This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X50-30S, 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 SIJ125X50-30S
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X50-30S 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 SAIJ125X50-30S, 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 → SAIJ125X50-30S
- 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 SIJ125X50-30S
The AirTAC SIJ125X50-30S 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 30 mm on-site, giving a usable 20-50 mm extend range from the 50 mm nominal maximum. This stop sets the end position and is not a load lock.
The direct replacement is the SAIJ125X50-30S, retaining the ISO 15552 mounting interface, M27x2 rod thread, and 40 mm cushions. The SAIJ family upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X50-30S Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X50-30S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X50-30S |
| 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 SAIJ125X50-30S 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 SAIJ125X50-30S 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 SIJ125X50-30S
| 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 SIJ125X50-30S Is Used
Press Fit Tuning
Dial in the exact 20-50 mm insertion depth of a bearing on-site using the 30 mm stop screw window to compensate for fixture tolerances.
Variable Carton Sealing
Adjust the extend stroke dynamically for mixed carton heights, setting the precise end position without reprogramming the motion controller.
Clamp Position Setup
Trim the extend stroke by up to 30 mm on-site to set the exact clamping reach for varying part widths in a machining cell.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X50-30S with the SAIJ125X50-30S
To replace the discontinued SIJ125X50-30S, order the direct replacement SAIJ125X50-30S; it keeps the exact 50 mm stroke, 30 mm adjust window, G1/2 port, and FA/LB/TC mounts. Choose the 30 mm adjust window when you need on-site tuning between 20 and 50 mm. The -S suffix means a piston magnet is present for CS1-B/DS1-B switches. For stroke lengths at or above 300 mm, verify side-load limits to prevent guide wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X50-30S
- ✓ 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 SIJ125X50-30S FAQ
Yes, the SIJ125X50-30S is discontinued. The direct replacement is the SAIJ125X50-30S. It shares the identical ISO 15552 interface, 125 mm bore, 50 mm nominal stroke, 30 mm adjust window, and G1/2 port, but adds an upgraded two Y-shaped one-way piston seal.
The external stop screw provides a 30 mm adjust window, shortening the 50 mm extend stroke down to 20 mm. The stop sets end position only; it is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X50-30S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X50-30S replacement — usually within 7-8 hours.