This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X250-50, 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 SIJ125X250-50
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X250-50 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 250mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X250-50, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke250 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X250-50
- 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 SIJ125X250-50
The AirTAC SIJ125X250-50 is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder. An external stop screw lets you trim the extend stroke by up to 50 mm on-site, giving a usable 200-250 mm range. The direct replacement is the SAIJ125X250-50, matching the 125 mm bore, port, and force.
The SAIJ successor retains the ISO 15552 mounting interface and adds an upgraded two-piece Y-shaped piston seal for lower start-up pressure. Note this SKU lacks a -S magnet and cannot accept sensing switches. The stop screw sets end position only; it is not a lock, so use an external rod lock for held loads.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X250-50 Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X250-50 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X250-50 |
| Bore size | Ø125 mm |
| Stroke | 250 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 SAIJ125X250-50 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 SAIJ125X250-50 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 SIJ125X250-50
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×250 | 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 SIJ125X250-50 Is Used
Press Fit Tuning
Adjusting the extend stop on-site by up to 50 mm allows operators to dial in precise press-fit depths for large bearings without re machining hard stops.
Variable Length Diverter
A packaging line diverter uses the 200-250 mm stroke window to deflect different carton widths on the fly, trimming the extend stroke as needed.
Pallet Positioning Stop
Heavy pallet stops require field stroke tuning to accommodate variable load overhang; the external screw sets the exact 200-250 mm end position.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X250-50 with the SAIJ125X250-50
To replace the SIJ125X250-50, order the SAIJ125X250-50, which is a direct for the ISO 15552 interface, 250 mm stroke, 50 mm adjust window, and G1/2 port. Select the 50 mm adjust window if your end-position needs field tuning between 200 and 250 mm. Mounting choices include FA, LB, and TC. Because this SKU has no -S suffix, it cannot accept magnetic switches. For this 250 mm stroke, ensure your mechanical setup accounts for side-load to prevent premature seal wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X250-50
- ✓ 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 SIJ125X250-50 FAQ
Yes, the SIJ125X250-50 is discontinued. The direct replacement is the SAIJ125X250-50. It matches the ISO 15552 interface, 125 mm bore, 250 mm stroke, 50 mm adjust window, and G1/2 port. The SAIJ family also adds an upgraded piston seal and lock variants the SIJ lacked.
The external stop screw window is 50 mm, allowing you to trim the extend stroke from the 250 mm maximum down to 200 mm on-site. The stop sets end position only and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X250-50
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X250-50 replacement — usually within 7-8 hours.