This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X30-20, 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 SIJ125X30-20
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X30-20 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 30mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X30-20, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke30 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X30-20
- 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 SIJ125X30-20
The AirTAC SIJ125X30-20 is a double-acting, double-rod ISO 15552 adjustable-stroke cylinder with a 125 mm bore and 30 mm maximum extend. An external stop screw lets you trim the extend stroke by up to 20 mm on-site, yielding a usable 10-30 mm end position. This discontinued SIJ series model is directly replaced by the SAIJ125X30-20, which preserves the G1/2 port, M27x2 rod thread, and 40 mm adjustable cushions. The SAIJ upgrade introduces a two Y-shaped one-way piston seal for lower start-up pressure and longer life.
Note this SKU lacks a -S magnet and cannot accept a sensor. The stop screw sets end position but is not a load lock; use an external rod lock or SAIL/BSAI variant for held loads.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X30-20 Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X30-20 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X30-20 |
| Bore size | Ø125 mm |
| Stroke | 30 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 SAIJ125X30-20 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 SAIJ125X30-20 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 SIJ125X30-20
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×30 | 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 SIJ125X30-20 Is Used
Press Fit Tuning
Trimming the 30 mm extend stroke by up to 20 mm on-site allows operators to dial in precise bearing seating depths without swapping cylinders.
Transfer Stop Adjustment
The external stop screw lets maintenance teams adjust the 10-30 mm protrusion of a conveyor diverter pin to accommodate varying package sizes.
End-of-Arm Positioning
Useful for setting exact gripper extension limits in confined spaces where repositioning a fixed-stroke ISO 15552 cylinder would require disassembly.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X30-20 with the SAIJ125X30-20
To replace the discontinued SIJ125X30-20, order the direct replacement SAIJ125X30-20, retaining your existing ISO 15552 FA, LB, or TC mounting hardware. This 125 mm bore operates at 30-500 mm/s. The 20 mm adjust window is ideal for fine-tuning the 10-30 mm extend without machining a custom stop. Because this SKU lacks the -S magnet, it cannot support legacy CS1-B/DS1-B sensors; add external physical stops if detection is required. The external adjust screw only sets the end position and does not lock the load—never rely on it or the air cushion for load holding under air loss.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X30-20
- ✓ 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 SIJ125X30-20 FAQ
Yes, the SIJ125X30-20 is discontinued. The direct replacement is the SAIJ125X30-20, offering the same ISO 15552 interface, 125 mm bore, 30 mm stroke, 20 mm adjust window, G1/2 port, and mounting compatibility. The SAIJ family features an upgraded two Y-shaped one-way piston seal for longer life.
The external stop screw provides a 20 mm trim window, reducing the nominal 30 mm extend stroke down to 10 mm. The stop sets end position only and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X30-20
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X30-20 replacement — usually within 7-8 hours.