This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X500H, 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 SI125 Standard Cylinder SI125X500H
The AirTAC SI125 Standard Cylinder SI125X500H is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 500mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X500H, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke500 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X500H
- 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 SI125 Standard Cylinder SI125X500H
The AirTAC SI125X500H is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 500 mm stroke. Delivering 6136 N push force at 0.5 MPa, it features a G1/2 port, M27x2 rod thread, and a high-temperature Viton H seal rated for 0 to 150 C. The direct replacement is the SAI125X500H, matching the bore, stroke, force, port, and ISO 15552 mounting interface for seamless fixture integration.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. Without a -S magnet, this SKU cannot accept a sensor. Note that a plain cylinder drifts on air loss; for load holding, use an external pilot check valve or the SAIL/BSAI lock variants.
Airtac SI125 Standard Cylinder SI125X500H Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X500H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X500H |
| Bore size | Ø125 mm |
| Stroke | 500 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 SAI125X500H 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 SAI125X500H produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI125 Standard Cylinder SI125X500H
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×500 | 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 SI125 Standard Cylinder SI125X500H Is Used
Heavy Stamp Press Feed
Drives robust 500 mm displacement cycles into heavy stamping presses, leveraging 6136 N thrust at 0.5 MPa to shift large billets reliably.
Pallet Lift Ejection
Ejects loaded pallets from high-temp washdown zones, utilising the Viton H seal to maintain integrity up to 150 C during sustained actuation.
Large Mold Actuation
Actuates oversized molding tooling over the 500 mm travel, requiring external guide rails to prevent rod bending under substantial side loads.
Replacing the Airtac SI125 Standard Cylinder SI125X500H with the SAI125X500H
To replace the discontinued SI125X500H, order the SAI125X500H, confirming the ISO 15552 mounting interface, 125 mm bore, 500 mm stroke, G1/2 port, and Viton H high-temp seal. Because this SKU lacks a -S magnet, it cannot support position sensing; if switches are needed, select a magnet-equipped SAI. For sizing alternatives, a neighbouring 100 mm bore yields 3927 N push at 0.5 MPa, while a 160 mm bore provides 10053 N. At 500 mm stroke, prevent rod bending by guiding the load externally to avoid side-load damage. Finally, the air cushion only decelerates the piston near stroke end and does not hold load on air loss—specify an external rod lock, pilot check valve, or the SAIL/BSAI lock variants for secure holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X500H
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI125 Standard Cylinder SI125X500H FAQ
Yes, the SI125X500H is discontinued. The direct replacement is the SAI125X500H. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 500 mm stroke, 6136 N force, G1/2 port, and mounting interface. The SAI features an upgraded two Y-shaped piston seal for lower start-up pressure.
This 125 mm bore cylinder features a G1/2 port and M27x2 rod thread. The thrust ratings are: 6136 N push and 5734 N pull at 0.5 MPa; 8590 N push at 0.7 MPa; 11045 N push at 0.9 MPa; and a theoretical maximum force of 1251 kgf at 1.0 MPa. It operates at 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X500H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X500H replacement — usually within 7-8 hours.