This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X1530STC, 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 SI125X1530STC
The AirTAC SI125 Standard Cylinder SI125X1530STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 1530mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X1530STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke1530 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X1530STC
- 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 SI125X1530STC
The AirTAC SI125X1530STC is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 1530 mm stroke. Because 1530 mm exceeds the 1500 mm standard maximum for this bore, this is a non-standard, made-to-order length. It delivers 6136 N push and 5734 pull at 0.5 MPa, utilizing a G1/2 port and M27x2 rod thread. The direct replacement is the SAI125X1530STC, matching the ISO 15552 mounting interface, force, and TC trunnion setup.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. Note that a plain cylinder drifts without live air; use an external rod lock or pilot check valve for load holding, or explore the SAIL or BSAI lock variants the SI lacked.
Airtac SI125 Standard Cylinder SI125X1530STC Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X1530STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X1530STC |
| Bore size | Ø125 mm |
| Stroke | 1530 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 SAI125X1530STC 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 SAI125X1530STC 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 SI125X1530STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×1530 | 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 SI125X1530STC Is Used
Large Material Pushing
Drives heavy structural beams or large pallets along transfer lines using its 6136 N push force at 0.5 MPa over a 1530 mm reach.
Extended Press Lowering
Lowers heavy platens or press tools in deep-draw operations, requiring external guide rails to manage side loads on the long 1530 mm rod.
Replacing the Airtac SI125 Standard Cylinder SI125X1530STC with the SAI125X1530STC
To replace the SI125X1530STC, order the SAI125X1530STC. Confirm the ISO 15552 TC trunnion mounting interface, G1/2 port, M27x2 thread, and the -S magnet for CS1-B/DS1-B sensors (the SAI uses current AirTAC switches). This 1530 mm length is non-standard (exceeding the 1500 mm max); at this extended stroke, you must use external guides to prevent rod bending and side-load damage. For sizing both ways: a 100 mm bore gives 3927 N push at 0.5 MPa, while a 160 mm bore yields 10053 N. If you need built-in load holding on air loss, step up to the SAIL or BSAI variants, as standard cushions only decelerate.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X1530STC
- ✓ 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 SI125X1530STC FAQ
Yes, the SI125X1530STC is discontinued. The direct replacement is the SAI125X1530STC. It is dimensionally interchangeable per ISO 15552, matching the bore, stroke, G1/2 port, TC trunnion mount, and force.
It features a G1/2 port and 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 theoretical max of 1251 kgf at 1.0 MPa. Speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X1530STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X1530STC replacement — usually within 7-8 hours.