I use an Electrical EMT two hole strap to secure electrical metallic tubing (EMT) against a wall, ceiling, frame, or other supporting surface. The correct strap must match the conduit’s nominal trade size, suit the installation environment, and provide two suitable mounting points without deforming the tubing. In practice, buyers should confirm the strap’s inner profile, hole layout, material, coating, and installation spacing against the applicable electrical code and the supplier’s product drawing.
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This guide explains how I evaluate EMT two hole strap sizes, dimensions, materials, and installation requirements. It also shows which details should be specified when purchasing from a manufacturer or exporter such as SIOSAN, a supplier focused on aluminum pipes and related conduit components.
This guide is intended for electrical contractors, panel builders, cable management distributors, OEM purchasing teams, and project engineers. It is useful when selecting replacement straps, preparing a bill of materials, or comparing products from different suppliers. It can also help buyers avoid a common error: treating the nominal EMT size as if it were the strap’s exact internal dimension.
An EMT two hole strap is a metal support fitting with a shaped body and two mounting holes. The shaped section holds the conduit, while the two holes distribute the fastening load and help keep the conduit aligned with the installation surface. Compared with a single-hole strap, the two-hole design is often selected when the project requires more stable positioning or a more substantial attachment point.
The strap does not replace the complete support system. The installer must still select suitable screws, anchors, bolts, or threaded fasteners for the substrate and must follow the required support intervals, bonding provisions, and clearance rules for the project location. Exact requirements vary by jurisdiction, conduit size, installation method, and applicable electrical code.
Most EMT straps are identified by the nominal conduit trade size, such as 1/2 inch, 3/4 inch, or 1 inch. This trade size is a purchasing designation rather than a direct measurement of the conduit’s outside diameter. I therefore recommend matching the strap to the marked EMT size first, then checking the supplier’s dimensional drawing before approving a bulk order.
Common commercial size ranges may include 1/2 inch through 2 inches, with larger sizes available from selected manufacturers. The available range depends on the tooling, product standard, material, and intended market. A buyer should not assume that every supplier offers the same size series or hole spacing.
The most important dimensions are the strap’s internal width or radius, overall length, body height, material thickness, mounting-hole diameter, and center-to-center hole spacing. These dimensions determine whether the strap fits the EMT, sits correctly against the surface, and accepts the specified fastener. A product drawing is more reliable than a catalog title alone because similar trade sizes can have different profiles.
For procurement, I normally request dimensions in a controlled format, such as millimeters or inches, and ask the supplier to identify tolerances where they affect fit. For example, a mounting hole listed as 6.0 mm is not interchangeable with every fastener intended for a 1/4-inch hole. The buyer should also confirm whether the stated measurement is nominal, minimum, maximum, or subject to manufacturing tolerance.
| Specification | Why It Matters | What to Confirm |
|---|---|---|
| Nominal EMT size | Determines the intended conduit fit | 1/2 inch, 3/4 inch, 1 inch, or project-specific size |
| Internal profile | Controls contact with the conduit | Clearance, radius, and risk of deformation |
| Material thickness | Influences rigidity and forming consistency | Supplier drawing and applicable tolerance |
| Hole diameter and spacing | Controls fastener compatibility and alignment | Hole size, center distance, and edge distance |
Steel is commonly considered when the strap must provide a rigid mechanical support. A zinc-plated or otherwise coated steel surface may be selected for general indoor use, depending on the coating specification and the environment. I recommend confirming the coating type, coating coverage, forming quality, and corrosion expectations rather than relying only on the word “galvanized.”
Stainless steel may be appropriate for locations where corrosion resistance is an important purchasing criterion. The exact stainless grade should be stated in the quotation or technical documentation because different grades have different corrosion and mechanical characteristics. Stainless products can also have different tooling, lead-time, and cost implications than standard coated steel.
Aluminum can be considered where low weight, corrosion resistance, or compatibility with aluminum conduit and pipe systems is important. Because aluminum has different mechanical properties from steel, I would verify the strap thickness, forming method, fastening arrangement, and expected support load before substituting it. SIOSAN can discuss aluminum pipe and related component requirements when a project needs coordinated material selection.
