This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X250-75, 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 SIJ125X250-75
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X250-75 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 250mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X250-75, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke250 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X250-75
- 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 SIJ125X250-75
The AirTAC SIJ125X250-75 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 75 mm on-site, giving a usable 175-250 mm stroke. It features a G1/2 port, M27x2 rod thread, and 40 mm adjustable cushions. The direct replacement is the SAIJ125X250-75, sharing the same interface, force, and mounts.
The SAIJ successor uses an upgraded two-piece Y-shaped piston seal for lower start-up pressure and longer life. This SKU has no -S magnet and cannot take a sensor. The stop screw sets end position but is not a lock; use an external rod lock for held loads.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X250-75 Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X250-75 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X250-75 |
| Bore size | Ø125 mm |
| Stroke | 250 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 SAIJ125X250-75 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 SAIJ125X250-75 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 SIJ125X250-75
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×250 | 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 SIJ125X250-75 Is Used
Press Fit Tuning
Adjusts the extend stroke on-site to set precise pressing depths for bearings without swapping the cylinder.
Variable Transfer Stops
Trims the extend position to handle different package sizes on a single conveyor line.
Adjustable Diverters
Fine-tunes the diverting stroke length on-site to accommodate varying pallet widths.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X250-75 with the SAIJ125X250-75
To replace the discontinued SIJ125X250-75, order the direct replacement SAIJ125X250-75, reusing your FA, LB, or TC mounts. This unit has a 75 mm adjust window (175-250 mm usable extend). Because this SKU lacks the -S magnet, it cannot accept legacy CS1-B/DS1-B sensors. For this 250 mm stroke, side-load is moderate, but for any stroke >=300 mm ensure guide alignment to prevent rod seal wear. Remember the stop screw is not a load lock; for held loads use SAIL/BSAI or an external rod lock.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X250-75
- ✓ 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 SIJ125X250-75 FAQ
Yes, the SIJ125X250-75 is discontinued. The direct replacement is the SAIJ125X250-75. It shares the same ISO 15552 interface, 125 mm bore, 250 mm stroke, 75 mm adjust window, G1/2 port, and mounting options, but adds an upgraded piston seal.
The external stop screw provides a 75 mm adjust window, allowing the extend stroke to be shortened from 250 mm down to 175 mm. Note the stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X250-75
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X250-75 replacement — usually within 7-8 hours.