This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X630, 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 SI125X630
The AirTAC SI125 Standard Cylinder SI125X630 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 630mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X630, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke630 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X630
- 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 SI125X630
The AirTAC SI125X630 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 630 mm stroke. It delivers 6136 N push force at 0.5 MPa through a G1/2 port. The direct replacement is the SAI125X630, retaining the same interface, output, and mounting.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. Note this SKU lacks a magnet, so it cannot take a sensor.
Airtac SI125 Standard Cylinder SI125X630 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X630 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X630 |
| Bore size | Ø125 mm |
| Stroke | 630 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 SAI125X630 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 SAI125X630 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 SI125X630
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×630 | 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 SI125X630 Is Used
Heavy Stamp Press Feed
Pushes thick metal blanks into a hydraulic press using 6136 N force at 0.5 MPa, relying on the 40 mm adjustable cushions to absorb end-of-stroke impact.
Pallet Dispenser Pusher
Moves loaded pallets along a chain conveyor over 630 mm, requiring external guide rails to support the long rod and prevent side-load binding.
Large Mold Actuation
Opens and closes heavy resin molds on an injection machine, taking advantage of the 125 mm bore's 1251 kgf maximum theoretical force at 1.0 MPa.
Replacing the Airtac SI125 Standard Cylinder SI125X630 with the SAI125X630
To replace the SI125X630, order the SAI125X630 direct. Confirm the ISO 15552 mounting interface, 630 mm stroke, G1/2 port, and M27x2 rod thread. This non-magnet SKU cannot accept CS1-B/DS1-B sensors. At 630 mm stroke, use external guides to prevent rod bending and side loads. Sizing options: step down to an 80 mm bore (2513 N push @0.5 MPa) or up to a 160 mm bore (10053 N). For load holding on air loss, use an external pilot check valve or the SAIL/BSAI lock variant, as cushions only decelerate.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X630
- ✓ 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 SI125X630 FAQ
Yes, the SI125X630 is discontinued. The direct replacement is the SAI125X630. It is dimensionally interchangeable per the ISO 15552 mounting interface, retaining the same 125 mm bore, 630 mm stroke, G1/2 port, and output force.
The G1/2 port feeds a 32 mm rod. Force ratings are: push 6136 N and pull 5734 N at 0.5 MPa; push 8590 N at 0.7 MPa; push 11045 N at 0.9 MPa; with a theoretical max of 1251 kgf at 1.0 MPa. Operating speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X630
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X630 replacement — usually within 7-8 hours.