This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X500-75S, 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 SIJ125X500-75S
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X500-75S 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 SAIJ125X500-75S, 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 → SAIJ125X500-75S
- 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 SIJ125X500-75S
The AirTAC SIJ125X500-75S is a double-acting double-rod ISO 15552 adjustable-stroke cylinder. An external stop screw lets you trim the extend stroke by up to 75mm on-site, yielding a usable 425-500mm stroke from the 500mm nominal maximum. This SIJ model is discontinued; the direct replacement is the SAIJ125X500-75S, sharing the exact interface, force, and mounting.
The SAIJ upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The stop screw sets end position but is not a load lock; use SAIL or BSAI for held loads. The -S suffix provides a piston magnet for CS1-B/DS1-B switches.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X500-75S Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X500-75S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X500-75S |
| 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 SAIJ125X500-75S 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 SAIJ125X500-75S 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 SIJ125X500-75S
| 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 SIJ125X500-75S Is Used
Press Fit Tuning
Adjust the 75mm stop screw to set precise insertion depth for bearings without changing the 500mm maximum cylinder stroke.
Variable Length Diverter
Tune the extend position on-site to deflect varying package sizes on a conveyor line using the 425-500mm stroke window.
Adjustable End Stop
Set exact end positions for pallet handling, using the external stop screw to adapt to different pallet dimensions.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X500-75S with the SAIJ125X500-75S
To replace the discontinued SIJ125X500-75S, use the SAIJ125X500-75S direct, retaining the ISO 15552 mounting interface and G1/2 port. The 75mm adjust window allows precise extend tuning without machining. Mounting options include FA, LB, and TC. The -S magnet supports legacy CS1-B/DS1-B sensors. For the 500mm stroke, use external guides to prevent rod bending and manage side loads. Speed is 30-500mm/s.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X500-75S
- ✓ 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 SIJ125X500-75S FAQ
Yes, the SIJ125X500-75S is discontinued. The direct replacement is the SAIJ125X500-75S, which shares the ISO 15552 interface, 125mm bore, 500mm stroke, 75mm adjust window, and G1/2 port.
The external stop screw offers a 75mm adjust window, allowing the extend stroke to be shortened from 500mm down to 425mm on-site.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X500-75S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X500-75S replacement — usually within 7-8 hours.