This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X70-40, 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 SIJ125X70-40
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X70-40 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 70mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X70-40, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke70 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X70-40
- 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 SIJ125X70-40
The AirTAC SIJ125X70-40 is a double-acting double-rod ISO 15552 adjustable-stroke cylinder, discontinued and replaced by the direct replacement SAIJ125X70-40. It has a 125mm bore, G1/2 port, and 70mm nominal stroke, letting you trim the extend stroke by up to 40mm on-site (usable 30-70mm). The external stop screw sets the end position but is not a load lock; use an external rod lock for held loads.
The SAIJ upgrade retains the ISO 15552 mounting interface and adds a two-piece Y-shaped piston seal for lower start-up pressure and longer life. This non-magnetic SKU cannot take a switch.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X70-40 Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X70-40 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X70-40 |
| Bore size | Ø125 mm |
| Stroke | 70 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 SAIJ125X70-40 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 SAIJ125X70-40 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 SIJ125X70-40
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×70 | 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 SIJ125X70-40 Is Used
Press Fit Tuning
Allows operators to dial in the exact 30-70mm extend position for seating bearings without machining custom spacers.
Variable Carton Flap Control
Provides adjustable end-stops for forming different box depths on the fly, avoiding the need for manual mechanical adjustments.
Adjustable Ejector Stroke
Sets precise part ejection distances from molds based on part height variations, utilizing the 40mm trim window.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X70-40 with the SAIJ125X70-40
To replace the discontinued SIJ125X70-40, order the direct replacement SAIJ125X70-40, which matches the 125mm bore, 70mm nominal stroke, 40mm adjust window, G1/2 port, and ISO 15552 mounting. Choose the 40mm adjust window if your application requires field tuning of the extend stroke within a 30-70mm range. Mounting options include FA, LB, and TC brackets. Because this SKU lacks the -S suffix, it cannot accept a magnetic switch. For stroke lengths of 300mm or greater, verify your side-load limits to prevent excessive guide wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X70-40
- ✓ 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 SIJ125X70-40 FAQ
Yes, the AirTAC SIJ125X70-40 is discontinued. The direct replacement is the SAIJ125X70-40, which shares the same ISO 15552 interface, 125mm bore, 70mm stroke, 40mm adjust window, G1/2 port, and mounting options. The SAIJ family also features an upgraded two-piece Y-shaped piston seal for lower start-up pressure.
The external stop screw allows you to trim the extend stroke by up to 40mm on-site, giving a usable extend range of 30-70mm. The stop sets the end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X70-40
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X70-40 replacement — usually within 7-8 hours.