This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X50-50S, 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 SIJ125X50-50S
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X50-50S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 50mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X50-50S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke50 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X50-50S
- 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 SIJ125X50-50S
The AirTAC SIJ125X50-50S is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 125 mm bore and 50 mm nominal stroke. An external stop screw lets you trim the extend stroke by up to 50 mm on-site. The direct replacement is the SAIJ125X50-50S, matching the G1/2 port, M27x2 rod thread, and 40 mm adjustable cushion. The stop sets the end position but is not a load lock.
The SAIJ upgrade features a two Y-shaped one-way piston seal for low start-up pressure, and the -S suffix provides a piston magnet for legacy CS1-B/DS1-B switches.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X50-50S Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X50-50S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X50-50S |
| Bore size | Ø125 mm |
| Stroke | 50 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 SAIJ125X50-50S 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 SAIJ125X50-50S 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 SIJ125X50-50S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×50 | 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 SIJ125X50-50S Is Used
Press Fit Tuning
Allows on-site extend stroke trimming up to 50 mm to dial in exact press fit depths without swapping cylinders.
Variable Stopper Arm
Adjusts the extend position of a 125 mm bore stopper arm on the fly to handle mixed product sizes on a single line.
Pallet Positioning
Fine-tunes the extend end point for pallet alignment pins, ensuring precise seating before clamping.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X50-50S with the SAIJ125X50-50S
To replace the discontinued SIJ125X50-50S, order the direct replacement SAIJ125X50-50S, keeping the 50 mm nominal stroke and 50 mm adjust window. The stop screw sets the extend end position, not a lock; for load holding on air loss, use an external rod lock or SAIL/BSAI variant. Reuse FA, LB, or TC ISO 15552 mounts. The -S magnet suits legacy sensors. For strokes >=300 mm, verify side-load guide tolerance.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X50-50S
- ✓ 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 SIJ125X50-50S FAQ
Yes, the SIJ125X50-50S is discontinued. The direct replacement is the SAIJ125X50-50S, which shares the same ISO 15552 interface, 125 mm bore, 50 mm stroke, 50 mm adjust window, G1/2 port, and mounting options.
The external stop screw window is 50 mm, letting you shorten the 50 mm extend stroke on-site. The stop sets end position, not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X50-50S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X50-50S replacement — usually within 7-8 hours.