This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X250-75S, 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 SIJ125X250-75S
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X250-75S 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 SAIJ125X250-75S, 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 → SAIJ125X250-75S
- 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 SIJ125X250-75S
The AirTAC SIJ125X250-75S is a double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 125 mm bore and 250 mm nominal stroke. An external stop screw lets you trim the extend stroke by up to 75 mm on-site, yielding a usable extend range of 175-250 mm. The stop sets the end position; it is not a load lock. This SIJ model is discontinued; the direct replacement is the SAIJ125X250-75S, retaining the same G1/2 port, M27x2 rod thread, and 40 mm adjustable cushions.
The SAIJ successor features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The -S suffix indicates a built-in piston magnet for legacy CS1-B/DS1-B switches.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X250-75S Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X250-75S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X250-75S |
| 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 SAIJ125X250-75S 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 SAIJ125X250-75S 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 SIJ125X250-75S
| 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 SIJ125X250-75S Is Used
Press Fit Tuning
Allows operators to dial in the exact 175-250 mm extend position for pressing bearings without machining custom spacers.
Variable Format Sealing
Adjusts the extend endpoint on the fly to accommodate different carton depths on a packaging line.
Adjustable Stops
Provides a field-tunable end position for diverter arms handling mixed pallet sizes.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X250-75S with the SAIJ125X250-75S
To replace the discontinued SIJ125X250-75S, order the direct replacement SAIJ125X250-75S, which preserves the ISO 15552 mounting interface, 250 mm stroke, and 75 mm adjust window. Choose the 75 mm adjust window when your fixture requires field stroke tuning between 175 mm and 250 mm. Mounting options include Basic, FA, LB, and TC. The -S suffix confirms the piston magnet is present for legacy CS1-B/DS1-B sensors. For strokes at or above 300 mm, carefully manage side-load to prevent excessive guide wear. The cylinder does not hold loads on air loss; for held loads use an external rod lock or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X250-75S
- ✓ 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 SIJ125X250-75S FAQ
Yes, the SIJ125X250-75S is discontinued. The direct replacement is the SAIJ125X250-75S. It shares the same ISO 15552 interface, 125 mm bore, 250 mm stroke, 75 mm adjust window, G1/2 port, and mounting options, while adding an upgraded piston seal.
The external stop screw offers a 75 mm adjust window, allowing the extend stroke to be shortened from the 250 mm nominal maximum down to 175 mm.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X250-75S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X250-75S replacement — usually within 7-8 hours.