This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X75-20, 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 SIJ125X75-20
The AirTAC Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X75-20 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 75mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X75-20, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke75 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X75-20
- 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 SIJ125X75-20
The AirTAC SIJ125X75-20 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 20 mm on-site, giving a usable 55-75 mm extend out of the 75 mm nominal maximum. The direct replacement is the SAIJ125X75-20, matching the interface, force, and mounting.
Upgrading to the SAIJ family retains the ISO 15552 mounting footprint but introduces an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. This SKU has no -S magnet and cannot accept a sensor. The stop screw sets end position only; it is not a load lock.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X75-20 Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X75-20 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X75-20 |
| Bore size | Ø125 mm |
| Stroke | 75 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 SAIJ125X75-20 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 SAIJ125X75-20 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 SIJ125X75-20
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×75 | 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 SIJ125X75-20 Is Used
Press Fit Calibration
Fine-tune the 55-75 mm extend stroke on-site to set precise pressing depths for bearing insertion without machining custom spacers.
Variable Carton Flap Folding
Adjust the extend endpoint by up to 20 mm to accommodate changing package heights on a packaging line running at up to 500 mm/s.
End-of-Stroke Positioning
Dial in the exact forward stop position for heavy 313 kg vertical lift tasks, relying on the external screw rather than fixed mechanical shims.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X75-20 with the SAIJ125X75-20
To replace the discontinued SIJ125X75-20, order the direct replacement SAIJ125X75-20, keeping the 20 mm adjust window and 75 mm nominal stroke. Choose FA, LB, or TC mountings to reuse your existing ISO 15552 interface points. Because this SKU lacks the -S magnet, it cannot accept legacy CS1-B/DS1-B sensors; add external sensing if needed. For strokes at or above 300 mm, verify side-load limits to prevent guide wear. Remember the external stop trims extend position but provides no load holding on air loss.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X75-20
- ✓ 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 SIJ125X75-20 FAQ
Yes, the SIJ125X75-20 is discontinued. The direct replacement is the SAIJ125X75-20. It matches the ISO 15552 interface, 125 mm bore, 75 mm stroke, 20 mm adjust window, G1/2 port, and mounting options, while adding an upgraded piston seal.
The external stop screw provides a 20 mm adjust window, allowing you to shorten the 75 mm extend stroke down to 55 mm on-site. The screw sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X75-20
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X75-20 replacement — usually within 7-8 hours.