This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X350SLB, 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 SI125X350SLB
The AirTAC SI125 Standard Cylinder SI125X350SLB is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 350mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X350SLB, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke350 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X350SLB
- 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 SI125X350SLB
The AirTAC SI125X350SLB is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 350 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. The direct replacement is the SAI125X350SLB, matching the interface, force, and LB foot mounting.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. It also adds SAIL and BSAI lock variants the SI lacked. The -S magnet supports CS1-B/DS1-B sensors, while Viton H seals raise temps to 150 C.
Airtac SI125 Standard Cylinder SI125X350SLB Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X350SLB |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X350SLB |
| Bore size | Ø125 mm |
| Stroke | 350 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 SAI125X350SLB 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 SAI125X350SLB 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 SI125X350SLB
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×350 | 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 SI125X350SLB Is Used
Heavy Press Clamping
Secures large metal workpieces in machining centers, utilizing the 6136 N push force to hold parts firmly against cutting vibrations.
Pallet Load Shifting
Indexes heavy loaded pallets along conveyor lines, where the 350 mm stroke provides the reach needed to push bulky assemblies into staging zones.
Industrial Door Actuation
Drives large automated factory access doors, taking advantage of the LB foot mount and ISO 15552 profile to handle substantial door mass safely.
Replacing the Airtac SI125 Standard Cylinder SI125X350SLB with the SAI125X350SLB
To replace the SI125X350SLB, order the SAI125X350SLB. Verify the ISO 15552 LB foot mounting, 350 mm stroke, G1/2 port, M27x2 rod thread, and the -S magnet for CS1-B/DS1-B switches (the SAI uses current AirTAC switches). Sizing both ways: a 100 mm bore gives 3927 N [email protected], while a 160 mm bore gives 10053 N. Note that a plain cylinder drifts without live air; use an external rod lock or pilot check valve for load holding, or specify an SAIL/BSAI lock variant. At 350 mm stroke, use external guides to prevent rod bending and side loads. Speed is 30-500 mm/s.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X350SLB
- ✓ 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 SI125X350SLB FAQ
Yes, the SI125X350SLB is discontinued. The direct replacement is the SAI125X350SLB. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 350 mm stroke, LB foot mount, G1/2 port, and output force.
This double-acting cylinder uses a G1/2 air port. The thrust figures are: 6136 N push and 5734 N pull at 0.5 MPa, 8590 N push at 0.7 MPa, 11045 N push at 0.9 MPa, and a theoretical maximum of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X350SLB
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X350SLB replacement — usually within 7-8 hours.