This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X175-50S, 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 SIJ125X175-50S
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X175-50S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 175mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X175-50S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke175 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X175-50S
- 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 SIJ125X175-50S
The AirTAC SIJ125X175-50S is a double-acting double-rod ISO 15552 adjustable-stroke cylinder. An external stop screw lets you trim the extend stroke by up to 50 mm on-site, giving a usable 125-175 mm window from the 175 mm nominal maximum. The -S suffix denotes a built-in piston magnet for legacy CS1-B/DS1-B switches.
This SIJ series is discontinued; the direct replacement is the SAIJ125X175-50S, preserving the ISO 15552 mounting interface, force, and adjustability. The SAIJ upgrade introduces a two Y-shaped one-way piston seal for lower start-up pressure and longer life. Note the stop screw sets end position only—it is not a load lock; use SAIL or BSAI variants for held loads.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X175-50S Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X175-50S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X175-50S |
| Bore size | Ø125 mm |
| Stroke | 175 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 SAIJ125X175-50S 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 SAIJ125X175-50S 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 SIJ125X175-50S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×175 | 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 SIJ125X175-50S Is Used
Press Fit Tuning
Final insertion depth of bearings requires field adjustment; the 50 mm stop window allows operators to dial in the exact 125-175 mm extend position without changing the cylinder.
Variable Length Diverter
A sorting arm diverting mixed package lengths on a line uses the external stop to set the extend endpoint on-site, adapting the stroke window for different product runs.
Adjustable Sealing Head
A packaging station sealing various container heights uses the adjustable stop to trim the extend stroke, ensuring precise contact without re-engineering the fixture.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X175-50S with the SAIJ125X175-50S
To replace the discontinued SIJ125X175-50S, specify SAIJ125X175-50S directly—it is a direct swap retaining the 125 mm bore, 175 mm nominal stroke, 50 mm adjust window, G1/2 port, and -S magnet. Choose the 50 mm adjust window if your end-of-stroke positioning needs field tuning between 125 and 175 mm. Mounting options include Basic, FA, LB, and TC using genuine ISO 15552 interface dimensions. For strokes of 300 mm or longer, verify side-load limits to prevent rod binding. The -S magnet supports legacy CS1-B/DS1-B switches (current AirTAC switches are used on the SAIJ).
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X175-50S
- ✓ 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 SIJ125X175-50S FAQ
Yes, the SIJ125X175-50S is discontinued. The direct replacement is the SAIJ125X175-50S. It shares the identical ISO 15552 interface, 125 mm bore, 175 mm stroke, 50 mm adjust window, G1/2 port, and mounting options. The SAIJ upgrade features a two Y-shaped one-way piston seal for longer life and lower start-up pressure.
The external stop screw shortens the extend stroke by up to 50 mm on-site, yielding a usable 125-175 mm window. The stop sets end position only and is not a load lock; for load holding on air loss, use an external rod lock or SAIL/BSAI variant.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X175-50S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X175-50S replacement — usually within 7-8 hours.