This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X125-20, 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 SIJ125X125-20
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X125-20 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 125mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X125-20, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke125 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X125-20
- 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 SIJ125X125-20
The AirTAC SIJ125X125-20 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, yielding a usable 105-125 mm range from the 125 mm nominal maximum. The direct replacement is the SAIJ125X125-20, matching the interface, force, and adjust window.
Beyond the upgrade to a two Y-shaped one-way piston seal for lower start-up pressure and longer life, the SAIJ family introduces SAIL and BSAI lock variants absent in the legacy SI line. Note this SKU lacks a -S magnet and cannot accept a sensor; additionally, the stop screw sets end position but is not a load lock.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X125-20 Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X125-20 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X125-20 |
| Bore size | Ø125 mm |
| Stroke | 125 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 SAIJ125X125-20 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 SAIJ125X125-20 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 SIJ125X125-20
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×125 | 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 SIJ125X125-20 Is Used
Press Fit Calibration
Allows on-site extend stroke trimming by up to 20 mm to dial in exact press-fit depths for varying bearing housing tolerances without changing the cylinder body.
Variable Depth Forming
Provides adjustable end-position stopping for carton forming presses, accommodating different package heights on the fly using the 105-125 mm usable stroke.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X125-20 with the SAIJ125X125-20
To replace the discontinued SIJ125X125-20, order the direct replacement SAIJ125X125-20, reusing your existing ISO 15552 FA, LB, or TC mounts. The 20 mm adjust window allows precise extend tuning without machining. Because this SKU has no -S magnet, sensing is impossible; add external sensors if required. For strokes at or above 300 mm, verify side-load limits to prevent guide wear. Remember, the stop screw is not a lock; for held loads use an external rod lock.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X125-20
- ✓ 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 SIJ125X125-20 FAQ
Yes, the SIJ125X125-20 is discontinued. The SAIJ features an upgraded piston seal for longer life.
The theoretical max is 1251 kgf at 1.0 MPa. The external stop screw provides a 20 mm adjust window, allowing you to shorten the extend stroke from the 125 mm maximum down to 105 mm. The stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X125-20
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X125-20 replacement — usually within 7-8 hours.