This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X30-20S, 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 SIJ125X30-20S
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X30-20S 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 SAIJ125X30-20S, 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 → SAIJ125X30-20S
- 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 SIJ125X30-20S
The AirTAC SIJ125X30-20S 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, giving a usable 10 to 30mm extend window from the 30mm nominal maximum. The stop sets the end position but is not a load lock. This 125mm bore uses a G1/2 port, an M27x2 rod thread, and 40mm adjustable cushions.
The direct replacement is the SAIJ125X30-20S, reusing your ISO 15552 mounting interface and bore specs. The SAIJ upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The -S suffix denotes a piston magnet for legacy CS1-B/DS1-B sensors.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X30-20S Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X30-20S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X30-20S |
| 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 SAIJ125X30-20S 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 SAIJ125X30-20S 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 SIJ125X30-20S
| 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 SIJ125X30-20S Is Used
Short-Stroke Clamping
Provides field-tunable 10 to 30mm clamping travel for oversized workpieces, allowing operators to dial in the exact grip without swapping cylinders.
Variable Package Diverting
Adjusts the extend stop on-site to handle varying package heights on a sorting line, ensuring precise physical contact for the diverter arm.
Adjustable End-Stops
Sets a precise physical end position for lightweight pallet stops, where the 20mm trim window accommodates minor pallet size variations.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X30-20S with the SAIJ125X30-20S
To replace the discontinued SIJ125X30-20S, order the direct replacement SAIJ125X30-20S; it matches the 125mm bore, 30mm nominal stroke, 20mm adjust window, G1/2 port, and FA/LB/TC mountings. Choose the 20mm adjust window when you need field tuning of the extend endpoint within a 10 to 30mm range. Retain the -S magnet for position sensing. Because the nominal stroke is 30mm, the stroke>=300mm side-load rule does not apply. Remember the external stop is not a lock; for load holding on air loss, use an external rod lock or the SAIL/BSAI variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X30-20S
- ✓ 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 SIJ125X30-20S FAQ
Yes, the SIJ125X30-20S is discontinued. The direct replacement is the SAIJ125X30-20S. It shares the same ISO 15552 interface, 125mm bore, 30mm nominal stroke, 20mm adjust window, G1/2 port, and mounting options, but adds an upgraded SAI piston seal.
The external stop screw provides a 20mm adjust window, allowing you to shorten the 30mm extend stroke down to 10mm on-site. Speed is 30-500mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X30-20S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X30-20S replacement — usually within 7-8 hours.