This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X75H, 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 SI125X75H
The AirTAC SI125 Standard Cylinder SI125X75H is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 75mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X75H, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke75 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X75H
- 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 SI125X75H
The AirTAC SI125X75H is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 75 mm stroke. It delivers 6136 N push force at 0.5 MPa and features a G1/2 port, M27x2 rod thread, and a high-temperature Viton H seal rated for 0 to 150 C. Because this legacy SI unit is end-of-life, you should order the SAI125X75H direct replacement, which matches the exact ISO 15552 mounting interface, bore, stroke, force, and port size.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. Note this SKU lacks a magnet, so it cannot accept CS1-B/DS1-B sensors. The SAI family also adds SAIL, SAIF, and BSAI lock variants the SI lacked.
Airtac SI125 Standard Cylinder SI125X75H Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X75H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X75H |
| Bore size | Ø125 mm |
| Stroke | 75 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 SAI125X75H 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 SAI125X75H 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 SI125X75H
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×75 | 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 SI125X75H Is Used
Heavy Stamping Press
Drives large platens and stamping dies requiring 6136 N push force at 0.5 MPa, utilizing the 75 mm stroke for rapid high-impact actuation.
High-Temperature Ejector
Ejects cast or heated molded parts in environments up to 150 C, relying on the Viton H high-temperature seal to maintain integrity.
Pallet Stopper Gate
Acts as a heavy-duty blocking stop for large loaded pallets, safely halting loads up to the 3682 N safe working limit.
Replacing the Airtac SI125 Standard Cylinder SI125X75H with the SAI125X75H
To replace the SI125X75H, order the SAI125X75H. Confirm the ISO 15552 mounting interface, the 125 mm bore, the 75 mm stroke, and the G1/2 port. Retain your existing mounting accessory (LB, FA, TC, etc.) and note that this non-magnetic SKU cannot take a sensor. If you need more force, the neighboring 160 mm bore offers 10053 N push at 0.5 MPa; if less is acceptable, the 100 mm bore provides 3927 N. Because this plain cylinder does not hold load without live air, use an external pilot check valve or the SAIL/BSAI lock variant for safety. The cushion only decelerates near stroke end.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X75H
- ✓ 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 SI125X75H FAQ
Yes, the AirTAC SI125X75H is discontinued. The direct replacement is the SAI125X75H. It shares the identical ISO 15552 mounting interface, 125 mm bore, 75 mm stroke, G1/2 port, and output force, fitting existing fixtures perfectly.
This double-acting cylinder has a G1/2 port. It delivers 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.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X75H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X75H replacement — usually within 7-8 hours.