This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X75-50S, 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 SIJ125X75-50S
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X75-50S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 75mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X75-50S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke75 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X75-50S
- 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 SIJ125X75-50S
The AirTAC SIJ125X75-50S is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 125mm bore and 75mm maximum stroke. An external stop screw lets you trim the extend stroke by up to 50mm on-site, yielding a usable 25-75mm extension window. The stop sets the end position but is not a load lock.
The direct replacement is the SAIJ125X75-50S, retaining the same ISO 15552 mounting interface, force, and adjustability. The SAIJ upgrade features a two Y-shaped one-way piston seal for lower start-up pressure and longer life. Note that a plain cylinder drifts on air loss; use an external rod lock or SAIL/BSAI variant for held loads.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X75-50S Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X75-50S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X75-50S |
| Bore size | Ø125 mm |
| Stroke | 75 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 SAIJ125X75-50S 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 SAIJ125X75-50S 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 SIJ125X75-50S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×75 | 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 SIJ125X75-50S Is Used
Press Fit Tuning
Dialing in precise insertion depths on an assembly line where 25-75mm of extend travel must be trimmed on-site to avoid over-travel.
Variable Diverter Gate
Actuating a routing flap that requires field adjustment of the extend endpoint to accommodate different package profiles.
Adjustable Stops
Positioning pallet stops where the extend stroke needs on-site shortening by up to 50mm to handle varying load dimensions.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X75-50S with the SAIJ125X75-50S
To replace the discontinued SIJ125X75-50S, order the SAIJ125X75-50S direct, keeping the 125mm bore, 75mm nominal stroke, 50mm adjust window, and G1/2 port. Choose the 50mm adjust window if your end-position needs field tuning between 25mm and 75mm. Reuse FA, LB, or TC ISO 15552 mounts. The -S suffix provides a piston magnet for legacy CS1-B/DS1-B switches (SAIJ uses current switches). For strokes >=300mm, verify side-load guidance. The stop screw sets end position only; it is not a lock, so add a pilot-operated check valve or external rod lock for load holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X75-50S
- ✓ 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 SIJ125X75-50S FAQ
Yes, the SIJ125X75-50S is discontinued. The direct replacement is the SAIJ125X75-50S, offering the same ISO 15552 interface, 125mm bore, 75mm stroke, 50mm adjust window, and G1/2 port. The SAIJ family uses an upgraded two Y-shaped one-way piston seal for longer life.
The external stop screw trims the extend stroke by up to 50mm on-site, giving a usable 25-75mm window. The stop sets end position only and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X75-50S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X75-50S replacement — usually within 7-8 hours.