This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X220STC, 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 SI125X220STC
The AirTAC SI125 Standard Cylinder SI125X220STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 220mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X220STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke220 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X220STC
- 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 SI125X220STC
The AirTAC SI125X220STC is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 220 mm stroke. It delivers 6136 N push force at 0.5 MPa through a G1/2 port. The direct replacement is the SAI125X220STC, sharing the exact ISO 15552 mounting interface, TC trunnion, and M27x2 rod thread.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family also adds SAIL and BSAI lock variants absent in the SI line.
Airtac SI125 Standard Cylinder SI125X220STC Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X220STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X220STC |
| Bore size | Ø125 mm |
| Stroke | 220 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 SAI125X220STC 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 SAI125X220STC 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 SI125X220STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×220 | 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 SI125X220STC Is Used
Heavy Stamping Press
Drives large heavy-duty stamping dies requiring 6136 N push force at 0.5 MPa with robust TC trunnion mounting.
Automated Assembly Fixture
Actuates large industrial clamps on an assembly line, utilizing the 220 mm stroke and adjustable 40 mm cushions.
Replacing the Airtac SI125 Standard Cylinder SI125X220STC with the SAI125X220STC
To replace the SI125X220STC, order the SAI125X220STC. Confirm the ISO 15552 TC trunnion mounting, 220 mm stroke, G1/2 port, and the -S magnet for CS1-B/DS1-B sensors (the SAI uses current AirTAC switches). If you need more force than the 6136 N at 0.5 MPa, step up to a 160 mm bore; if less is required, a 100 mm bore provides 3927 N. Because this is a 220 mm stroke, ensure adequate guide support to prevent rod bending under side loads. A plain cylinder drifts on air loss; for load holding, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X220STC
- ✓ 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 SI125X220STC FAQ
Yes, the SI125X220STC is discontinued. The direct replacement is the SAI125X220STC. It shares the same ISO 15552 mounting interface, 125 mm bore, 220 mm stroke, G1/2 port, and output force, fitting directly into existing TC trunnion fixtures.
This double-acting cylinder has a G1/2 port and an M27x2 rod thread. It delivers 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 max of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X220STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X220STC replacement — usually within 7-8 hours.