Metal EMT Two Hole Strap: Sizes, Dimensions, and How to Choose the Right Fit

Choose a metal EMT two-hole strap by matching its listed conduit trade size to the EMT, then confirm the strap’s material, width, hole spacing, and fastener requirements against your installation. The strap size refers to the conduit size it is designed to hold; it does not tell you the strap’s overall length or the distance between its mounting holes. For example, 1-inch EMT has an outside diameter of 1.163 inches (29.5 mm), so a strap intended for 1-inch EMT should fit that conduit while allowing for the product’s forming and installation design.

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This guide is for electrical contractors, distributors, project buyers, and OEM teams comparing metal straps for EMT installations. We explain how trade sizes relate to conduit dimensions, which product details to verify, and how to request a fit that suits your project. At SIOSAN, we recommend confirming the exact conduit and mounting requirements before placing a bulk order.

Key takeaways

• Match the strap’s stated trade size to the EMT trade size, not to a rough measurement of the strap’s outside profile.
• Check actual EMT outside diameter when confirming fit, particularly when evaluating drawings or a new supplier sample.
• Strap width, thickness, hole diameter, and hole-center spacing can vary by design; request a drawing or sample if these details are critical.
• Select material and finish for the installation environment, and verify code and project requirements with the responsible designer or authority.

What a metal EMT two-hole strap does

A metal EMT two-hole strap is a formed support used to secure electrical metallic tubing to a mounting surface. Its curved section sits around the conduit, while two holes provide points for screws or other specified fasteners. The strap helps keep a conduit run in position, but it does not replace correct conduit sizing, suitable anchors, or installation practices required for the project.

Two-hole designs are often selected when installers want two fastening points at each support location. The product’s actual holding performance depends on factors such as material, geometry, fastener choice, substrate, and installation conditions. Buyers should therefore treat a product description as a starting point and confirm the relevant specifications rather than assuming every strap with the same trade size is interchangeable.

EMT trade sizes and conduit dimensions

EMT is commonly identified by trade size, which is a nominal designation rather than a direct measurement of its outside diameter. This distinction matters because the strap has to fit around the conduit’s actual outside profile. The following commonly used EMT dimensions provide a reference for checking product fit; confirm the applicable specification and tubing supplied for your project before ordering.

These values describe the conduit, not the strap’s overall dimensions. A strap intended for 3/4-inch EMT is selected for that trade size, even though the conduit’s outside diameter is approximately 0.922 inch (23.4 mm). Do not use the table as a substitute for a product drawing or a dimensional check when a close fit or a defined mounting pattern is required.

Which strap dimensions should buyers check?

Fit around the conduit

Start with the trade size marked on the EMT and match it to the strap’s stated compatible size. If you are checking a sample or reviewing a drawing, compare the intended inside profile with the conduit outside diameter. Also consider whether the design is meant to hold the conduit closely or provide installation clearance, since strap geometry can differ between suppliers.

Width, thickness, and overall profile

Strap width and material thickness influence the product’s profile and may affect how it suits the mounting surface and project specification. These dimensions are not determined by conduit trade size alone. Ask the supplier for a drawing that identifies the measurement points and tolerances, especially when the strap must fit an existing assembly or automated installation process.

Hole size and hole-center spacing

Confirm the diameter and shape of both mounting holes, along with the distance from center to center. These details determine whether the planned fasteners and mounting pattern align with the product. If your project specifies screw type, anchor, or edge clearance, include those requirements in the inquiry rather than relying on a generic product name.

Materials, finishes, and application matching

Metal EMT straps may be offered in different base materials and finishes, depending on the supplier and product range. Options can include steel with a protective finish, stainless steel, or aluminum, but availability and suitability vary. Match the material and finish to the installation environment, contact conditions, project documents, and any applicable electrical or building requirements.

For indoor installations, buyers may prioritize a specified finish, consistent dimensions, and compatibility with the mounting hardware. For outdoor or corrosive environments, ask the project engineer or responsible specifier to identify the required material and corrosion protection. Do not assume that a finish suitable for one location or metal combination will be appropriate for another.

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For installations involving aluminum pipes or other aluminum components, consider material compatibility and the project’s corrosion-control requirements. Confirm the full assembly—including the strap, conduit or pipe, fasteners, and mounting surface—rather than evaluating the strap in isolation. The final selection should follow the project specification and local requirements.

How to choose the right fit

1. Identify the conduit accurately

Record the EMT trade size and verify the supplied conduit standard or specification. If the labeling is unavailable, measure the outside diameter with an appropriate measuring tool and confirm the result with the conduit supplier. Avoid selecting a strap based only on an approximate visual comparison.

2. Define the mounting requirements

Document the substrate, fastener type, hole spacing, and any clearance constraints. If the strap will attach to a channel, enclosure, or pre-drilled panel, provide the relevant interface dimensions. This helps the supplier determine whether a standard design is suitable or whether you need a specific configuration.

3. Specify material and finish

State the installation environment and any project requirements for base material, coating, or corrosion resistance. If dissimilar metals are present, ask the responsible technical contact to review compatibility for the complete assembly. Do not treat a material description alone as proof of performance in a particular environment.

4. Review the drawing or sample

Before bulk purchasing, compare the supplier’s drawing or sample with your conduit and mounting pattern. Check the strap fit, overall width, thickness, hole dimensions, and center-to-center spacing. For repeat orders, retain the approved drawing and identify the revision in purchase documents.

Pricing, MOQ, and lead-time considerations

Pricing can depend on material, finish, dimensions, order quantity, packaging, and whether the request uses a standard product or requires a special configuration. Minimum order quantities and production lead times also vary by supplier and by the availability of materials or tooling. Request a written quotation that states the product size, material, finish, quantity, packaging, and delivery terms so that offers can be compared on the same basis.

For projects with phased delivery, share forecast quantities and required ship dates early in the sourcing process. If samples or pre-production approval are needed, include that step in the schedule. We recommend confirming any MOQ, lead-time estimate, and change-control terms directly with the supplier rather than assuming they apply across product sizes.

Supplier evaluation checklist

• Can the supplier identify the strap’s compatible EMT trade size and provide a dimensioned drawing?
• Are material, finish, hole dimensions, and tolerances clearly stated in the quotation or product documentation?
• Can the supplier provide a sample or first-article review when fit is important?
• Are packaging, order quantity, lead-time estimate, and delivery terms documented?
• Can the supplier explain how revisions and repeat-order specifications will be controlled?

At SIOSAN, we support B2B buyers by reviewing requested product dimensions, material preferences, and order requirements for metal conduit support products. As a supplier associated with aluminum pipes, we understand the value of checking component fit and material details across an assembly. Share your EMT trade size, drawing, application environment, and target quantity so our team can assess the request and confirm the available options.

Conclusion: confirm size, dimensions, and installation needs

The right metal EMT two-hole strap is the one specified for your EMT trade size and verified against the conduit’s outside diameter, mounting pattern, material, and project conditions. Trade size is only the first selection point; hole spacing, strap profile, finish, and fastener compatibility also deserve review. Before ordering, compare a dimensioned drawing or sample with the actual conduit and mounting surface.

For a sourcing inquiry, prepare the EMT size, required material and finish, hole or mounting dimensions, quantity, and delivery schedule. Send those details to SIOSAN to discuss product availability and specification review. This information gives both parties a clearer basis for confirming fit and preparing a suitable quotation.