This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X770SH, 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 SI125X770SH
The AirTAC SI125 Standard Cylinder SI125X770SH is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 770mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X770SH, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke770 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X770SH
- 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 SI125X770SH
The AirTAC SI125X770SH is a discontinued double-acting ISO 15552 profile cylinder with a 125mm bore and 770mm stroke. It delivers 6136N push force at 0.5MPa via a G1/2 port. AirTAC replaced this legacy unit with the SAI125X770SH, a direct sharing the exact ISO 15552 mounting interface, bore, stroke, output force, and port size. The SAI features an upgraded piston seal using two Y-shaped one-way elements for low start-up pressure and long life.
This -S/-H configuration includes a piston magnet for legacy CS1-B/DS1-B switches and a Viton H seal rated for 0-150C. The SAI family also adds SAIL, SAIF, and BSAI lock variants absent in the SI line.
Airtac SI125 Standard Cylinder SI125X770SH Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X770SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X770SH |
| Bore size | Ø125 mm |
| Stroke | 770 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 SAI125X770SH 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 SAI125X770SH 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 SI125X770SH
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×770 | 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 SI125X770SH Is Used
Heavy Stamping Press
Drives large press dies requiring 6136N push force at 0.5MPa, utilizing the adjustable 40mm air cushions to absorb heavy end-of-stroke impacts.
Pallet Lift Gate
Raises loaded pallets vertically; the 770mm stroke provides the necessary travel, though external guides are critical to prevent rod side-load bending.
High-Temp Ejection
Ejects molded parts near ovens, leveraging the Viton H seal for 0-150C heat resistance while the magnet enables position confirmation.
Replacing the Airtac SI125 Standard Cylinder SI125X770SH with the SAI125X770SH
To replace the SI125X770SH, order the SAI125X770SH. Verify your ISO 15552 mounting accessory (LB, FA, TC, etc.), the G1/2 port, and the M27x2 rod thread. Because this is a long 770mm stroke, use an external guide to prevent rod bending and side-load damage. If you need to hold the load on air loss, note that a plain cylinder drifts; the air cushion only decelerates near stroke end. Use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. For higher force, the 160mm bore offers 10053N at 0.5MPa; for less, the 100mm bore provides 3927N.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X770SH
- ✓ 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 SI125X770SH FAQ
Yes, the SI125X770SH is discontinued. The direct replacement is the SAI125X770SH. It shares the same ISO 15552 mounting interface, 125mm bore, 770mm stroke, G1/2 port, and force ratings, fitting directly into existing fixtures.
It has a G1/2 air port. The force ratings are: 6136N push and 5734N pull at 0.5MPa; 8590N push at 0.7MPa; 11045N push at 0.9MPa; and a theoretical maximum of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X770SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X770SH replacement — usually within 7-8 hours.