This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X120-30, 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 SIJ125X120-30
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X120-30 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 120mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X120-30, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke120 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X120-30
- 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 SIJ125X120-30
The AirTAC SIJ125X120-30 is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 125 mm bore and 120 mm maximum stroke. An external stop screw lets you trim the extend stroke by up to 30 mm on-site, yielding a usable 90-120 mm extension window. The direct replacement is the SAIJ125X120-30, matching the interface, force, and mounting.
The SAIJ upgrade incorporates an advanced two-piece Y-shaped piston seal for lower start-up pressure and extended life. Note this SKU lacks a -S magnet and cannot accept a switch. The stop screw sets end position but is not a lock; loads will drift on air loss, so use an external rod lock or SAIL/BSAI variant for holding.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X120-30 Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X120-30 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X120-30 |
| Bore size | Ø125 mm |
| Stroke | 120 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 SAIJ125X120-30 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 SAIJ125X120-30 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 SIJ125X120-30
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×120 | 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 SIJ125X120-30 Is Used
Press Fit Tuning
Allows operators to dial in the exact 90-120 mm extend position for inserting bearings without machining hard stops.
Variable Depth Sealing
Adjusts the extend end-point on the fly to accommodate different box heights during carton sealing operations.
Forming Stop Adjustment
Provides a field-tunable end position for metal bending or light forming tasks requiring precise 30 mm stroke reduction.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X120-30 with the SAIJ125X120-30
To replace the discontinued SIJ125X120-30, order the direct replacement SAIJ125X120-30, retaining the same ISO 15552 mounting footprint and G1/2 port. Choose the 30 mm adjust window if your extend stroke needs on-site tuning between 90 and 120 mm. Mounting options include FA, LB, and TC brackets. Because this SKU has no -S magnet, it cannot support position sensing. For strokes at or above 300 mm, carefully manage side loads to prevent premature seal wear. The stop screw defines end position only; it does not lock the load, so add a pilot-operated check valve or external rod lock for hold requirements.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X120-30
- ✓ 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 SIJ125X120-30 FAQ
Yes, the SIJ125X120-30 is discontinued. The direct replacement is the SAIJ125X120-30, which shares the identical ISO 15552 interface, 125 mm bore, 120 mm stroke, 30 mm adjust window, and G1/2 port.
The external stop screw allows trimming the extend stroke by up to 30 mm on-site, giving a usable 90-120 mm extension window. The stop sets position only and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X120-30
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X120-30 replacement — usually within 7-8 hours.