This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X600-50S, 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 SIJ125X600-50S
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X600-50S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 600mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X600-50S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke600 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X600-50S
- 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 SIJ125X600-50S
The AirTAC SIJ125X600-50S is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 125 mm bore and 600 mm maximum stroke. An external stop screw lets you trim the extend stroke by up to 50 mm on-site, yielding a usable 550-600 mm window. The bore dictates a G1/2 port, M27x2 rod thread, and 40 mm adjustable cushions. The direct replacement is the SAIJ125X600-50S, retaining the ISO 15552 mounting interface, bore, force, and adjust window.
The SAIJ successor incorporates an upgraded piston seal utilizing two Y-shaped one-way elements for low start-up pressure and extended life. The -S suffix denotes a piston magnet for legacy CS1-B/DS1-B switches. Remember the stop screw sets end position only; it is not a load lock, so use an external rod lock for held loads.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X600-50S Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X600-50S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X600-50S |
| Bore size | Ø125 mm |
| Stroke | 600 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 SAIJ125X600-50S 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 SAIJ125X600-50S 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 SIJ125X600-50S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×600 | 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 SIJ125X600-50S Is Used
Press Fit Tuning
Final insertion depth of bearings requires field stroke tuning. The 50 mm adjust window trims the 600 mm extend to dial in the exact press fit without re-mounting the actuator.
Variable Length Diverter
A diverting gate handling mixed package sizes needs adjustable reach. The external stop screw modifies the extend endpoint on-site to match varying conveyor product profiles.
Adjustable Pallet Stop
End-of-line pallet stops occasionally require repositioning for different pallet depths. The adjustable stroke allows operators to shorten the extend by up to 50 mm to accommodate new formats.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X600-50S with the SAIJ125X600-50S
To replace the discontinued SIJ125X600-50S, order the direct replacement SAIJ125X600-50S, which preserves the G1/2 port, 600 mm nominal stroke, 50 mm adjust window, and ISO 15552 mounting. Choose the 50 mm adjust window if your extend endpoint needs field tuning between 550 and 600 mm. Mounting options include FA, LB, and TC. The -S magnet supports legacy CS1-B/DS1-B sensors. Because the 600 mm stroke exceeds 300 mm, account for side-load and rod-bending forces by using external guides to prevent premature seal wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X600-50S
- ✓ 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 SIJ125X600-50S FAQ
Yes, the SIJ125X600-50S is discontinued. The direct replacement is the SAIJ125X600-50S. It shares the identical ISO 15552 interface, 125 mm bore, 600 mm stroke, 50 mm adjust window, G1/2 port, and mounting, but adds an upgraded piston seal.
The theoretical max is 1251 kgf at 1.0 MPa. The external stop screw provides a 50 mm adjust window, allowing the 600 mm extend stroke to be shortened to 550 mm on-site. The stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X600-50S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X600-50S replacement — usually within 7-8 hours.