This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X800-50, 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 SIJ125X800-50
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X800-50 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 800mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X800-50, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke800 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X800-50
- 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 SIJ125X800-50
The AirTAC SIJ125X800-50 is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 125 mm bore and 800 mm maximum stroke. An external stop screw lets you trim the extend stroke by up to 50 mm on-site, giving a usable extend range of 750-800 mm. The direct replacement is the SAIJ125X800-50, sharing the same interface, force, and adjust window.
The SAIJ successor incorporates an upgraded two-piece Y-shaped piston seal for lower start-up pressure and longer life. Note this SKU lacks a -S magnet so it cannot accept a sensor. The stop screw sets end position only; it is not a load lock, so use an external rod lock for held loads.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X800-50 Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X800-50 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X800-50 |
| Bore size | Ø125 mm |
| Stroke | 800 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 SAIJ125X800-50 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 SAIJ125X800-50 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 SIJ125X800-50
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×800 | 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 SIJ125X800-50 Is Used
Press Tonnage Calibration
Needs field stroke tuning to set precise 750-800 mm extend endpoints during light press assembly, preventing over-travel before final locking.
Pallet Stop Adjustment
Accommodates varying package lengths on a 125 mm bore line by trimming the extend stroke 50 mm on-site without swapping the cylinder.
Stacker Height Tuning
Dialing in the exact upper push position for mixed pallet heights, using the external stop to set the end position before applying an external guide.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X800-50 with the SAIJ125X800-50
To replace the discontinued SIJ125X800-50, order the direct replacement SAIJ125X800-50, keeping the identical 125 mm bore, 800 mm stroke, 50 mm adjust window, G1/2 port, and ISO 15552 mounting. Choose the 50 mm adjust window if your extend stroke needs on-site tuning between 750 mm and 800 mm. Mounting options include Basic, FA, LB, and TC. Because the 800 mm stroke exceeds 300 mm, account for side-load and rod-bending by using external guides. This non-magnetic SKU cannot take a switch; for load holding on air loss, select the SAIL or BSAI lock variant instead of relying on the cushion.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X800-50
- ✓ 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 SIJ125X800-50 FAQ
Yes, the SIJ125X800-50 is discontinued. The direct replacement is the SAIJ125X800-50. It shares the same ISO 15552 interface, 125 mm bore, 800 mm stroke, 50 mm adjust window, G1/2 port, and mounting, but adds an upgraded piston seal.
The external stop screw window is 50 mm, allowing the extend stroke to be shortened from the 800 mm maximum down to 750 mm. The stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X800-50
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X800-50 replacement — usually within 7-8 hours.