For indoor commercial wiring, buyers often prioritize correct EMT size, consistent forming, suitable coating, and efficient installation. For outdoor, humid, coastal, or industrial locations, surface protection and material compatibility become more important. For corrosive environments, the strap, conduit, fastener, and mounting surface should be evaluated as a complete system rather than as isolated components.
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Mounting surface also affects the selection. Wood, concrete, masonry, steel framing, and equipment panels require different fasteners and may require different hole clearances. The two holes should be positioned so the installer can achieve firm attachment without cracking the substrate, interfering with adjacent equipment, or placing excessive stress on the conduit.
Before installation, I verify the conduit’s nominal size, route, bend locations, and support points. The strap should sit naturally around the EMT without forcing the conduit into an incorrect position. If the strap is too tight, too loose, or visibly distorted, I stop and confirm the part number and dimensions.
Place the strap over the conduit or position it at the planned support point, then mark both holes on the supporting surface. Using both holes helps preserve the intended stability of the fitting, but the selected fasteners must be appropriate for the substrate. Hole drilling should not damage concealed wiring, piping, reinforcement, or finished surfaces.
Install the screws, anchors, or bolts specified for the substrate and project conditions. Tighten the fasteners evenly so the strap remains seated and the EMT is not crushed or sharply loaded. The correct torque, if specified by the project or fastener manufacturer, should take priority over informal tightening practices.
After installation, inspect the conduit alignment, strap contact, fastener engagement, and surface condition. Confirm that the support spacing and clearance meet the applicable local requirements, since a correctly sized strap does not by itself prove that the entire installation is code compliant. Replace any strap that is cracked, badly deformed, poorly coated, or incompatible with the specified material system.
The first common mistake is ordering by conduit size without requesting the actual dimensional drawing. A second is overlooking the mounting-hole diameter and spacing, which can cause delays when the specified fastener does not fit. A third is selecting a low-cost coating for an environment that requires stronger corrosion protection.
Another mistake is using one strap material across every application without considering galvanic compatibility. Contact between dissimilar metals in the presence of moisture can increase corrosion risk, although the severity depends on the materials and environment. I also advise buyers to avoid mixing unverified strap dimensions from different suppliers within the same project when consistent installation appearance and fit are important.
For repeat orders, I compare more than unit price. I review minimum order quantity, tooling status, sample availability, production lead time, packaging, inspection records, and the supplier’s ability to maintain consistent dimensions across batches. A supplier that can provide a controlled drawing and clear specification is easier to manage than one that offers only a generic product description.
Lead time should be confirmed in writing because it may depend on material availability, production scheduling, tooling, surface treatment, and export preparation. If the project is time-sensitive, buyers can request a staged delivery plan or approve a standard size before discussing custom dimensions. These decisions should be based on confirmed supplier capacity rather than an assumed delivery promise.
At SIOSAN, I approach an EMT two hole strap inquiry by first confirming the conduit size, material preference, mounting environment, quantity, and destination market. We can then review the required dimensions, surface treatment, packaging, and documentation before quotation. For buyers working with aluminum pipes or related conduit components, coordinated material and size discussions can help reduce specification mismatches.
When a standard product does not match your installation, provide a drawing, sample, reference part, or dimensional schedule for review. I recommend confirming the final technical details before production, including the strap profile, hole pattern, material thickness, finish, inspection scope, and packing method. This process gives both sides a clearer basis for sampling and repeat supply.
The correct Electrical EMT two hole strap size is determined by more than a trade-size label. I recommend confirming the conduit size, internal fit, hole pattern, material, finish, fastener compatibility, and environmental requirements before approving the purchase. The final installation should also be checked against the applicable electrical code and the requirements of the project engineer or authority having jurisdiction.
For a quotation or technical review, prepare the EMT size, required material, surface finish, quantity, mounting surface, destination, and any drawing or sample reference. Send these details to SIOSAN so we can evaluate the suitable aluminum or related conduit component solution and clarify the commercial requirements before production.
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