EMT Set Screw MA 1/2" to 3"
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EMT Set Screw MA 1/2" to 3"
EMT Set Screw Connector (MA) typically refers to Set Screw Connectors for EMT (Electrical Metallic Tubing), where "MA" stands for a specific type or model of connector (possibly referring to a manufacturer or a specific standard, but usually "MA" could also stand for "Metallic" or a designation for a particular fitting series).
These connectors are used in electrical installations to secure EMT conduit (a type of thin-walled, rigid metal conduit) to other equipment, junction boxes, or panels. The set screw holds the EMT tubing in place by tightening into the metal tubing to ensure a secure connection.
Here’s a breakdown of EMT set screw connectors (MA) and a size chart for common configurations:
Common Sizes for EMT Set Screw Connectors (MA)
| Connector Size | Trade Size (EMT) | Connector Thread (NPT) | Conduit Outer Diameter (OD) | Set Screw Size | Length of Connector |
|---|---|---|---|---|---|
| 1/2" | 1/2" | 1/2" NPT | 0.706" (17.9 mm) | 1/4" x 1/2" | 1-1/2" (38 mm) |
| 3/4" | 3/4" | 3/4" NPT | 0.922" (23.4 mm) | 1/4" x 1/2" | 1-1/2" (38 mm) |
| 1" | 1" | 1" NPT | 1.163" (29.6 mm) | 1/4" x 1/2" | 1-1/2" (38 mm) |
| 1-1/4" | 1-1/4" | 1-1/4" NPT | 1.380" (35.1 mm) | 1/4" x 1/2" | 1-5/8" (41.3 mm) |
| 1-1/2" | 1-1/2" | 1-1/2" NPT | 1.510" (38.4 mm) | 1/4" x 1/2" | 1-5/8" (41.3 mm) |
| 2" | 2" | 2" NPT | 1.810" (46.0 mm) | 1/4" x 1/2" | 2" (50.8 mm) |
| 2-1/2" | 2-1/2" | 2-1/2" NPT | 2.340" (59.4 mm) | 1/4" x 1/2" | 2-1/4" (57.2 mm) |
| 3" | 3" | 3" NPT | 2.900" (73.7 mm) | 5/16" x 5/8" | 2-1/2" (63.5 mm) |
Key Dimensions:
- Connector Size / EMT Trade Size: This refers to the nominal size of the EMT conduit being connected (e.g., 1/2", 3/4", 1", etc.).
- Connector Thread (NPT): These connectors typically have threads on one end that correspond to the National Pipe Thread (NPT) standards to allow them to fit into threaded boxes, hubs, or panels.
- Conduit Outer Diameter (OD): The outer diameter of the EMT conduit that the connector is designed to fit onto.
- Set Screw Size: The size of the set screw used to secure the EMT conduit within the connector.
- Length of Connector: The overall length of the connector, which can vary depending on the size of the conduit and the design of the fitting.
How to Select the Correct Size:
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Determine the EMT Trade Size: The most important factor when selecting an EMT set screw connector is the trade size of the EMT conduit you're working with. Ensure that the connector's trade size matches the conduit size.
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Thread Type and Size: The connector will typically be threaded with NPT (National Pipe Thread) to secure the conduit into an electrical box or other threaded fittings. Match the NPT size to the equipment you're connecting to (e.g., a 1/2" connector will match a 1/2" threaded box).
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Set Screw Size: The set screw helps hold the conduit in place inside the connector. Ensure the set screw is appropriately sized for the conduit diameter.
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Conduit OD: The outer diameter of the EMT conduit is important for ensuring the correct fit within the connector.
Example Use Case:
- If you are installing a 3/4" EMT conduit into an electrical box and you need a connector to attach the conduit to the box, you would select a 3/4" EMT set screw connector, which would be compatible with a conduit that has an outer diameter of around 0.922 inches. The connector would thread into the box and secure the EMT tubing with the set screw.
Notes on Set Screw Functionality:
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Set Screws: These are tightened directly against the EMT conduit to hold it in place within the connector. Tightening the screw ensures a secure connection and prevents the conduit from moving or loosening.
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MA Type Connectors: "MA" may refer to a specific manufacturer's designation or a style of connector. Some manufacturers might label their EMT connectors with additional codes or letters to signify specific features or certifications.
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