This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X70-50S, 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 SIJ125X70-50S
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X70-50S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 70mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X70-50S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke70 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X70-50S
- 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 SIJ125X70-50S
The AirTAC SIJ125X70-50S is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 125 mm bore and a G1/2 port. An external stop screw lets you trim the extend stroke by up to 50 mm on-site, giving a usable 20-70 mm extension out of the 70 mm nominal maximum. The stop sets the end position but is not a load lock; the piston drifts on air loss.
The direct replacement is the SAIJ125X70-50S, retaining the same interface, force, and magnet. The SAIJ upgrade uses a two Y-shaped one-way piston seal for low start-up pressure and long life. The -S suffix provides a piston magnet for legacy CS1-B/DS1-B switches.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X70-50S Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X70-50S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X70-50S |
| Bore size | Ø125 mm |
| Stroke | 70 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 SAIJ125X70-50S 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 SAIJ125X70-50S 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 SIJ125X70-50S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×70 | 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 SIJ125X70-50S Is Used
Press Fit Tuning
Trimming the extend stroke by up to 50 mm on-site allows operators to dial in the exact insertion depth for press-fit operations without machining custom spacers.
Variable Length Diverter
Adjusting the extend stop from 20 to 70 mm accommodates different package sizes on a sorting line, letting the diverter reach varying distances into the conveyor lane.
Adjustable End Stop
A pallet positioning stop that can be shortened by 50 mm on-site to handle mixed pallet heights, ensuring positive mechanical positioning at the end of travel.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X70-50S with the SAIJ125X70-50S
To replace the discontinued SIJ125X70-50S, order the direct replacement SAIJ125X70-50S, which keeps the 125 mm bore, 70 mm stroke, 50 mm adjust window, G1/2 port, and -S magnet. Choose the 50 mm adjust window if you need to trim the 20-70 mm extend stroke on-site; the stop screw sets end position but is not a lock, so for held loads use an external rod lock or SAIL/BSAI variant. Mounting interfaces include FA, LB, and TC. Because the 70 mm stroke is under 300 mm, side-load lever arm concerns are minimal. The -S magnet works with legacy CS1-B/DS1-B sensors; the SAIJ uses current AirTAC switches.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X70-50S
- ✓ 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 SIJ125X70-50S FAQ
Yes, the SIJ125X70-50S is discontinued. The direct replacement is the SAIJ125X70-50S, offering the same ISO 15552 interface, 125 mm bore, 70 mm stroke, 50 mm adjust window, G1/2 port, and -S magnet. The SAIJ upgrade features an improved two Y-shaped one-way piston seal for lower start-up pressure and longer life.
The external stop screw allows you to trim the extend stroke by up to 50 mm on-site, yielding a usable 20-70 mm extension. The stop sets end position only; it is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X70-50S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X70-50S replacement — usually within 7-8 hours.