This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125BX200S, 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 SI125BX200S
The AirTAC SI125 Standard Cylinder SI125BX200S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 200mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125BX200S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke200 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125BX200S
- 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 SI125BX200S
The AirTAC SI125BX200S is a discontinued double-acting ISO 15552 profile cylinder featuring a SUS304 stainless steel piston rod and a built-in magnet. Delivering 6136 N push force at 0.5 MPa through a 125 mm bore, it is replaced by the SAI125BX200S. This direct successor shares the exact ISO 15552 mounting interface, 200 mm stroke, G1/2 port, and M27x2 rod thread.
The SAI upgrade introduces a two-piece Y-shaped piston seal for low start-up pressure and extended life. Note that standard cylinders drift without live air; use an external rod lock or the SAIL lock variant for secure holding.
Airtac SI125 Standard Cylinder SI125BX200S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125BX200S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125BX200S |
| Bore size | Ø125 mm |
| Stroke | 200 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 SAI125BX200S 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 SAI125BX200S 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 SI125BX200S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×200 | 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 SI125BX200S Is Used
Heavy Press Clamping
Secures large steel plates in machining centers using the 6136 N push force, with the SUS304 rod resisting coolant corrosion.
Pallet Lift Gates
Raises and lowers heavy loading dock gates, safely moving loads up to the 313 kg vertical lift threshold calculated at 0.5 MPa.
Stamping Ejectors
Ejects dense metal stampings from hydraulic presses, relying on the 40 mm adjustable air cushions to decelerate the 32 mm rod.
Replacing the Airtac SI125 Standard Cylinder SI125BX200S with the SAI125BX200S
To replace the discontinued SI125BX200S, order the SAI125BX200S, confirming the ISO 15552 mounting interface, 125 mm bore, 200 mm stroke, G1/2 port, and the -S magnet for legacy CS1-B/DS1-B sensors. The -B rod specifies SUS304 stainless steel for corrosion resistance. If sizing down, a 100 mm bore yields 3927 N push at 0.5 MPa; if sizing up, a 160 mm bore provides 10053 N. For load holding, remember the air cushion only decelerates; it does not lock. Use a pilot-operated check valve, an external rod lock, or the SAIL/BSAI variants to prevent drift. The SAIF self-valve option is unavailable for this 125 mm bore.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125BX200S
- ✓ 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 SI125BX200S FAQ
Yes, the SI125BX200S is discontinued. The direct replacement is the SAI125BX200S. It matches the ISO 15552 mounting interface, 125 mm bore, 200 mm stroke, output force, and G1/2 port, fitting existing fixtures perfectly.
The G1/2 port feeds a 32 mm rod yielding 6136 N push and 5734 N pull at 0.5 MPa. At 0.7 MPa push is 8590 N, and 11045 N at 0.9 MPa. The theoretical maximum is 1251 kgf at 1.0 MPa, operating at 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125BX200S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125BX200S replacement — usually within 7-8 hours.