This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X125SCA, 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 SI50 Standard Cylinder SI50X125SCA
The AirTAC Airtac SI50 Standard Cylinder SI50X125SCA is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 125mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X125SCA, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke125 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X125SCA
- 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 SI50 Standard Cylinder SI50X125SCA
The AirTAC SI50X125SCA is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 125 mm stroke. It delivers 982 N push force at 0.5 MPa via a G1/4 port. AirTAC replaced this legacy unit with the SAI50X125SCA, a direct replacement retaining the exact ISO 15552 mounting interface, CA clevis, M16x1.5 rod thread, output force, and stroke.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. For position sensing, your SI's -S magnet works with legacy CS1-B/DS1-B switches, while the SAI uses current AirTAC sensors.
Airtac SI50 Standard Cylinder SI50X125SCA Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X125SCA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X125SCA |
| Bore size | Ø50 mm |
| Stroke | 125 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M16×1.5 |
| 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 – 800 mm/s |
| Cushion | Adjustable, 30 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI50X125SCA carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
The SAI50X125SCA produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI50 Standard Cylinder SI50X125SCA
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×125 | 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 SI50 Standard Cylinder SI50X125SCA Is Used
Material Diversion
Actuates a sorting arm on a packaging line to push 40 kg cartons onto secondary routing tracks with reliable 982 N thrust.
Pallet Lift Gate
Raises and lowers a 50 kg access hatch on an automated warehouse conveyor, utilizing the CA clevis for smooth pivoting motion.
Clamp Actuation
Drives a mid-force clamping fixture to secure aluminium housings during CNC machining, using the 125 mm stroke to clear the work area.
Replacing the Airtac SI50 Standard Cylinder SI50X125SCA with the SAI50X125SCA
To replace the SI50X125SCA, order the SAI50X125SCA. Confirm the ISO 15552 CA clevis mounting, 125 mm stroke, G1/4 port, and the -S magnet. If you need more force, the neighbouring 63 mm bore yields 1559 N push at 0.5 MPa; if less is required, the 40 mm bore provides 628 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates near stroke end. For load holding, use an external pilot check valve or explore the SAIL or BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X125SCA
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI50 Standard Cylinder SI50X125SCA FAQ
Yes, the SI50X125SCA is discontinued. The direct replacement is the SAI50X125SCA. It shares the identical ISO 15552 mounting interface, 50 mm bore, 125 mm stroke, G1/4 port, and CA clevis, fitting directly into existing fixtures.
This double-acting cylinder uses a G1/4 air port. It generates 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, 1767 N push at 0.9 MPa, and a theoretical maximum of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X125SCA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X125SCA replacement — usually within 7-8 hours.