This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X80-50STC, 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 SIJ125X80-50STC
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X80-50STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 80mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X80-50STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke80 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X80-50STC
- 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 SIJ125X80-50STC
The AirTAC SIJ125X80-50STC is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder. Its external stop screw lets you trim the extend stroke by up to 50 mm on-site, giving a usable 30-80 mm extend out of the 80 mm nominal maximum. The direct replacement is the SAIJ125X80-50STC, matching the bore, force, adjust window, and TC mounting interface.
The SAIJ successor retains the ISO 15552 mounting dimensions so your existing brackets reuse directly, while upgrading to a two-piece Y-shaped 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.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X80-50STC Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X80-50STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X80-50STC |
| Bore size | Ø125 mm |
| Stroke | 80 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 SAIJ125X80-50STC 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 SAIJ125X80-50STC 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 SIJ125X80-50STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×80 | 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 SIJ125X80-50STC Is Used
Press Fit Tuning
Allows on-site extend stroke adjustment up to 50 mm to set precise pressing depth for varied bearing housings without swapping cylinders.
Variable Diverter Stroke
Trimming the extend stroke dynamically sets the pusher distance to route different carton widths on a packaging conveyor line.
Adjustable Pallet Stop
Sets the physical end-stop position for pallets on a roller bed, allowing 30 to 80 mm of field adjustment to accommodate pallet length variations.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X80-50STC with the SAIJ125X80-50STC
To replace the discontinued SIJ125X80-50STC, order the direct replacement SAIJ125X80-50STC, keeping the 80 mm nominal stroke, 50 mm adjust window, -S magnet, and TC mount. Choose the 50 mm adjust window if your end-position needs field tuning between 30 and 80 mm. The TC mount provides a trunnion interface for pivoting. The -S suffix means a piston magnet is present for legacy CS1-B/DS1-B switches. For strokes of 300 mm or longer, verify side-load limits to prevent rod binding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X80-50STC
- ✓ 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 SIJ125X80-50STC FAQ
Yes, the SIJ125X80-50STC is discontinued. The direct replacement is the SAIJ125X80-50STC. It shares the identical ISO 15552 interface, 125 mm bore, 80 mm stroke, 50 mm adjust window, G1/2 port, and TC mounting, but uses an upgraded two-piece Y-shaped piston seal.
The external stop screw allows you to trim the extend stroke by up to 50 mm on-site, yielding a usable 30-80 mm stroke. The stop sets end position only; it is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X80-50STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X80-50STC replacement — usually within 7-8 hours.