This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X215S, 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 SI125X215S
The AirTAC SI125 Standard Cylinder SI125X215S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 215mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X215S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke215 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X215S
- 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 SI125X215S
The AirTAC SI125X215S is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 215 mm stroke. It delivers 6136 N push force at 0.5 MPa through a G1/2 port. AirTAC replaced this legacy unit with the SAI125X215S, a direct sharing the exact ISO 15552 mounting interface, bore, stroke, output force, port size and mounting accessories.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The SAI family also introduces SAIL and BSAI lock variants the original SI line lacked. This -S SKU includes a piston magnet for legacy CS1-B/DS1-B sensors.
Airtac SI125 Standard Cylinder SI125X215S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X215S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X215S |
| Bore size | Ø125 mm |
| Stroke | 215 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 SAI125X215S 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 SAI125X215S 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 SI125X215S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×215 | 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 SI125X215S Is Used
Heavy Pressing
Drives robust pressing and forming stations requiring 6136 N thrust at 0.5 MPa.
Pallet Handling
Actuates large diverters and heavy pallet lifts in distribution centers.
Clamp Fixtures
Secures heavy workpieces in machining cells using the 125 mm bore power.
Replacing the Airtac SI125 Standard Cylinder SI125X215S with the SAI125X215S
To replace the SI125X215S, order the SAI125X215S. Confirm the ISO 15552 mounting interface, 215 mm stroke, G1/2 port (PT/G/NPT thread), and your mounting accessory (LB, FA, TC, etc.). The -S suffix means a magnet is present for CS1-B/DS1-B switches; the SAI replacement uses current AirTAC switches. Sizing both ways: the neighboring 100 mm bore yields 3927 N push at 0.5 MPa, while the 160 mm bore yields 10053 N. A plain cylinder drifts without live air, so for load holding use an external rod lock or pilot check valve, or specify an SAIL/BSAI lock variant. Since the 215 mm stroke exceeds 300 mm only marginally, ensure adequate guidance to prevent rod bending under side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X215S
- ✓ 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 SI125X215S FAQ
Yes, the AirTAC SI125X215S is discontinued. The direct replacement is the SAI125X215S. It is dimensionally interchangeable per ISO 15552, matching the 125 mm bore, 215 mm stroke, force, G1/2 port and mounting fixtures.
The G1/2 port bore delivers 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 max force is 1251 kgf at 1.0 MPa. Speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X215S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X215S replacement — usually within 7-8 hours.