This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X100LB, 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 SI125X100LB
The AirTAC SI125 Standard Cylinder SI125X100LB 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 SAI125X100LB, 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 → SAI125X100LB
- 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 SI125X100LB
The AirTAC SI125X100LB is a discontinued double-acting ISO 15552 profile cylinder. Built with an extruded aluminum barrel, it delivers 6136 N push force at 0.5 MPa through a G1/2 port. AirTAC replaced this legacy unit with the SAI125X100LB. This direct successor maintains the exact ISO 15552 mounting interface, 100 mm stroke, force class, and LB foot mounting for existing fixtures.
The SAI upgrade introduces a refined piston seal featuring two Y-shaped one-way elements for low start-up pressure and extended life. For load-holding, note that a standard cylinder drifts on air loss; the cushion only decelerates. Use the SAIL or BSAI lock variants, or an external pilot check valve. This non-magnet SKU cannot take a sensor.
Airtac SI125 Standard Cylinder SI125X100LB Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X100LB |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X100LB |
| 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 SAI125X100LB 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 SAI125X100LB 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 SI125X100LB
| 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 SI125X100LB Is Used
Heavy Press Clamping
Secures large metal castings during CNC machining, utilizing the 6136 N push force at 0.5 MPa to prevent workpiece shifting under high cutting loads.
Injection Mold Ejection
Drives robust ejection plates out of heavy industrial molds, benefiting from the 32 mm piston rod and 40 mm adjustable air cushions to absorb end-of-stroke impact.
Pallet Stopper Gate
Acts as a high-capacity stopper arm on heavy-duty pallet conveyor lines, where the LB foot mounting handles substantial lateral blocking forces safely.
Replacing the Airtac SI125 Standard Cylinder SI125X100LB with the SAI125X100LB
To replace the discontinued SI125X100LB, order the SAI125X100LB. Verify the ISO 15552 LB foot mounting, 125 mm bore, 100 mm stroke, and G1/2 port (PT/G/NPT thread options). Because this SKU lacks the -S magnet, it cannot support CS1-B/DS1-B sensors; select a magnet-equipped SAI if position detection is needed. Sizing both ways: this bore yields 6136 N push at 0.5 MPa (11045 N at 0.9 MPa). If lower force is acceptable, an 80 mm bore provides 2513 N; for heavier cycles, a 160 mm bore offers 10053 N. For any load holding on air loss, specify the SAIL or BSAI lock variant, as standard cushions only decelerate. The 32 mm rod uses an M27x2 thread.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X100LB
- ✓ 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 SI125X100LB FAQ
Yes, the SI125X100LB is discontinued. The direct replacement is the SAI125X100LB. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 100 mm stroke, G1/2 port, and LB foot mounting interface.
This double-acting cylinder features a G1/2 air port and an 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 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 SAI125X100LB
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X100LB replacement — usually within 7-8 hours.