This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X20-20S, 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 SIJ125X20-20S
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X20-20S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 20mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X20-20S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke20 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X20-20S
- 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 SIJ125X20-20S
The AirTAC SIJ125X20-20S 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 20mm on-site, giving a usable 0-20mm window from the 20mm nominal maximum. The direct replacement is the SAIJ125X20-20S, retaining the same interface, force, and mounting.
The SAIJ successor incorporates an upgraded two-piece Y-shaped piston seal for lower start-up pressure and longer life. Remember the stop screw sets end position only; it is not a lock, and a plain cylinder drifts on air loss. For held loads, use an external rod lock or the SAIL/BSAI lock variants.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X20-20S Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X20-20S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X20-20S |
| Bore size | Ø125 mm |
| Stroke | 20 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 SAIJ125X20-20S 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 SAIJ125X20-20S 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 SIJ125X20-20S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×20 | 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 SIJ125X20-20S Is Used
Short-Stroke Clamping
Provides 6136N of clamping force at 0.5MPa with a tunable 0-20mm extend window, allowing operators to dial in the exact grip on variable thickness parts without changing fixtures.
Precise End-Stop Setting
Ideal for assemblies needing field stroke tuning where the external stop screw trims the extend stroke by up to 20mm on-site to set a rigid, accurate mechanical end position.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X20-20S with the SAIJ125X20-20S
To replace the discontinued SIJ125X20-20S, order the direct replacement SAIJ125X20-20S, which preserves the 125mm bore, 20mm nominal stroke, 0-20mm adjust window, G1/2 port, and -S magnet. Choose the 20mm adjust window if your fixture requires precise on-site end-position tuning within a short 0-20mm range. Mounting options include Basic, FA, LB, and TC using genuine ISO 15552 interface dimensions. The -S suffix ensures a piston magnet for legacy CS1-B/DS1-B switches (current AirTAC switches are used on the SAIJ). Because the 20mm stroke is under 300mm, side-load rod deflection is minimal, but always confirm guiding. The external stop screw sets the end position and is not a load lock; for load holding without live air, specify an external rod lock or pilot-operated check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X20-20S
- ✓ 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 SIJ125X20-20S FAQ
Yes, the AirTAC SIJ125X20-20S is discontinued. The direct replacement is the SAIJ125X20-20S. It shares the same ISO 15552 interface, 125mm bore, 20mm stroke, 0-20mm adjust window, G1/2 port, and mounting, but adds an upgraded piston seal.
The external stop screw allows you to trim the extend stroke by up to 20mm on-site, yielding a usable 0-20mm stroke window. The stop sets end position only and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X20-20S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X20-20S replacement — usually within 7-8 hours.