This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X150-50, 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 SIJ125X150-50
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X150-50 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 SAIJ125X150-50, 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 → SAIJ125X150-50
- 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 SIJ125X150-50
The AirTAC SIJ125X150-50 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 50 mm on-site, yielding a usable 100-150 mm extension out of the 150 mm nominal maximum. The direct replacement is the SAIJ125X150-50, preserving the original mounting interface, force, and adjust window.
The stop screw sets the end position but is not a load lock; the piston drifts on air loss and the 40 mm adjustable cushions only decelerate near stroke end. This non-magnet SKU cannot take a switch. The SAIJ successor uses an upgraded two-piece Y-shaped piston seal for lower start-up pressure, and the SAI family adds lock variants (SAIL, BSAI) absent in the legacy SIJ line.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X150-50 Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X150-50 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X150-50 |
| 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 SAIJ125X150-50 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 SAIJ125X150-50 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 SIJ125X150-50
| 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 SIJ125X150-50 Is Used
Press Fit Tuning
Allows operators to dial in the exact 100-150 mm insertion depth for pressing bearings without swapping cylinders.
Variable Diverter Stroke
Adjusts the extend stop on the fly to route different package sizes on a conveyor line within the 50 mm window.
Adjustable Pallet Stop
Sets precise end positions for pallets of varying widths, using the external screw to shorten the extend stroke on-site.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X150-50 with the SAIJ125X150-50
To replace the discontinued SIJ125X150-50, order the direct replacement SAIJ125X150-50, which matches the ISO 15552 dimensions, G1/2 port, and 50 mm adjust window. Choose the -50 mm adjust window if your extend stroke needs field tuning between 100 and 150 mm. Mounting options include FA, LB, and TC. Because this SKU lacks the -S magnet, it cannot accept legacy CS1-B/DS1-B sensors. For strokes at or above 300 mm, carefully manage side loads to prevent rod binding. For held loads, use an external rod lock or pilot-operated check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X150-50
- ✓ 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 SIJ125X150-50 FAQ
Yes, the SIJ125X150-50 is discontinued. The direct replacement is the SAIJ125X150-50, which shares the same ISO 15552 interface, 125 mm bore, 150 mm stroke, 50 mm adjust window, G1/2 port, and mounting.
The external stop screw window is 50 mm, allowing you to trim the extend stroke from the 150 mm nominal maximum down to 100 mm on-site.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X150-50
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X150-50 replacement — usually within 7-8 hours.