This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X40-30S, 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 SIJ125X40-30S
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X40-30S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 40mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X40-30S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke40 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X40-30S
- 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 SIJ125X40-30S
The AirTAC SIJ125X40-30S is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder featuring a 125 mm bore and a 40 mm nominal stroke. An external stop screw allows you to trim the extend stroke by up to 30 mm on-site, yielding a usable extend range of 10 to 40 mm. The stop screw strictly sets the end position; it is not a load lock, and the cylinder will drift on air loss.
As the SIJ line is end-of-life, the direct replacement is the SAIJ125X40-30S, retaining the same ISO 15552 mounting interface, force, and adjustability. The SAIJ upgrade introduces a two Y-shaped one-way piston seal for lower start-up pressure and longer life. This -S model includes a piston magnet for legacy CS1-B/DS1-B switches.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X40-30S Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X40-30S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X40-30S |
| Bore size | Ø125 mm |
| Stroke | 40 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 SAIJ125X40-30S 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 SAIJ125X40-30S 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 SIJ125X40-30S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×40 | 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 SIJ125X40-30S Is Used
Press Fit Tuning
Dialing in a precise insertion depth on an assembly line where 10 to 40 mm of extend travel must be tuned exactly to the workpiece without swapping cylinders.
Variable Diverter Gate
Actuating a routing flap on a conveyor where the extend endpoint requires occasional 30 mm field adjustments to accommodate different package sizes.
Adjustable Stop Positioning
Providing a hard mechanical stop for pallets, allowing maintenance to trim the extend stroke by up to 30 mm on-site to align with changing pallet dimensions.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X40-30S with the SAIJ125X40-30S
To replace the discontinued SIJ125X40-30S, order the SAIJ125X40-30S; it is a direct swap preserving the G1/2 port, 32 mm rod, and ISO 15552 mounting dimensions. Choose the 30 mm adjust window when you need on-site tuning of the extend stroke within a 10 to 40 mm range. Mounting options include FA, LB, and TC brackets. The -S suffix confirms the piston magnet is present for position sensing. Since the 40 mm stroke is under 300 mm, side-load rod deflection is minimal. Remember that the adjustable stop sets end position only; for load holding on air loss, specify an external rod lock or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X40-30S
- ✓ 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 SIJ125X40-30S FAQ
Yes, the AirTAC SIJ125X40-30S is discontinued. The direct replacement is the SAIJ125X40-30S. It shares the identical ISO 15552 interface, 125 mm bore, 40 mm nominal stroke, 30 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 allows you to trim the extend stroke by up to 30 mm on-site, giving a usable extend range of 10 to 40 mm. The stop sets end position only; it is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X40-30S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X40-30S replacement — usually within 7-8 hours.