This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X280-50S, 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 SIJ125X280-50S
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X280-50S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 280mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X280-50S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke280 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X280-50S
- 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 SIJ125X280-50S
The AirTAC SIJ125X280-50S is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 125mm bore and 280mm nominal stroke. An external stop screw allows you to trim the extend stroke by up to 50mm on-site, yielding a usable 230-280mm end position. The direct replacement is the SAIJ125X280-50S, retaining the same G1/2 port, M27x2 rod thread, and 40mm adjustable cushion.
The SAIJ upgrade introduces a two Y-shaped one-way piston seal for lower start-up pressure and longer life. The -S suffix denotes a built-in piston magnet for legacy CS1-B/DS1-B switches. Note that the stop screw sets the end position but is not a load lock; for held loads use an external rod lock or the SAIL/BSAI variants.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X280-50S Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X280-50S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X280-50S |
| Bore size | Ø125 mm |
| Stroke | 280 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 SAIJ125X280-50S 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 SAIJ125X280-50S 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 SIJ125X280-50S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×280 | 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 SIJ125X280-50S Is Used
Press Fit Tuning
Allows operators to dial in the exact 230-280mm extend position for pressing bearings without machining custom spacers.
Variable Length Diverter
Adjusts the extend stop on-site to accommodate changing package sizes on a sorting line within the 50mm window.
Adjustable End Stop
Provides a field-tunable physical end position for pallet positioning prior to wrapping, fine-tuned up to 50mm.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X280-50S with the SAIJ125X280-50S
To replace the discontinued SIJ125X280-50S, order the exact direct replacement SAIJ125X280-50S to reuse your existing ISO 15552 mounting interface. Choose the -50mm adjust window if your application requires field tuning the extend stroke between 230mm and 280mm; otherwise a fixed SAI cylinder is simpler. Mounting options include Basic, FA, LB, and TC. The -S magnet supports position sensing. For strokes of 300mm or longer, verify side-load limits to prevent excessive guide wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X280-50S
- ✓ 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 SIJ125X280-50S FAQ
Yes, the SIJ125X280-50S is discontinued. The direct replacement is the SAIJ125X280-50S, which matches the ISO 15552 interface, 125mm bore, 280mm stroke, 50mm adjust window, G1/2 port, and mounting hardware.
The external stop screw allows trimming the extend stroke by up to 50mm on-site, giving a usable range of 230-280mm. The stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X280-50S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X280-50S replacement — usually within 7-8 hours.