This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X300-40SFA, 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 SIJ125X300-40SFA
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X300-40SFA 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 SAIJ125X300-40SFA, 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 → SAIJ125X300-40SFA
- 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 SIJ125X300-40SFA
The AirTAC SIJ125X300-40SFA 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, yielding a usable 260-300 mm range from the 300 mm nominal maximum. It features a G1/2 port, an M27x2 rod thread, and 40 mm adjustable air cushions. The direct replacement is the SAIJ125X300-40SFA, sharing the same interface, force, and FA mounting.
The SAIJ successor introduces an upgraded two-piece Y-shaped piston seal for lower start-up pressure and longer life. The stop screw sets the end position but is not a load lock; on air loss the piston drifts. For held loads, specify an external rod lock or the SAIL/BSAI variants. The -S magnet enables legacy CS1-B/DS1-B sensors.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X300-40SFA Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X300-40SFA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X300-40SFA |
| 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 SAIJ125X300-40SFA 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 SAIJ125X300-40SFA 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 SIJ125X300-40SFA
| 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 SIJ125X300-40SFA Is Used
Press Tonnage Calibration
Fine-tune the extend contact point within a 260-300 mm window to precisely set material deflection without re-machining hard stops.
Variable-Length Diverter
Adjust the extend stroke on-site to accommodate different package sizes on a sorting line, ensuring exact push distances.
Pallet Positioning Stop
Trim the extend stroke by up to 40 mm to align varying pallet depths accurately before stretch wrapping, using the G1/2 port.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X300-40SFA with the SAIJ125X300-40SFA
To replace the discontinued SIJ125X300-40SFA, order the direct replacement SAIJ125X300-40SFA, retaining the existing ISO 15552 mounting interface and FA accessory. Choose the 40 mm adjust window if your extend stroke needs on-site tuning between 260 and 300 mm. The -S suffix confirms a piston magnet for legacy CS1-B/DS1-B switches. Because the 300 mm stroke is long, verify side-load limits and use external guides to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X300-40SFA
- ✓ 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 SIJ125X300-40SFA FAQ
Yes, the SIJ125X300-40SFA is discontinued. The direct replacement is the SAIJ125X300-40SFA, which shares the same ISO 15552 interface, 125 mm bore, 300 mm stroke, 40 mm adjust window, G1/2 port, and FA mounting. The SAIJ family also adds an upgraded piston seal.
The external stop screw trims the extend stroke by up to 40 mm on-site, giving a usable 260-300 mm range. The stop sets end position but is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X300-40SFA
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X300-40SFA replacement — usually within 7-8 hours.