This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X170-50S, 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 SIJ125X170-50S
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X170-50S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 170mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X170-50S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke170 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X170-50S
- 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 SIJ125X170-50S
The AirTAC SIJ125X170-50S is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 125 mm bore and a 170 mm nominal stroke. An external stop screw lets you trim the extend stroke by up to 50 mm on-site, giving a usable extend window of 120-170 mm. The stop sets the end position and is not a load lock. The direct replacement is the SAIJ125X170-50S, sharing the same interface, force, and adjust window.
The SAIJ successor retains the ISO 15552 mounting interface so you can reuse existing FA, LB, or TC brackets without machining, and it upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life. This -S model includes a piston magnet for legacy CS1-B/DS1-B switches; the SAIJ replacement uses current AirTAC switches. A plain cylinder drifts on air loss, so for held loads use an external rod lock or the SAIL/BSAI lock variant.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X170-50S Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X170-50S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X170-50S |
| Bore size | Ø125 mm |
| Stroke | 170 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 SAIJ125X170-50S 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 SAIJ125X170-50S 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 SIJ125X170-50S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×170 | 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 SIJ125X170-50S Is Used
Press Fit Tuning
Trimming the extend stroke by up to 50 mm on-site allows precise press-fit depth adjustment for 125 mm bore assemblies without machining custom spacers.
Divertor Positioning
Adjusting the extend end position lets operators fine-tune a divertor arm reach on-site to accommodate varying package widths on the line.
Pallet Stop Calibration
The external stop screw provides a calibrated end position for pallet stops, enabling quick changes to the stopping distance without reprogramming logic.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X170-50S with the SAIJ125X170-50S
To replace the discontinued SIJ125X170-50S, order the direct replacement SAIJ125X170-50S, keeping the 170 mm nominal stroke and 50 mm adjust window. Choose the 50 mm adjust window when you need precise on-site end-position tuning between 120 and 170 mm; it beats adding a separate external stop to a fixed SAI cylinder because the stop screw is integrated into the end cap. Reuse your existing FA, LB, or TC ISO 15552 mounts. The -S suffix means a piston magnet is present for legacy CS1-B/DS1-B switches. For strokes of 300 mm or longer, verify your side-load limits to prevent rod bearing wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X170-50S
- ✓ 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 SIJ125X170-50S FAQ
Yes, the SIJ125X170-50S is discontinued. The direct replacement is the SAIJ125X170-50S. It shares the same ISO 15552 interface, 125 mm bore, 170 mm stroke, 50 mm adjust window, G1/2 port, and mounting options, but uses an upgraded piston seal.
The external stop screw provides a 50 mm adjust window, allowing the extend stroke to be shortened from the 170 mm maximum down to 120 mm. The stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X170-50S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X170-50S replacement — usually within 7-8 hours.