This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X450-40S, 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 SIJ125X450-40S
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X450-40S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 450mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X450-40S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke450 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X450-40S
- 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 SIJ125X450-40S
The AirTAC SIJ125X450-40S 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 40 mm on-site, giving a usable 410-450 mm window from the 450 mm nominal maximum. It features a 32 mm rod, M27x2 thread, G1/2 port, and 40 mm adjustable cushions. The direct replacement is the SAIJ125X450-40S, matching the interface, force, and port.
The stop screw sets the end position but is not a load lock; use an external rod lock or SAIL/BSAI variant for held loads. The SAIJ upgrade adds a two Y-shaped one-way piston seal for lower start-up pressure and longer life. The -S suffix provides a piston magnet for legacy CS1-B/DS1-B switches.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X450-40S Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X450-40S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X450-40S |
| Bore size | Ø125 mm |
| Stroke | 450 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 SAIJ125X450-40S 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 SAIJ125X450-40S 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 SIJ125X450-40S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×450 | 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 SIJ125X450-40S Is Used
Press Fit Tuning
Final insertion depth of bearings requires field stroke tuning; trim the extend stroke by up to 40 mm on-site to perfect the press fit without changing the fixture.
Variable Package Divert
A divert actuator handling mixed carton widths needs precise end positions; the 40 mm adjust window lets operators set the exact reach on the floor.
Pallet Stop Adjustment
Pallet stops on a 125 mm bore ISO 15552 cylinder can be dialed in exactly; shorten the 450 mm extend stroke by up to 40 mm to accommodate varying pallet overhang.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X450-40S with the SAIJ125X450-40S
To replace the discontinued SIJ125X450-40S, order the direct replacement SAIJ125X450-40S; it preserves the 450 mm stroke, 40 mm adjust window, G1/2 port, and ISO 15552 mounting. Choose the 40 mm adjust window if your field tuning requires trimming the extend stroke by up to 40 mm. Mounting choices include Basic, FA, LB, and TC. The -S suffix confirms a piston magnet is present. Because the 450 mm stroke is long, account for rod bending and use external guides to manage side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X450-40S
- ✓ 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 SIJ125X450-40S FAQ
Yes, the SIJ125X450-40S is discontinued. The direct replacement is the SAIJ125X450-40S. It matches the ISO 15552 interface, 125 mm bore, 450 mm stroke, 40 mm adjust window, G1/2 port, and mounting. The SAIJ family also uses an upgraded two Y-shaped one-way piston seal for longer life.
The external stop screw window is 40 mm, allowing you to trim the 450 mm extend stroke down to 410 mm on-site. The stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X450-40S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X450-40S replacement — usually within 7-8 hours.