm adjust window, allowing the extend stroke to be shortened on-site from the 225 mm maximum down to 185 mm. The stop sets end position only; it is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X225-40S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X225-40S replacement — usually within 7-8 hours.