This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X75-40, 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 SIJ125X75-40
The AirTAC Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X75-40 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 SAIJ125X75-40, 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 → SAIJ125X75-40
- 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 SIJ125X75-40
The AirTAC SIJ125X75-40 is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder. The external stop screw lets you trim the extend stroke by up to 40mm on-site, giving a usable 35-75mm range. The direct replacement is the SAIJ125X75-40, which adds an upgraded two-piece Y-shaped piston seal for lower start-up pressure and longer life while retaining the interface and 40mm adjustable cushions.
Because the stop screw sets the end position, it is not a load lock; use an external rod lock or the SAIL/BSAI variant for held loads. This non-magnet SKU cannot take a switch. SAIJ beats a fixed SAI plus external stop by integrating the stroke tuning cleanly within the ISO 15552 mounting footprint.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X75-40 Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X75-40 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X75-40 |
| 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 SAIJ125X75-40 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 SAIJ125X75-40 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 SIJ125X75-40
| 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 SIJ125X75-40 Is Used
Press Fit Tuning
Dialing in exact insertion depth on a 313kg vertical assembly where the 40mm stop window allows operators to trim the 75mm extend stroke on-site without swapping cylinders.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X75-40 with the SAIJ125X75-40
To replace this discontinued SIJ125X75-40, order the direct replacement SAIJ125X75-40 (same 75mm max stroke, 40mm adjust window, G1/2 port, and FA/LB/TC mountings). Choose the 40mm adjust window if your end-position needs field tuning across a 35-75mm extend range. For strokes over 300mm, verify side-load guide capacity. Add the -S magnet suffix if you need legacy CS1-B/DS1-B sensor accuracy; this base SKU has no sensing.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X75-40
- ✓ 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 SIJ125X75-40 FAQ
Yes, the SIJ125X75-40 is discontinued. The direct replacement is the SAIJ125X75-40. It shares the same ISO 15552 interface, 125mm bore, 75mm max stroke, 40mm adjust window, G1/2 port, and mountings, but upgrades to a two-piece Y-shaped piston seal for longer life.
The external stop screw window is 40mm, allowing you to trim the extend stroke from the 75mm maximum down to 35mm. The stop sets end position only; it is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X75-40
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X75-40 replacement — usually within 7-8 hours.