This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X275-50, 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 SIJ125X275-50
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X275-50 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 275mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X275-50, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke275 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X275-50
- 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 SIJ125X275-50
The AirTAC SIJ125X275-50 is a discontinued double-acting double-rod adjustable-stroke ISO 15552 cylinder. An external stop screw lets you trim the extend stroke by up to 50 mm on-site, yielding a usable 225-275 mm extend out of the 275 mm nominal maximum. It features a 32 mm rod, M27x2 rod-end thread, 40 mm adjustable air cushions, a G1/2 port, and operates at 30-500 mm/s.
The direct replacement is the SAIJ125X275-50, retaining the same ISO 15552 mounting interface, bore, stroke, force, and port. The SAIJ family introduces an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. This SKU has no -S magnet and cannot accept a sensor.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X275-50 Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X275-50 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X275-50 |
| Bore size | Ø125 mm |
| Stroke | 275 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 SAIJ125X275-50 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 SAIJ125X275-50 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 SIJ125X275-50
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×275 | 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 SIJ125X275-50 Is Used
Press Fit Tuning
Allows operators to fine-tune the 225-275 mm extend position on-site for pressing bearings without machining custom spacers.
Variable Length Diverter
Adjusts the extend stop to deflect different package sizes on a conveyor line, providing precise routing without reprogramming.
Adjustable Height Stop
Sets a physical end-stop for pallet positioning, trimming the extend stroke by up to 50 mm to accommodate varying pallet dimensions.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X275-50 with the SAIJ125X275-50
To replace the discontinued SIJ125X275-50, order the direct replacement SAIJ125X275-50. It preserves the 275 mm maximum stroke and the 50 mm on-site adjust window (allowing you to set the extend end-position anywhere from 225 to 275 mm). You can reuse existing FA, LB, or TC ISO 15552 mounting fixtures. Because this SKU lacks the -S suffix, it cannot accept a magnetic piston switch. For strokes of 300 mm or longer, verify your side-load limits to prevent guide bushing wear. Remember the external stop screw sets the end position but is not a load lock; for held loads, use an external rod lock or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X275-50
- ✓ 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 SIJ125X275-50 FAQ
Yes, the SIJ125X275-50 is discontinued. The direct replacement is the SAIJ125X275-50. It shares the same ISO 15552 interface, 125 mm bore, 275 mm stroke, 50 mm adjust window, G1/2 port, and force ratings. The SAIJ family also adds an upgraded piston seal for longer life.
The external stop screw provides a 50 mm adjust window, allowing the extend stroke to be shortened from the 275 mm maximum down to 225 mm. The stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X275-50
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X275-50 replacement — usually within 7-8 hours.