This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X35-20S, 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 SIJ125X35-20S
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X35-20S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 35mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X35-20S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke35 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X35-20S
- 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 SIJ125X35-20S
The AirTAC SIJ125X35-20S is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 125 mm bore and 35 mm nominal stroke. An external stop screw lets you trim the extend stroke by up to 20 mm on-site, yielding a usable 15-35 mm extend window. The direct replacement is the SAIJ125X35-20S, retaining the same interface, force, and adjustability.
The SAIJ successor introduces an upgraded two-piece Y-shaped piston seal for lower start-up pressure and longer life. The -S suffix denotes a built-in piston magnet for legacy CS1-B/DS1-B switches. Note that the external stop sets the 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 SIJ125X35-20S Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X35-20S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X35-20S |
| Bore size | Ø125 mm |
| Stroke | 35 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 SAIJ125X35-20S 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 SAIJ125X35-20S 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 SIJ125X35-20S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×35 | 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 SIJ125X35-20S Is Used
Press Fit Tuning
Allows operators to dial in the exact 15-35 mm extend position for seating bearings without machining custom spacers.
Variable Depth Sealing
Adjusts the extend stroke on-site to accommodate different carton depths or lid heights during packaging changeovers.
End-of-Arm Positioning
Provides a mechanical stop for precise extend endpoints in heavy-duty 125 mm bore tooling setups requiring field stroke tuning.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X35-20S with the SAIJ125X35-20S
To replace the discontinued SIJ125X35-20S, order the exact direct replacement SAIJ125X35-20S, which preserves the 125 mm bore, 35 mm nominal stroke, 20 mm adjust window, G1/2 port, and ISO 15552 mounting interfaces (Basic, FA, LB, TC, FTC, TCM1, TCM2). Choose the 20 mm adjust window if your assembly requires field tuning of the extend stroke between 15 and 35 mm. Because this model includes the -S magnet, you can mount legacy CS1-B/DS1-B sensors. Since the stroke is under 300 mm, side-load deflection is minimal, but always verify rod alignment. The stop screw defines the end position and does not hold loads on air loss.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X35-20S
- ✓ 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 SIJ125X35-20S FAQ
Yes, the SIJ125X35-20S is discontinued. The direct replacement is the SAIJ125X35-20S. It shares the same ISO 15552 interface, 125 mm bore, 35 mm stroke, 20 mm adjust window, G1/2 port, and mounting options, while adding an upgraded piston seal.
The external stop screw window is 20 mm, allowing you to trim the extend stroke from the 35 mm maximum down to 15 mm on-site. The stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X35-20S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X35-20S replacement — usually within 7-8 hours.