This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X250-20, 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 SIJ125X250-20
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X250-20 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 SAIJ125X250-20, 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 → SAIJ125X250-20
- 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 SIJ125X250-20
The AirTAC SIJ125X250-20 is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 125 mm bore and 250 mm maximum extend stroke. An external stop screw lets you trim the extend stroke by up to 20 mm on-site, giving a usable 230-250 mm end position.
The SAIJ upgrade introduces a two-piece Y-shaped one-way piston seal for lower start-up pressure and longer life. Note this non-magnetic SKU cannot accept a switch, and the external stop sets end position only—it is not a load lock; use an external rod lock or SAIL/BSAI variant for held loads.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X250-20 Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X250-20 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X250-20 |
| 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 SAIJ125X250-20 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 SAIJ125X250-20 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 SIJ125X250-20
| 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 SIJ125X250-20 Is Used
Press Fit Tuning
Allows operators to dial in the exact 230-250 mm extend position on-site for pressing bearings without machining custom spacers.
Product Diversion
Provides adjustable end-stops for diverter arms handling varying package sizes on a single line, trimming the stroke by up to 20 mm.
Pallet Positioning
Fine-tunes the extend reach of a pneumatically actuated pallet stop gate to accommodate different pallet depths.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X250-20 with the SAIJ125X250-20
To replace the discontinued SIJ125X250-20, order the direct replacement SAIJ125X250-20, which preserves the ISO 15552 mounting interface, 250 mm stroke, 20 mm adjust window, and G1/2 port. Choose the 20 mm adjust window if your application requires fine-tuning the extend end position within a 230-250 mm range. Mounting options include FA, LB, and TC brackets. Because this SKU lacks the -S magnet, it cannot accept legacy CS1-B/DS1-B sensors. For strokes of 300 mm or longer, verify side-load limits to prevent guide wear. The stop screw sets end position but does not hold loads on air loss.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X250-20
- ✓ 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 SIJ125X250-20 FAQ
Yes, the AirTAC SIJ125X250-20 is discontinued. The direct replacement is the SAIJ125X250-20. It shares the same ISO 15552 interface, 125 mm bore, 250 mm stroke, 20 mm adjust window, G1/2 port, and mounting options, while adding an upgraded piston seal.
This 125 mm bore cylinder has a 20 mm external stop screw window, allowing the 250 mm extend stroke to be shortened to 230 mm on-site. It operates at 30-500 mm/s and uses a G1/2 port.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X250-20
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X250-20 replacement — usually within 7-8 hours.