This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X600-20S, 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 SIJ125X600-20S
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X600-20S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 600mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X600-20S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke600 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X600-20S
- 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 SIJ125X600-20S
The AirTAC SIJ125X600-20S is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder. Its external stop screw lets you trim the extend stroke by up to 20 mm on-site, giving a usable 580-600 mm stroke out of the 600 mm nominal maximum. The direct replacement is the SAIJ125X600-20S, matching the bore, force, adjust window, port, and mounting.
The SAIJ upgrade introduces an upgraded two-piece Y-shaped piston seal for lower start-up pressure and longer life. The stop screw sets the end position but is not a load lock; for held loads use an external rod lock or SAIL/BSAI variant.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X600-20S Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X600-20S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X600-20S |
| Bore size | Ø125 mm |
| Stroke | 600 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 SAIJ125X600-20S 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 SAIJ125X600-20S 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 SIJ125X600-20S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×600 | 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 SIJ125X600-20S Is Used
Press Tonnage Calibration
Needs field stroke tuning to set precise 580-600 mm extend endpoints during press setup, preventing over-travel on varying workpiece heights.
Pallet Positioning Stops
Requires trimming the extend stroke by up to 20 mm on-site to accommodate different pallet lengths without repositioning the ISO 15552 mount.
Heavy Lift Damping
Uses the 40 mm adjustable air cushion to decelerate heavy 313 kg vertical loads safely near the end of the 600 mm stroke.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X600-20S with the SAIJ125X600-20S
To replace the discontinued SIJ125X600-20S, order the direct replacement SAIJ125X600-20S to reuse your ISO 15552 mounting interface. This 125 mm bore features a 20 mm adjust window (580-600 mm usable extend), a G1/2 port, and an M27x2 rod thread. Choose FA, LB, or TC mounts as needed; the -S suffix confirms a piston magnet is present for switch sensing. For the 600 mm stroke, add external guides to prevent rod bending and manage side loads. Speed is 30-500 mm/s.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X600-20S
- ✓ 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 SIJ125X600-20S FAQ
Yes, the SIJ125X600-20S is discontinued. The direct replacement is the SAIJ125X600-20S. It shares the same ISO 15552 interface, 125 mm bore, 600 mm stroke, 20 mm adjust window, G1/2 port, and mounting options, but adds an upgraded piston seal.
The external stop screw window is 20 mm, allowing a usable extend stroke of 580-600 mm. The stop sets end position and is not a load lock; speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X600-20S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X600-20S replacement — usually within 7-8 hours.