This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X500-50, 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 SIJ125X500-50
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X500-50 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 500mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X500-50, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke500 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X500-50
- 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 SIJ125X500-50
The AirTAC SIJ125X500-50 is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 125 mm bore and 500 mm maximum extend. An external stop screw lets you trim the extend stroke by up to 50 mm on-site, giving a usable 450-500 mm window. The direct replacement is the SAIJ125X500-50, matching the interface, force, and mounting.
The SAIJ successor retains the ISO 15552 mounting footprint for direct reuse of FA, LB, and TC brackets, and uses an upgraded two-piece Y-shaped piston seal for lower start-up pressure and longer life. Note this SKU has no -S magnet and cannot take a sensor; the stop screw sets end position but is not a load lock.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X500-50 Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X500-50 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X500-50 |
| Bore size | Ø125 mm |
| Stroke | 500 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 SAIJ125X500-50 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 SAIJ125X500-50 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 SIJ125X500-50
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×500 | 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 SIJ125X500-50 Is Used
Press Fit Tuning
Allows on-site extend stroke adjustment up to 50 mm to dial in exact press-fit depth for large bearings without changing the cylinder.
Divertor Positioning
Adjusts the extend stop on-site to alter the actuator reach for different pallet sizes on a 125 mm bore routing station.
Pallet Stop Setup
Trims the 500 mm extend stroke by up to 50 mm to set precise stopping points for varying pallet widths in handling lines.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X500-50 with the SAIJ125X500-50
To replace the discontinued SIJ125X500-50, order the direct replacement SAIJ125X500-50, keeping the 50 mm adjust window for a 450-500 mm extend. Choose FA, LB, or TC mounts per ISO 15552 interface dimensions. Because this SKU lacks the -S magnet, it cannot accept legacy CS1-B/DS1-B sensors. For the 500 mm stroke, use external guides to prevent rod bending and side-load wear. The stop screw only sets end position; for load holding on air loss, use an external rod lock or the SAIL/BSAI variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X500-50
- ✓ 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 SIJ125X500-50 FAQ
Yes, the SIJ125X500-50 is discontinued. The direct replacement is the SAIJ125X500-50, offering the same ISO 15552 interface, 125 mm bore, 500 mm stroke, 50 mm adjust window, and G1/2 port. The SAIJ family also adds an upgraded piston seal.
The external stop screw provides a 50 mm adjust window, making the usable extend stroke 450-500 mm. The stop sets end position only; it is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X500-50
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X500-50 replacement — usually within 7-8 hours.