This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X125SH, 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 SI125X125SH
The AirTAC SI125 Standard Cylinder SI125X125SH is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 125mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X125SH, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke125 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X125SH
- 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 SI125X125SH
The AirTAC SI125X125SH is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 125 mm stroke. It delivers 6136 N push force at 0.5 MPa through a G1/2 port. The direct replacement is the SAI125X125SH, matching the interface, bore, stroke, force, port, and mounting. The SAI upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life. The -H suffix indicates a Viton FKM seal, extending operating temperature to 0-150 C. The -S magnet works with legacy CS1-B/DS1-B switches.
The SAI family adds variants the SI lacked, including SAIL air-released lock, SAIF integrated valve, and BSAI clamp-lock options.
Airtac SI125 Standard Cylinder SI125X125SH Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X125SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X125SH |
| Bore size | Ø125 mm |
| Stroke | 125 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 SAI125X125SH 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 SAI125X125SH 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 SI125X125SH
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×125 | 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 SI125X125SH Is Used
Heavy Stamping
Drives large press dies and heavy stamping fixtures requiring 6136 N push force at 0.5 MPa.
High-Tact Clamping
Secures workpieces in automated machining cells, benefiting from the Viton H seal for high-thermal environments.
Replacing the Airtac SI125 Standard Cylinder SI125X125SH with the SAI125X125SH
To replace the discontinued SI125X125SH, order the SAI125X125SH. Verify the ISO 15552 mounting interface, 125 mm stroke, G1/2 port, and your mounting accessory. The -S magnet enables current AirTAC switches, replacing the legacy CS1-B/DS1-B sensors. The -H Viton seal supports 0-150 C. If sizing up or down, compare neighboring bores and the 0.5 MPa force ratings. A plain cylinder does not hold load without live air; the cushion only decelerates. For load holding on air loss, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X125SH
- ✓ 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 SI125X125SH FAQ
Yes, the SI125X125SH is discontinued. The direct replacement is the SAI125X125SH. It is dimensionally interchangeable per ISO 15552 mounting-interface dimensions, offering the same 125 mm bore, 125 mm stroke, force, G1/2 port, and mounting fixtures.
This double-acting cylinder features 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 max of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X125SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X125SH replacement — usually within 7-8 hours.