The main types of EMT fittings are connectors, couplings, straps, bushings, locknuts, and specialty fittings such as expansion connectors. Connectors join EMT conduit to an electrical box or enclosure, while couplings connect two conduit lengths. Straps secure conduit to a supporting surface, and bushings or locknuts help finish and secure connections. The right choice depends on the connection, installation environment, conduit size, and required material or finish.
EMT, or electrical metallic tubing, is commonly installed with fittings sized to match its trade size. Common sizes include 1/2 in, 3/4 in, and 1 in, although availability depends on the product range and market. Below, we explain what each fitting does, how set-screw and compression styles differ, and what to check when sourcing fittings for a project.
EMT fittings are components used to connect, support, or finish an EMT conduit installation. They help create a continuous route for conductors while securing the tubing at junction boxes, enclosures, and supporting structures. The fitting must match the conduit’s trade size and connection requirements. For electrical installations, buyers and installers should also verify that the selected product is suitable for the intended location and complies with applicable local codes and project specifications.
An EMT connector attaches the end of a conduit section to an electrical box, cabinet, or enclosure. One side receives the EMT, and the other side is secured at the enclosure opening, commonly using a locknut where the connector design requires it. Connectors are available in different configurations and materials, so the connection method and installation environment should guide selection. Confirm the required trade size and whether the project specifies a particular connector style.
A coupling joins two EMT sections end to end to extend a conduit run. It is useful when a single conduit length does not cover the route or when a layout calls for multiple sections. Couplings may use set-screw or compression connections. Check that both conduit ends are fully inserted and secured according to the fitting manufacturer’s instructions.
Set-screw connectors and couplings secure EMT using one or more screws tightened against the tubing. They are often selected for straightforward installations where the specified fitting type is appropriate for the location. Installation quality matters: screws need to be tightened as directed, and the conduit must be seated correctly. Do not assume that a set-screw fitting is suitable for every wet, outdoor, or other demanding environment; verify its rating and project requirements.
Compression connectors and couplings use a compression mechanism to hold EMT in place. They are selected when the application or project specification calls for this connection style. As with set-screw products, the fitting’s construction, material, and stated suitability should be checked for the installation conditions. Buyers should compare the required connection method rather than treating compression as a universal upgrade.
Straps and clamps secure conduit to a wall, ceiling, or other supporting surface. Common forms include one-hole and two-hole straps, with the choice depending on the installation design and the support method. Correct spacing and fastening are determined by applicable codes, project specifications, and the fitting or conduit manufacturer’s guidance. Select a strap that fits the conduit trade size and is compatible with the mounting surface and environment.
A bushing can provide a finished edge at a conduit termination and may help protect conductors from contact with sharp edges, depending on its design and application. A locknut is used to secure compatible fittings at an enclosure wall. These parts are small, but incorrect size or thread compatibility can prevent a secure fit. Check enclosure opening, connector design, and installation requirements before ordering.
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Specialty options may include expansion fittings for installations where movement between sections needs to be accommodated, as well as fittings designed for particular transitions or layout conditions. Their suitability depends on the movement expected, installation geometry, and product design. These fittings should not be substituted for standard connectors or couplings without confirming the application. Provide the supplier with the installation details so the proposed product can be checked against the requirement.
EMT fittings may be offered in materials such as steel, zinc die-cast metal, or aluminum, depending on product type and supplier range. Material choice can affect weight, corrosion considerations, mechanical characteristics, and compatibility with the rest of the installation. A fitting’s finish is also relevant, particularly where the product will be exposed to moisture or other environmental factors. Verify product documentation rather than relying on appearance alone.
| Fitting type | Primary function | Buyer check |
|---|---|---|
| Connector | Connects EMT to a box or enclosure | Trade size, connection style, enclosure compatibility |
| Coupling | Joins two EMT sections | Trade size, fitting style, installation conditions |
| Strap or clamp | Supports conduit along a route | Conduit fit, mounting method, required spacing |
| Bushing or locknut | Finishes or secures a connection | Thread, opening, and connector compatibility |
List every connection needed: conduit to enclosure, conduit to conduit, or conduit to a supporting surface. Then confirm the EMT trade size for each run. For example, a 3/4 in conduit run needs fittings specified for the corresponding trade size, not a measurement chosen by visual comparison. If the project uses more than one size, separate the quantities to reduce ordering errors.
Identify whether the installation is indoors, outdoors, or in another condition that affects fitting selection. Review the product’s stated suitability and any project requirements for moisture exposure, corrosion resistance, or mechanical protection. Avoid assuming that all fittings made from the same material share the same rating. When the installation is subject to electrical codes, ask the responsible professional to confirm the required product type.
Confirm that fittings are intended for EMT and that their connection dimensions match the conduit and enclosure. For larger orders, request product specifications, material and finish details, packaging information, and any available compliance documentation relevant to the destination market. The details required can vary by project and jurisdiction. A clear specification before purchase helps suppliers quote the correct item and helps buyers compare like for like.
For B2B purchasing, a supplier conversation is most productive when the requirements are specific. SIOSAN can support discussions about EMT fitting types and sourcing requirements alongside aluminum pipe needs. Share the application, conduit trade sizes, preferred fitting style, material or finish requirements, destination market, and estimated order quantity. If you have a drawing, bill of materials, or reference specification, include it so the requested products can be reviewed more accurately.
Before placing a bulk order, ask about the available product range, minimum order quantity, production or supply lead time, packaging, and documents that can be provided for the items being quoted. Availability and lead times can vary by specification and order size, so confirm them for the actual request. This step also gives your procurement team a basis for comparing suppliers without relying on assumptions about fit or delivery.
The main EMT fitting types serve distinct purposes: connectors terminate conduit at enclosures, couplings join conduit sections, straps support the route, and bushings or locknuts complete compatible connections. Set-screw and compression designs are common connection options, while specialty fittings address particular installation conditions. To choose correctly, begin with the application and conduit trade size, then verify material, environment suitability, and project requirements.
Your next step is to prepare a fitting list with sizes, styles, quantities, and any documentation or packaging needs. Send those details to SIOSAN for a product and sourcing discussion, and confirm compatibility and applicable requirements with the project’s responsible electrical professional before installation.
Contact us to discuss your requirements of Main Types of EMT Fittings. Our experienced sales team can help you identify the options that best suit your needs.