This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X100H, 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 SI125X100H
The AirTAC SI125 Standard Cylinder SI125X100H is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 100mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X100H, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke100 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X100H
- 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 SI125X100H
The AirTAC SI125X100H is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 100 mm stroke. Designed for high-force tasks, it delivers 6136 N push and 5734 N pull at 0.5 MPa, operating with a G1/2 port and M27x2 rod thread. As a legacy unit, it must be replaced by the current-production SAI125X100H. This direct successor matches the exact ISO 15552 mounting interface, bore, stroke, force, and port size, dropping directly into existing fixtures.
The SAI125X100H features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. This specific SKU lacks a magnet (-S) and cannot accept a sensor, unlike the CS1-B/DS1-B switches used on magnetized versions. The -H designation indicates a Viton FKM seal, extending the operating temperature from -20...+70 C up to 0...150 C.
Airtac SI125 Standard Cylinder SI125X100H Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X100H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X100H |
| Bore size | Ø125 mm |
| Stroke | 100 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 SAI125X100H 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 SAI125X100H 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 SI125X100H
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×100 | 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 SI125X100H Is Used
Heavy Stamping Press
Drives large press tools requiring 6136 N of push force at 0.5 MPa, utilizing the 100 mm stroke for high-impact metal forming operations.
High-Tamp Molding
Operates plastic or rubber molding clamps near 150 C equipment, leveraging the Viton H high-temperature seals to prevent premature degradation.
Replacing the Airtac SI125 Standard Cylinder SI125X100H with the SAI125X100H
To replace the discontinued SI125X100H, order the SAI125X100H. Verify your existing setup's ISO 15552 mounting interface (LB, FA, TC, etc.), the 125 mm bore, 100 mm stroke, and G1/2 port. Because this SKU has no magnet, it cannot support position sensing; if switches are needed, select an SAI125X100HS. The -H Viton seal is required for high-temperature environments up to 150 C. When sizing, the 125 mm bore yields 6136 N push at 0.5 MPa; if less force is needed, an 80 mm bore provides 2513 N, while a 160 mm bore offers 10053 N. Note that a plain cylinder drifts without live air; the cushion only decelerates. For load holding on air loss, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X100H
- ✓ 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 SI125X100H FAQ
Yes, the AirTAC SI125X100H is discontinued. The direct replacement is the SAI125X100H. It shares the identical ISO 15552 mounting interface, 125 mm bore, 100 mm stroke, force, and G1/2 port, fitting existing fixtures perfectly without modifications.
This 125 mm bore cylinder features a G1/2 air port and M27x2 rod thread. 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 SAI125X100H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X100H replacement — usually within 7-8 hours.