This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X500-50S, 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 SIJ125X500-50S
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X500-50S 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 SAIJ125X500-50S, 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 → SAIJ125X500-50S
- 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 SIJ125X500-50S
The AirTAC SIJ125X500-50S is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder. A G1/2 port, 32mm rod, and 40mm adjustable cushions frame this 125mm bore unit. The external stop screw lets you trim the extend stroke by up to 50mm on-site, yielding a usable 450-500mm range from the 500mm nominal maximum. The stop sets end position only; it is not a load lock.
The direct replacement is the SAIJ125X500-50S, matching the ISO 15552 mounting interface, bore, and force. The SAIJ upgrade uses a two Y-shaped one-way piston seal for low start-up pressure and long life. The -S suffix provides a piston magnet for legacy CS1-B/DS1-B switches.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X500-50S Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X500-50S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X500-50S |
| 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 SAIJ125X500-50S 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 SAIJ125X500-50S 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 SIJ125X500-50S
| 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 SIJ125X500-50S Is Used
Press Tonnage Calibration
Needs field stroke tuning to dial in the exact 450-500mm extend endpoint during die setup, preventing over-travel on varying material thicknesses.
Package Divert Positioning
Requires adjustable end-positioning to alter the extend reach on-site for different carton widths without swapping out the entire actuator assembly.
Palletizing Stop Gate
Uses the 50mm stop screw window to fine-tune the extend stroke distance for mixed pallet sizes, ensuring precise physical stops without reprogramming controls.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X500-50S with the SAIJ125X500-50S
To replace the discontinued SIJ125X500-50S, order the SAIJ125X500-50S; it is a direct match for the ISO 15552 interface, G1/2 port, and 50mm adjust window. Choose the 50mm adjust window if your extend stroke needs on-site tuning between 450mm and 500mm. Mounting options include FA, LB, and TC. The -S magnet enables position sensing. Because the 500mm stroke is long, verify side-load limits and use external guides to prevent rod bending. The stop screw sets end position but does not hold loads on air loss; for held loads use an external rod lock or SAIL/BSAI variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X500-50S
- ✓ 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 SIJ125X500-50S FAQ
Yes, the SIJ125X500-50S is discontinued. The direct replacement is the SAIJ125X500-50S. It matches the ISO 15552 interface, 125mm bore, 500mm stroke, 50mm adjust window, G1/2 port, and mounting. The SAIJ uses an upgraded two Y-shaped one-way piston seal for longer life and lower start-up pressure.
The external stop screw window is 50mm, allowing you to trim the extend stroke on-site from the 500mm maximum down to 450mm. The stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X500-50S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X500-50S replacement — usually within 7-8 hours.