This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X150SCA, 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 SI125X150SCA
The AirTAC SI125 Standard Cylinder SI125X150SCA is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 150mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X150SCA, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke150 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X150SCA
- 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 SI125X150SCA
The AirTAC SI125X150SCA is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 150 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. The direct replacement is the SAI125X150SCA, matching the bore, stroke, force, port and CA clevis 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, SAIF and BSAI variants the SI lacked. The S magnet works with CS1-B/DS1-B switches, and Viton H seals raise the temperature limit to 150 C.
Airtac SI125 Standard Cylinder SI125X150SCA Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X150SCA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X150SCA |
| Bore size | Ø125 mm |
| Stroke | 150 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 SAI125X150SCA 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 SAI125X150SCA 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 SI125X150SCA
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×150 | 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 SI125X150SCA Is Used
Heavy Press Clamping
Generates 8590 N of thrust at 0.7 MPa to secure large metal castings or heavy plates during machining and pressing operations.
Pallet Lift Gates
Provides a safe 3682 N working load to raise and lower loaded pallet gates, utilizing the CA clevis for pivoting leverage.
Automated Indexing
Drives robust 150 mm stroke indexing arms to move heavy workpieces between manufacturing stations at 30-500 mm/s.
Replacing the Airtac SI125 Standard Cylinder SI125X150SCA with the SAI125X150SCA
To replace the SI125X150SCA, order the SAI125X150SCA. Confirm the ISO 15552 CA clevis mounting, 150 mm stroke, G1/2 port and the S magnet for CS1-B/DS1-B sensors. If sizing up or down, neighbouring bores offer different force classes; this 125 mm bore gives 6136 N push at 0.5 MPa. A plain cylinder drifts on air loss because the cushion only decelerates. For load holding, use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variant. The 32 mm rod and M27x2 thread handle high thrust.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X150SCA
- ✓ 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 SI125X150SCA FAQ
Yes, the SI125X150SCA is discontinued. The direct replacement is the SAI125X150SCA. It shares the same ISO 15552 mounting interface, 125 mm bore, 150 mm stroke, output force, G1/2 port and CA clevis, fitting existing fixtures perfectly.
This double-acting cylinder has a 32 mm rod, M27x2 thread and a 40 mm cushion. It 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. Operating speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X150SCA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X150SCA replacement — usually within 7-8 hours.