This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X50-50FA, 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 SIJ125X50-50FA
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X50-50FA is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 50mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X50-50FA, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke50 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X50-50FA
- 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 SIJ125X50-50FA
The AirTAC SIJ125X50-50FA 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 50 mm on-site, yielding a usable 0-50 mm extension out of the 50 mm nominal maximum. The direct replacement is the SAIJ125X50-50FA, matching the bore, stroke, force, and port.
Because this SKU lacks the -S suffix, it has no magnet and cannot accept a position switch. The SAIJ successor incorporates an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. Note the stop screw sets end position only; it is not a load lock, so use an external rod lock or SAIL/BSAI variant to hold loads.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X50-50FA Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X50-50FA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X50-50FA |
| Bore size | Ø125 mm |
| Stroke | 50 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 SAIJ125X50-50FA 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 SAIJ125X50-50FA 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 SIJ125X50-50FA
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×50 | 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 SIJ125X50-50FA Is Used
Press Fit Tuning
Allows operators to precisely dial in the 0-50 mm extend stroke on-site for pressing bearings without swapping cylinders when material thickness varies.
Variable Depth Sealing
Ideal for carton sealing jaws that require field stroke tuning to accommodate different package heights, using the external stop to set the exact end position.
Adjustable End Stops
Provides a compact 125 mm bore pushing 6136 N at 0.5 MPa for clamping fixtures where the final extend position must be tweaked on the machine.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X50-50FA with the SAIJ125X50-50FA
To replace the discontinued SIJ125X50-50FA, specify SAIJ125X50-50FA for an exact ISO 15552 direct with identical 50 mm nominal stroke, 50 mm adjust window, G1/2 port, and FA foot mount. Choose the 50 mm adjust window if you need to fine-tune the extend end-position on-site. As this is a non-magnetic SKU without -S, it cannot support legacy CS1-B/DS1-B sensors. Since the nominal stroke is 50 mm (under 300 mm), side-load rod deflection is minimal. Remember the adjust screw is not a lock; for load-holding on air loss, select a SAIL or BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X50-50FA
- ✓ 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 SIJ125X50-50FA FAQ
Yes, the SIJ125X50-50FA is discontinued. The direct replacement is the SAIJ125X50-50FA. It shares the same ISO 15552 interface, 125 mm bore, 50 mm stroke, 50 mm adjust window, G1/2 port, and FA mount, but upgrades the piston seal to two Y-shaped one-way elements for longer life.
The external stop screw window is 50 mm, meaning you can trim the extend stroke by up to 50 mm on-site (usable 0-50 mm). The stop sets end position only and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X50-50FA
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X50-50FA replacement — usually within 7-8 hours.