This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X800-20S, 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 SIJ125X800-20S
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X800-20S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 800mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X800-20S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke800 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X800-20S
- 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 SIJ125X800-20S
The AirTAC SIJ125X800-20S is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 125 mm bore and 800 mm maximum stroke. An external stop screw lets you trim the extend stroke by up to 20 mm on-site, yielding a usable 780-800 mm stroke. The direct replacement is the SAIJ125X800-20S, matching the bore, force, adjust window, and mounting.
The SAIJ successor retains the ISO 15552 interface and adds an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. Note the stop screw sets end position but is not a load lock; use an external rod lock for holding.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X800-20S Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X800-20S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X800-20S |
| Bore size | Ø125 mm |
| Stroke | 800 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 SAIJ125X800-20S 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 SAIJ125X800-20S 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 SIJ125X800-20S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×800 | 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 SIJ125X800-20S Is Used
Press Tooling Adjustment
Trimming the 800 mm extend stroke by up to 20 mm on-site allows operators to fine-tune press tooling contact without machining custom spacers.
Pallet Positioning Stops
The external stop screw provides a hardened mechanical end position for varying pallet sizes, ensuring repeatable stops within the 780-800 mm window.
Long-Reach Diverters
Ideal for diverter arms requiring a long 800 mm reach where the exact stopping point must be dialed in precisely to match package dimensions.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X800-20S with the SAIJ125X800-20S
To replace the discontinued SIJ125X800-20S, order the direct replacement SAIJ125X800-20S, which preserves the ISO 15552 mounting interface, G1/2 port, and 20 mm adjust window. Choose the 20 mm adjust window if you need precise 780-800 mm extend endpoint tuning on-site. Mounting options include FA, LB, and TC brackets. The -S suffix indicates a built-in piston magnet for legacy CS1-B/DS1-B switches (the SAIJ uses current AirTAC switches). Because the stroke is 800 mm, ensure external guides are used to prevent rod bending and manage side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X800-20S
- ✓ 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 SIJ125X800-20S FAQ
Yes, the SIJ125X800-20S is discontinued. The direct replacement is the SAIJ125X800-20S. It shares the same ISO 15552 interface, 125 mm bore, 800 mm stroke, 20 mm adjust window, G1/2 port, and mounting options, while adding an upgraded piston seal.
The external stop screw allows you to trim the extend stroke by up to 20 mm on-site (usable stroke 780-800 mm). The stop sets end position but is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X800-20S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X800-20S replacement — usually within 7-8 hours.