This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X300-40S, 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 SIJ125X300-40S
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X300-40S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 300mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X300-40S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke300 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X300-40S
- 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 SIJ125X300-40S
The AirTAC SIJ125X300-40S 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 260-300 mm range from the 300 mm nominal maximum. It features a G1/2 port, M27x2 rod thread, 40 mm adjustable cushions, and a -S piston magnet for legacy CS1-B/DS1-B sensors.
The direct replacement is the SAIJ125X300-40S, matching the ISO 15552 interface, force, and mounts. The SAIJ upgrade uses a two Y-shaped one-way piston seal for low start-up pressure and long life. The stop screw sets end position only; it is not a lock. For held loads use SAIL/BSAI or an external rod lock.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X300-40S Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X300-40S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X300-40S |
| Bore size | Ø125 mm |
| Stroke | 300 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 SAIJ125X300-40S 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 SAIJ125X300-40S 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 SIJ125X300-40S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×300 | 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 SIJ125X300-40S Is Used
Press Fit Tuning
Allows operators to dial in the exact 260-300 mm extend position for seating bearings without machining custom spacers.
Variable Length Diverter
Adjusts the extend stop on-site to deflect varying package sizes on a sorting line within the 40 mm trim window.
Adjustable Height Stop
Sets precise mechanical end positions for palletizing tasks, accommodating different pallet stack heights safely.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X300-40S with the SAIJ125X300-40S
To replace the discontinued SIJ125X300-40S, order the direct replacement SAIJ125X300-40S, retaining your FA, LB, or TC mounts and the G1/2 port. The 40 mm adjust window lets you fine-tune the extend end position between 260 and 300 mm. The -S suffix provides a piston magnet for CS1-B/DS1-B switches. At 300 mm stroke, use external guides to prevent rod bending and manage side loads. Remember the stop screw is not a load lock; add a pilot-operated check valve for load holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X300-40S
- ✓ 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 SIJ125X300-40S FAQ
Yes, the SIJ125X300-40S is discontinued. The direct replacement is the SAIJ125X300-40S, which shares the identical ISO 15552 interface, 300 mm stroke, 40 mm adjust window, G1/2 port, and mounting options. The SAIJ features an upgraded two Y-shaped one-way piston seal for longer life.
The external stop screw allows you to trim the extend stroke by up to 40 mm on-site, yielding a usable 260-300 mm stroke. The stop sets end position only and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X300-40S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X300-40S replacement — usually within 7-8 hours.