This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X150-50S, 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 SIJ125X150-50S
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X150-50S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 150mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X150-50S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke150 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X150-50S
- 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 SIJ125X150-50S
The AirTAC SIJ125X150-50S is a discontinued 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 100-150 mm extension out of the 150 mm nominal maximum. The direct replacement is the SAIJ125X150-50S, sharing the same interface, force, and mounting.
The SAIJ successor introduces an upgraded two-piece Y-shaped piston seal for lower start-up pressure and longer life. The stop screw strictly sets the end position; it is not a load lock, so use an external rod lock or SAIL/BSAI variant for held loads. The -S suffix provides a piston magnet for legacy CS1-B/DS1-B switches.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X150-50S Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X150-50S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X150-50S |
| Bore size | Ø125 mm |
| Stroke | 150 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 SAIJ125X150-50S 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 SAIJ125X150-50S 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 SIJ125X150-50S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×150 | 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 SIJ125X150-50S Is Used
Press Fit Tuning
Adjusting the extend stop on-site by up to 50 mm allows operators to dial in precise press-fit depths for varying bearing housings without swapping cylinders.
Variable Carton Flaps
Trimming the extend stroke from 150 mm down to 100 mm accommodates different carton sizes on a packaging line, ensuring consistent sealing pressure.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X150-50S with the SAIJ125X150-50S
To replace the SIJ125X150-50S, order the exact direct replacement SAIJ125X150-50S. The 50 mm adjust window is ideal if your end-stop varies by less than 50 mm; for longer trims, pick a larger adjust figure. Mounting interfaces (Basic, FA, LB, TC) transfer directly. The -S magnet enables legacy CS1-B/DS1-B sensors. For this 150 mm stroke, side-load is moderate, but for any stroke >=300 mm ensure guide alignment to prevent rod seal wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X150-50S
- ✓ 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 SIJ125X150-50S FAQ
Yes, the SIJ125X150-50S is discontinued. The direct replacement is the SAIJ125X150-50S, which shares the same ISO 15552 interface, 150 mm stroke, 50 mm adjust window, G1/2 port, and 125 mm bore force.
The external stop screw provides a 50 mm adjust window, shortening the 150 mm nominal extend stroke down to 100 mm. The stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X150-50S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X150-50S replacement — usually within 7-8 hours.