This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X175H, 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 SI125X175H
The AirTAC SI125 Standard Cylinder SI125X175H is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 175mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X175H, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke175 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X175H
- 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 SI125X175H
The AirTAC SI125X175H is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 175 mm stroke. It features a high-temperature Viton H seal (rated 0 to 150 C) and delivers 6136 N push force at 0.5 MPa through its G1/2 port. Because this SKU lacks a magnet (-S), it cannot accept position sensors.
The direct replacement is the SAI125X175H, matching the bore, stroke, M27x2 rod thread, and ISO 15552 mounting interface. The SAI upgrades the piston seal to two Y-shaped one-way elements for low start-up pressure.
Airtac SI125 Standard Cylinder SI125X175H Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X175H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X175H |
| Bore size | Ø125 mm |
| Stroke | 175 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 SAI125X175H 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 SAI125X175H 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 SI125X175H
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×175 | 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 SI125X175H Is Used
Heavy Stamping Press
Drives large platens and tooling in automated metal stamping lines where the 6136 N push force at 0.5 MPa easily overcomes die resistance.
High-Tact Forming Jig
Operates structural forming fixtures in hot environments up to 150 C, leveraging the Viton H seal to maintain integrity without degrading.
Replacing the Airtac SI125 Standard Cylinder SI125X175H with the SAI125X175H
To replace the SI125X175H, order the SAI125X175H. Verify your ISO 15552 mounting fixtures (LB, FA, CA, TC), the G1/2 port, and the M27x2 rod thread. Since this is a no-S SKU, it cannot support legacy CS1-B/DS1-B sensors; if sensing is needed, switch to an SAI125X175HS. The 175 mm stroke is under the 1500 mm standard max, so no side-load guide is strictly required, but always verify alignment. Operating speed is 30-500 mm/s. For sizing down, a 100 mm bore gives 3927 N push at 0.5 MPa; sizing up to 160 mm provides 10053 N. Note that a plain cylinder drifts without air; for load-holding, use the SAIL or BSAI lock variants, or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X175H
- ✓ 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 SI125X175H FAQ
Yes, the AirTAC SI125X175H is discontinued. The direct replacement is the SAI125X175H. It shares the exact same ISO 15552 mounting interface, 125 mm bore, 175 mm stroke, G1/2 port, and output force, fitting existing fixtures perfectly while upgrading the piston seal.
The bore is 125 mm with a G1/2 air port. The thrust is 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 max of 1251 kgf at 1.0 MPa. It operates at 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X175H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X175H replacement — usually within 7-8 hours.