This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X150-20, 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 SIJ125X150-20
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X150-20 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 150mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X150-20, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke150 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X150-20
- 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 SIJ125X150-20
The AirTAC SIJ125X150-20 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 20mm on-site, yielding a 130-150mm usable window. The direct replacement is the SAIJ125X150-20.
The SAIJ upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The stop sets end position but is not a load lock; use SAIL or BSAI for held loads.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X150-20 Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X150-20 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X150-20 |
| Bore size | Ø125 mm |
| Stroke | 150 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 SAIJ125X150-20 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 SAIJ125X150-20 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 SIJ125X150-20
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×150 | 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 SIJ125X150-20 Is Used
Press Fit Tuning
Needs field stroke tuning to dial in the exact 130-150mm insertion depth for pressing bearings without machining custom spacers.
Variable Carton Sealing
Requires adjustable end-position to accommodate slight box height variances on the fly, trimming the extend stroke by up to 20mm.
End-of-Arm Forming
Demands precise external stop adjustment for a metal forming operation, allowing operators to shorten the stroke window on-site.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X150-20 with the SAIJ125X150-20
To replace this discontinued model, map directly to the SAIJ125X150-20, keeping the 150mm nominal stroke, 20mm adjust window, and G1/2 port. Choose the 20mm adjust window if you need 130-150mm end-position tuning; the stop screw sets the end position but is not a lock. Reuse FA, LB, or TC ISO 15552 mounts. This SKU lacks the -S magnet and cannot take a switch. For stroke >=300mm, confirm guide alignment to manage side-load.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X150-20
- ✓ 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 SIJ125X150-20 FAQ
Yes, the SIJ125X150-20 is discontinued. The direct replacement is the SAIJ125X150-20, which shares the same ISO 15552 interface, 125mm bore, 150mm stroke, 20mm adjust window, G1/2 port, and mounting options. The SAIJ family also adds an upgraded two Y-shaped one-way piston seal.
The external stop screw window is 20mm, allowing you to trim the extend stroke on-site from the 150mm maximum down to 130mm. The stop sets end position only; it is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X150-20
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X150-20 replacement — usually within 7-8 hours.