This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X300-75S, 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 SIJ125X300-75S
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X300-75S 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 SAIJ125X300-75S, 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 → SAIJ125X300-75S
- 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 SIJ125X300-75S
The AirTAC SIJ125X300-75S 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 75 mm on-site, yielding a usable 225-300 mm window from the 300 mm nominal maximum. The direct replacement is the SAIJ125X300-75S, matching the interface, bore, force, and mounting.
The SAIJ successor retains the ISO 15552 mounting footprint for direct hardware reuse and upgrades to a two Y-shaped one-way piston seal for lower start-up pressure and longer life. The stop screw sets the end position but is not a lock; loads drift on air loss, so use an external rod lock or SAIL/BSAI variant for holding. The -S suffix provides a piston magnet for legacy CS1-B/DS1-B sensors.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X300-75S Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X300-75S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X300-75S |
| 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 SAIJ125X300-75S 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 SAIJ125X300-75S 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 SIJ125X300-75S
| 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 SIJ125X300-75S Is Used
Press Fit Tuning
Allows on-site extend stroke adjustment up to 75 mm to set precise pressing depth without swapping cylinders.
Variable Stop Positioning
Trims the extend stroke to alter the end stop location for different product lengths on a packaging line.
Adjustable Ejector Stroke
Shortens the extend stroke on-site to match varying container depths while maintaining full retract travel.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X300-75S with the SAIJ125X300-75S
To replace the discontinued SIJ125X300-75S, specify the SAIJ125X300-75S, which is a direct keeping the 125 mm bore, 300 mm stroke, 75 mm adjust window, and G1/2 port. Choose the 75 mm adjust window if your extend stroke needs on-site tuning between 225-300 mm. Mounting choices include Basic, FA, LB, and TC brackets. The -S suffix ensures a piston magnet is present for legacy CS1-B/DS1-B switches. Because the 300 mm stroke is relatively long, verify side-load conditions and use external guides to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X300-75S
- ✓ 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 SIJ125X300-75S FAQ
Yes, the SIJ125X300-75S is discontinued. The direct replacement is the SAIJ125X300-75S. It shares the same ISO 15552 interface, 125 mm bore, 300 mm stroke, 75 mm adjust window, G1/2 port, and mounting options, but features an upgraded two Y-shaped one-way piston seal.
The external stop screw allows you to trim the extend stroke by up to 75 mm on-site, giving a usable 225-300 mm window. The stop sets end position but is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X300-75S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X300-75S replacement — usually within 7-8 hours.