This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X350-30, 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 SIJ125X350-30
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X350-30 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 350mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X350-30, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke350 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X350-30
- 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 SIJ125X350-30
The AirTAC SIJ125X350-30 is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 125 mm bore and 350 mm nominal stroke. An external stop screw lets you trim the extend stroke by up to 30 mm on-site, yielding a usable extend window of 320-350 mm. The direct replacement is the SAIJ125X350-30, matching the interface, force, and mounting.
Because this SKU lacks a -S magnet, it cannot accept a magnetic switch for position sensing. The SAIJ upgrade incorporates a two Y-shaped one-way piston seal for lower start-up pressure and longer life. The stop screw sets the end position but is not a load lock; use an external rod lock or SAIL/BSAI variant to hold loads without live air.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X350-30 Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X350-30 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X350-30 |
| Bore size | Ø125 mm |
| Stroke | 350 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 SAIJ125X350-30 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 SAIJ125X350-30 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 SIJ125X350-30
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×350 | 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 SIJ125X350-30 Is Used
Press Fit Tuning
Allows operators to dial in the exact 320-350 mm extend endpoint on-site for pressing bearings without remachining hard stops.
Variable Format Flap Folding
Accommodates different carton depths in packaging lines by trimming the extend stroke up to 30 mm to avoid crushing the material.
Adjustable End Stop Forming
Provides a tunable mechanical end position for metal forming dies where the final stroke length must be set per batch.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X350-30 with the SAIJ125X350-30
To replace the discontinued SIJ125X350-30, install the direct replacement SAIJ125X350-30, reusing your existing ISO 15552 FA, LB, or TC mounts without machining. Choose the 30 mm adjust window if your fixture needs precise 320-350 mm extend endpoint tuning. Because the 350 mm stroke is relatively long, verify side-load conditions and use external guides to prevent rod bending. Note this non-magnetic SKU cannot take a sensor.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X350-30
- ✓ 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 SIJ125X350-30 FAQ
Yes, the SIJ125X350-30 is discontinued. The direct replacement is the SAIJ125X350-30, which shares the same ISO 15552 interface, 350 mm stroke, 30 mm adjust window, G1/2 port, and mounting options. The SAIJ family also adds an upgraded two Y-shaped one-way piston seal for longer life.
The external stop screw window is 30 mm, allowing you to shorten the 350 mm extend stroke down to 320 mm. The stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X350-30
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X350-30 replacement — usually within 7-8 hours.