This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X50-30SN, 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 SIJ125X50-30SN
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X50-30SN 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 SAIJ125X50-30SN, 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 → SAIJ125X50-30SN
- 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 SIJ125X50-30SN
The AirTAC SIJ125X50-30SN is a discontinued double-acting double-rod adjustable-stroke ISO 15552 cylinder. Its external stop screw trims the extend stroke by up to 30mm on-site, yielding a 20-50mm usable window from the 50mm nominal maximum. The direct replacement is the SAIJ125X50-30SN, matching the interface, force, and mounting.
The SAIJ upgrade uses a two Y-shaped one-way piston seal for low start-up pressure and long life. The stop screw sets end position but is not a load lock; use SAIL or BSAI for held loads. This -SN variant has an NBR seal (-20 to +70C) and a -S magnet for CS1-B/DS1-B sensors.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X50-30SN Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X50-30SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X50-30SN |
| 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 SAIJ125X50-30SN 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 SAIJ125X50-30SN 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 SIJ125X50-30SN
| 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 SIJ125X50-30SN Is Used
Press Fit Tuning
Allows operators to dial in the exact 20-50mm extend position for pressing bearings without machining hard stops.
Variable Carton Sealing
Adjusts the extend end-point on-site to accommodate fluctuating package heights on a packaging line.
Actuator Prototyping
Provides a 30mm trim window to test end-of-stroke positions and dwell points before finalizing a fixed-stroke design.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X50-30SN with the SAIJ125X50-30SN
To replace the discontinued SIJ125X50-30SN, use the direct replacement SAIJ125X50-30SN, retaining the exact ISO 15552 mounting interface and G1/2 port. Choose the 30mm adjust window to fine-tune the extend stroke on-site (20-50mm usable range). Mounting options include FA, LB, and TC. The -S magnet enables legacy CS1-B/DS1-B switches (current AirTAC switches on SAIJ). For this 50mm stroke, side-load concerns are minimal, but always verify rod alignment.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X50-30SN
- ✓ 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 SIJ125X50-30SN FAQ
Yes, the SIJ125X50-30SN is discontinued. The direct replacement is the SAIJ125X50-30SN, offering the same ISO 15552 interface, 125mm bore, 50mm stroke, 30mm adjust window, and G1/2 port.
The external stop screw provides a 30mm adjust window, shortening the 50mm nominal extend stroke down to 20mm. The stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X50-30SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X50-30SN replacement — usually within 7-8 hours.