This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X75-40SN, 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 SIJ125X75-40SN
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X75-40SN is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 75mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X75-40SN, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke75 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X75-40SN
- 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 SIJ125X75-40SN
The AirTAC SIJ125X75-40SN 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 40mm on-site, giving a usable window of 35-75mm from the 75mm nominal maximum. The direct replacement is the SAIJ125X75-40SN, retaining the same interface, force, and porting.
The SAIJ successor incorporates an upgraded two Y-shaped one-way piston seal for lower start-up pressure and longer life. The -S magnet enables legacy CS1-B/DS1-B sensors, while the -N NBR seal suits -20 to +70C. Remember the stop screw sets end position only; it is not a load lock.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X75-40SN Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X75-40SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X75-40SN |
| Bore size | Ø125 mm |
| Stroke | 75 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 SAIJ125X75-40SN 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 SAIJ125X75-40SN 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 SIJ125X75-40SN
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×75 | 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 SIJ125X75-40SN Is Used
Press Fit Tuning
Allows operators to fine-tune the 35-75mm extend stroke on-site for pressing bearings, accommodating material thickness variations without changing the cylinder.
Variable Depth Sealing
Ideal for sealing cartons of differing heights, using the 40mm adjust screw to set the exact extend end position for each batch on the packaging line.
Adjustable Diverter Stops
Provides a field-adjustable end stop for diverter arms, letting maintenance quickly shorten the extend stroke by up to 40mm to handle new product sizes.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X75-40SN with the SAIJ125X75-40SN
To replace the discontinued SIJ125X75-40SN, order the direct replacement SAIJ125X75-40SN, ensuring you pair it with current AirTAC switches instead of legacy CS1-B/DS1-B sensors. Choose the 40mm adjust window when your fixture needs on-site extend tuning between 35 and 75mm. Mounting options include FA, LB, and TC brackets. The -S suffix confirms the piston magnet is present. Because the 75mm stroke is under 300mm, side-load lever arm concerns are minimal. For held loads, the stop screw is not a lock; specify an external rod lock, pilot-operated check valve, or the SAIL/BSAI variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X75-40SN
- ✓ 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 SIJ125X75-40SN FAQ
Yes, the SIJ125X75-40SN is discontinued. The direct replacement is the SAIJ125X75-40SN, offering the same ISO 15552 interface, 125mm bore, 75mm stroke, 40mm adjust window, G1/2 port, and force. The SAIJ features an upgraded piston seal and uses current AirTAC switches.
The external stop screw provides a 40mm adjust window, allowing the extend stroke to be shortened from the 75mm nominal maximum down to 35mm. The stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X75-40SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X75-40SN replacement — usually within 7-8 hours.