This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X1500STC, 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 SI125X1500STC
The AirTAC SI125 Standard Cylinder SI125X1500STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 1500mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X1500STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke1500 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X1500STC
- 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 SI125X1500STC
The AirTAC SI125X1500STC is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 1500 mm stroke. It delivers 6136 N push force at 0.5 MPa, featuring a G1/2 port and TC trunnion mount. The direct replacement is the SAI125X1500STC, matching the exact interface, force, and stroke.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. For load holding, note the cushion only decelerates; use SAIL or BSAI lock variants.
Airtac SI125 Standard Cylinder SI125X1500STC Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X1500STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X1500STC |
| Bore size | Ø125 mm |
| Stroke | 1500 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 SAI125X1500STC 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 SAI125X1500STC 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 SI125X1500STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×1500 | 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 SI125X1500STC Is Used
Automated Press Lines
Drives heavy-duty press operations where the 6136 N push force at 0.5 MPa is required to form or stamp components reliably over long distances.
Pallet Transfer
Moves large loaded pallets along extended material handling lines, utilizing the 1500 mm stroke to span wide conveyor gaps efficiently.
Heavy Goods Diverting
Actuates large diverter arms for heavy freight sorting, depending on the robust 125 mm bore and TC trunnion mount to handle high side loads.
Replacing the Airtac SI125 Standard Cylinder SI125X1500STC with the SAI125X1500STC
To replace the SI125X1500STC, order the SAI125X1500STC. Confirm the ISO 15552 TC trunnion mount, 1500 mm stroke, G1/2 port, and -S magnet for CS1-B/DS1-B sensors (SAI uses current AirTAC switches). At 1500 mm, external guides are critical to prevent rod bending. If 6136 N push @0.5 MPa is insufficient, step up to bore 160 (10053 N). For load holding on air loss, select the SAIL or BSAI lock variant, as standard cushions only decelerate.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X1500STC
- ✓ 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 SI125X1500STC FAQ
Yes, the SI125X1500STC is discontinued. The direct replacement is the SAI125X1500STC. It matches the ISO 15552 mounting interface, 125 mm bore, 1500 mm stroke, force, G1/2 port, and TC trunnion mount.
The G1/2 port bore 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, and a max force of 1251 kgf at 1.0 MPa. Speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X1500STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X1500STC replacement — usually within 7-8 hours.