This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X140-50S, 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 SIJ125X140-50S
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X140-50S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 140mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X140-50S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke140 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X140-50S
- 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 SIJ125X140-50S
The AirTAC SIJ125X140-50S is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 125 mm bore and 140 mm maximum stroke. An external stop screw lets you trim the extend stroke by up to 50 mm on-site, yielding a usable 90-140 mm extension window. The direct replacement is the SAIJ125X140-50S, matching the bore, stroke, adjust window, and mounting interface.
Upgrading to the SAIJ family retains the genuine ISO 15552 dimensions but incorporates an upgraded piston seal featuring two Y-shaped one-way elements for lower start-up pressure and longer life. Note that the external stop screw sets the end position but is not a load lock; for held loads, an external rod lock or SAIL/BSAI variant is required.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X140-50S Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X140-50S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X140-50S |
| Bore size | Ø125 mm |
| Stroke | 140 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 SAIJ125X140-50S 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 SAIJ125X140-50S 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 SIJ125X140-50S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×140 | 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 SIJ125X140-50S Is Used
Press Fit Tuning
Allows on-site extend stroke reduction up to 50 mm to dial in exact press fit depths without swapping cylinders.
Divertor Positioning
Adjusts the extend end position on-site to accommodate varying package sizes on a sorting line.
Pallet Stop Adjustment
Trims the extend stroke by up to 50 mm to adapt to different pallet footprints without repositioning mounts.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X140-50S with the SAIJ125X140-50S
To replace the discontinued SIJ125X140-50S, order the direct replacement SAIJ125X140-50S, which preserves the 50 mm adjust window, G1/2 port, and magnet for CS1-B/DS1-B switches. Choose the 50 mm adjust window if your extend stroke requires field tuning between 90 and 140 mm; for fixed strokes, a standard SAI cylinder avoids the external stop. Mounting options include FA, LB, and TC using ISO 15552 interface dimensions. Because the 140 mm stroke is below 300 mm, side-load leverage is minimal. Remember that the stop screw is not a lock; use a pilot-operated check valve for load holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X140-50S
- ✓ 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 SIJ125X140-50S FAQ
Yes, the SIJ125X140-50S is discontinued. The direct replacement is the SAIJ125X140-50S, which shares the identical ISO 15552 interface, 125 mm bore, 140 mm stroke, 50 mm adjust window, G1/2 port, and mounting options.
The external stop screw provides a 50 mm adjust window, allowing the extend stroke to be shortened from the 140 mm maximum down to 90 mm on-site. The stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X140-50S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X140-50S replacement — usually within 7-8 hours.