This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X250-40, 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 SIJ125X250-40
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X250-40 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 SAIJ125X250-40, 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 → SAIJ125X250-40
- 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 SIJ125X250-40
The AirTAC SIJ125X250-40 is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder. Its external stop screw lets you trim the extend stroke by up to 40 mm on-site, giving a usable 210-250 mm window from the 250 mm nominal maximum.
The direct replacement is the SAIJ125X250-40, retaining the ISO 15552 mounting interface, bore, force, and adjust window. The SAIJ upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X250-40 Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X250-40 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X250-40 |
| 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 SAIJ125X250-40 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 SAIJ125X250-40 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 SIJ125X250-40
| 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 SIJ125X250-40 Is Used
Press Fit Tuning
Allows operators to dial in the exact 210-250 mm extend position for inserting bearings without changing hard stops on the machine frame.
Variable Length Diverter
Provides adjustable stroke for routing differently sized cartons on a packaging line, trimming the extend by up to 40 mm on-site.
Adjustable Pallet Stop
Sets precise end positions for pallets of varying widths, using the stop screw to shorten the extend stroke as needed.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X250-40 with the SAIJ125X250-40
To replace the discontinued SIJ125X250-40, order the direct replacement SAIJ125X250-40, which preserves the 40 mm adjust window, 250 mm nominal stroke, G1/2 port, and ISO 15552 mounting. Choose the 40 mm adjust window when you need precise 210-250 mm extend tuning without machining; a fixed SAI plus external stop lacks this integrated field flexibility. Reuse FA, LB, or TC mounts directly. This SKU lacks the -S magnet, so it cannot take a magnetic switch; add external sensors if needed. For strokes at or over 300 mm, verify side-load guidance to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X250-40
- ✓ 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 SIJ125X250-40 FAQ
Yes, the SIJ125X250-40 is discontinued. The direct replacement is the SAIJ125X250-40, which matches the ISO 15552 interface, 125 mm bore, 250 mm stroke, 40 mm adjust window, and G1/2 port.
The external stop screw provides a 40 mm trim window, allowing the extend stroke to be shortened from 250 mm down to 210 mm on-site. Note that the stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X250-40
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X250-40 replacement — usually within 7-8 hours.