This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X170-50, 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 SIJ125X170-50
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X170-50 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 SAIJ125X170-50, 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 → SAIJ125X170-50
- 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 SIJ125X170-50
The AirTAC SIJ125X170-50 is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder. It features a 125 mm bore, a nominal 170 mm stroke, and a G1/2 port. An external stop screw lets you trim the extend stroke by up to 50 mm on-site, yielding a usable 120-170 mm extension. The stop sets the end position but is not a load lock; the piston drifts on air loss. For load holding use an external rod lock or the SAIL/BSAI variants.
The direct replacement is the SAIJ125X170-50, matching the interface, bore, force, port, and mounting. The SAIJ upgrades the piston seal to two Y-shaped one-way elements for low start-up pressure. This non-magnetic SKU cannot take a switch.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X170-50 Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X170-50 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X170-50 |
| 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 SAIJ125X170-50 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 SAIJ125X170-50 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 SIJ125X170-50
| 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 SIJ125X170-50 Is Used
Press Fit Tuning
Allows operators to dial in the exact 120-170 mm extend position for seating bearings without machining custom spacers.
Variable Length Diverter
Adjusts the extend stroke on-site to accommodate different package sizes on a sorting line.
Adjustable Pallet Stop
Provides a field-tunable hard stop for pallets of varying depths, trimming the extend up to 50 mm.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X170-50 with the SAIJ125X170-50
To replace the discontinued SIJ125X170-50, order the direct replacement SAIJ125X170-50, keeping the ISO 15552 mounting interface (Basic, FA, LB, TC) and G1/2 port. The 50 mm adjust window provides a 120-170 mm extend range; choose it if you need field tuning rather than a fixed stop. This SKU lacks the -S magnet and cannot support legacy CS1-B/DS1-B sensors. For strokes >=300 mm, verify side-load guidance to prevent rod binding. Speed is 30-500 mm/s.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X170-50
- ✓ 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 SIJ125X170-50 FAQ
Yes, the SIJ125X170-50 is discontinued. The direct replacement is the SAIJ125X170-50. It shares the same ISO 15552 interface, 125 mm bore, 170 mm nominal stroke, 50 mm adjust window, G1/2 port, and mounting. The SAIJ also uses an upgraded two Y-shaped one-way piston seal.
The external stop screw window is 50 mm, allowing you to trim the extend stroke from the 170 mm maximum down to 120 mm on-site. The stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X170-50
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X170-50 replacement — usually within 7-8 hours.