This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X382SN, 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 SI125X382SN
The AirTAC SI125 Standard Cylinder SI125X382SN is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 382mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X382SN, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke382 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X382SN
- 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 SI125X382SN
The AirTAC SI125X382SN is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 382 mm stroke. Delivering 6136 N push force at 0.5 MPa, it features a G1/2 port, M27x2 rod thread, and an NBR (-N) seal rated for -20 to +70 C. The direct replacement is the SAI125X382SN, matching the interface, force, and mounting exactly.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. It also adds SAIL, SAIF, and BSAI lock variants the SI lacked. With the -S magnet, this legacy model uses CS1-B/DS1-B switches.
Airtac SI125 Standard Cylinder SI125X382SN Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X382SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X382SN |
| Bore size | Ø125 mm |
| Stroke | 382 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 SAI125X382SN 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 SAI125X382SN 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 SI125X382SN
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×382 | 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 SI125X382SN Is Used
Heavy Stamping Press
Drives heavy tooling in automated stamping lines, utilizing the 6136 N push force at 0.5 MPa to form thick metal components reliably.
Pallet Lift Station
Actuates large load platforms in packaging facilities, where the 382 mm stroke provides the extended travel needed for pallet handling.
Material Extrusion
Applies steady clamping pressure on large extrusion dies, benefiting from the robust 125 mm bore and adjustable 40 mm air cushions.
Replacing the Airtac SI125 Standard Cylinder SI125X382SN with the SAI125X382SN
To replace the SI125X382SN, order the SAI125X382SN. Verify the ISO 15552 mounting interface, 125 mm bore, 382 mm stroke, G1/2 port, and your specific mounting accessory. The -S magnet enables position sensing, while the -N denotes the NBR seal. Neighbouring bores are 100 mm (3927 N [email protected]) and 160 mm (10053 N [email protected]). Note that 382 mm exceeds standard increments, so confirm availability. Because this is a 382 mm stroke, use external guides to prevent rod bending and side-load wear. A plain cylinder drifts on air loss; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X382SN
- ✓ 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 SI125X382SN FAQ
Yes, the AirTAC SI125X382SN is discontinued. The direct replacement is the SAI125X382SN. It is dimensionally interchangeable per ISO 15552, matching the 125 mm bore, 382 mm stroke, G1/2 port, and mounting interface, so it fits existing fixtures perfectly.
The 125 mm bore features a G1/2 port and M27x2 rod thread. 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, and 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 SAI125X382SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X382SN replacement — usually within 7-8 hours.