This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X50-30STC, 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 SIJ125X50-30STC
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X50-30STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 50mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X50-30STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke50 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X50-30STC
- 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 SIJ125X50-30STC
The AirTAC SIJ125X50-30STC is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 125 mm bore, 50 mm nominal stroke, and a 30 mm on-site extend-trim window (yielding a 20-50 mm usable stroke). An external stop screw shortens the extend stroke by up to 30 mm, setting the precise end position. The direct replacement is the SAIJ125X50-30STC, matching the ISO 15552 interface, force, and TC mounting.
The SAIJ successor retains the adjustable cushion (40 mm) and speed range (30-500 mm/s) while upgrading to a two Y-shaped one-way piston seal for lower start-up pressure and longer life. Note the stop screw sets end position but is not a load lock; for held loads use an external rod lock or SAIL/BSAI variant.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X50-30STC Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X50-30STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X50-30STC |
| Bore size | Ø125 mm |
| Stroke | 50 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 SAIJ125X50-30STC 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 SAIJ125X50-30STC 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 SIJ125X50-30STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×50 | 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 SIJ125X50-30STC Is Used
Press Fit Tuning
Trimming the extend stroke by up to 30 mm on-site allows operators to dial in the exact insertion depth for bearing press fits without swapping cylinders.
Variable Carton Flap Folding
Adjusting the extend end position on the fly accommodates different carton depths, ensuring precise flap folding without repositioning the entire fixture.
Component Seating Stops
Setting a hard mechanical end position via the stop screw guarantees consistent component seating against a surface, preventing over-travel in assembly lines.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X50-30STC with the SAIJ125X50-30STC
To replace the discontinued SIJ125X50-30STC, specify SAIJ125X50-30STC for an direct match. Select the 30 mm adjust window if your application requires trimming the 50 mm nominal extend stroke down to a 20 mm minimum. The TC mounting accessory is present for ISO 15552 interface reuse. The -S suffix indicates a built-in piston magnet for legacy CS1-B/DS1-B switches (current AirTAC switches are used on the SAIJ). Since the 50 mm stroke is under 300 mm, side-load rod deflection is minimal. Remember, the stop screw is not a lock; for load holding without live air, specify an external rod lock or pilot-operated check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X50-30STC
- ✓ 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 SIJ125X50-30STC FAQ
Yes, the AirTAC SIJ125X50-30STC is discontinued. The direct replacement is the SAIJ125X50-30STC, which shares the same ISO 15552 interface, 125 mm bore, 50 mm nominal stroke, 30 mm adjust window, G1/2 port, and TC mounting.
The external stop screw window is 30 mm, allowing the 50 mm nominal extend stroke to be shortened to a 20 mm minimum on-site. The stop sets end position but is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X50-30STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X50-30STC replacement — usually within 7-8 hours.