This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X650SH, 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 SI125X650SH
The AirTAC SI125 Standard Cylinder SI125X650SH is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 650mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X650SH, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke650 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X650SH
- 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 SI125X650SH
The AirTAC SI125X650SH is a discontinued double-acting ISO 15552 profile cylinder with a 125mm bore and 650mm stroke. It delivers 6136N push force at 0.5MPa via a G1/2 port. The direct replacement is the SAI125X650SH, matching the interface, force, and stroke.
This SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure. The -H option specifies a Viton seal for 0-150C heat. The -S magnet works with CS1-B/DS1-B sensors.
Airtac SI125 Standard Cylinder SI125X650SH Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X650SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X650SH |
| Bore size | Ø125 mm |
| Stroke | 650 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 SAI125X650SH 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 SAI125X650SH 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 SI125X650SH
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×650 | 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 SI125X650SH Is Used
Heavy Press Clamping
Secures large metal castings during machining, using the 6136N push force at 0.5MPa to hold parts rigidly against cutting loads.
Pallet Diversion
Extends 650mm to push heavy pallets off a main conveyor line onto a secondary packaging spur without requiring external boosters.
Replacing the Airtac SI125 Standard Cylinder SI125X650SH with the SAI125X650SH
To replace the SI125X650SH, order the SAI125X650SH direct, confirming the ISO 15552 mounting dimensions, 125mm bore, 650mm stroke, G1/2 port, and M27x2 thread. The -S magnet enables CS1-B/DS1-B sensors, while the SAI uses current AirTAC switches. For load holding, note that a plain cylinder drifts without live air; use an external rod lock or the SAIL/BSAI lock variant. At 650mm stroke, prevent rod bending by using an external guide to absorb side loads. Neighbouring bores: 100mm yields 3927N push at 0.5MPa; 160mm yields 10053N.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X650SH
- ✓ 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 SI125X650SH FAQ
Yes, the SI125X650SH is discontinued. The direct replacement is the SAI125X650SH. It is dimensionally interchangeable per ISO 15552, retaining the exact same 125mm bore, 650mm stroke, G1/2 port, and mounting interface.
It features a G1/2 port and provides 6136N push / 5734N pull at 0.5MPa, 8590N push at 0.7MPa, 11045N push at 0.9MPa, and a theoretical max of 1251 kgf at 1.0MPa. Speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X650SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X650SH replacement — usually within 7-8 hours.