This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X320-50SLB, 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 SIJ125X320-50SLB
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X320-50SLB is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 320mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X320-50SLB, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke320 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X320-50SLB
- 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 SIJ125X320-50SLB
The AirTAC SIJ125X320-50SLB is a discontinued double-acting double-rod adjustable-stroke ISO 15552 cylinder. An external stop screw lets you trim the extend stroke by up to 50 mm on-site, giving a usable 270-320 mm stroke out of the 320 mm nominal maximum. The direct replacement is the SAIJ125X320-50SLB, matching the bore, force, adjust window, and mount.
The SAIJ successor retains the ISO 15552 mounting interface for direct reuse of your LB brackets and adds an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. The stop screw sets end position only; it is not a load lock. For held loads use SAIL, BSAI, or an external rod lock.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X320-50SLB Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X320-50SLB |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X320-50SLB |
| Bore size | Ø125 mm |
| Stroke | 320 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 SAIJ125X320-50SLB 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 SAIJ125X320-50SLB 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 SIJ125X320-50SLB
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×320 | 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 SIJ125X320-50SLB Is Used
Press Fit Tuning
Trimming the extend stroke by up to 50 mm on-site allows precise press-fit depth adjustment without disassembling the tooling.
Variable Carton Flaps
Adjusting the end position accommodates varying carton heights on the fly, ensuring consistent sealing pressure.
End-Stop Calibration
Setting the exact 270-320 mm extend stop externally simplifies calibration for parts presenting slight dimensional variance.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X320-50SLB with the SAIJ125X320-50SLB
To replace the discontinued SIJ125X320-50SLB, order the SAIJ125X320-50SLB for an exact ISO 15552 direct fit. The 50 mm adjust window is ideal for field-tuning the extend end position without machining. Reuse your LB mounting brackets directly. The -S magnet supports legacy CS1-B/DS1-B switches. Because the 320 mm stroke exceeds 300 mm, verify side-load limits and use external guides to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X320-50SLB
- ✓ 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 SIJ125X320-50SLB FAQ
Yes, it is discontinued. The direct replacement is the SAIJ125X320-50SLB. It shares the same ISO 15552 interface, 125 mm bore, 320 mm stroke, 50 mm adjust window, G1/2 port, and LB mounting, but adds an upgraded piston seal.
The external stop screw provides a 50 mm adjust window, making the usable extend stroke 270-320 mm. The stop sets end position only; it is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X320-50SLB
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X320-50SLB replacement — usually within 7-8 hours.