Choosing the correct EMT two hole conduit strap starts with matching the strap to the conduit’s nominal trade size and confirming that the strap holds the conduit firmly without crushing or distorting it. For most projects, I recommend identifying the EMT size, selecting a compatible strap material, checking the mounting-hole arrangement, and then installing the strap on a sound surface with suitable fasteners. A two hole strap provides two fixing points, which generally gives more stable support than a single-hole strap, especially where vibration or alignment matters.
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Common EMT trade sizes include 1/2 inch, 3/4 inch, 1 inch, 1-1/4 inch, 1-1/2 inch, and 2 inches. As reference examples, the outside diameter of 1/2-inch EMT is approximately 0.706 inch, while 1-inch EMT is approximately 1.163 inches; actual requirements should always be checked against the applicable conduit standard and the manufacturer’s dimensional drawing. In this guide, I explain how to select, install, and source an EMT Two Hole Conduit Strap for commercial, industrial, and building-services applications.
This guide is intended for electrical contractors, conduit installers, wholesalers, project engineers, purchasing teams, and distributors who need a practical method for selecting EMT two hole straps. It is also useful for buyers comparing aluminum, steel, and other material options for conduit support systems. I focus on product selection and installation principles rather than replacing local electrical codes, engineering specifications, or job-site safety procedures.
For procurement teams, the most important questions are usually straightforward: Which strap size is required? Which material suits the environment? How many pieces are needed? What details should be confirmed with the supplier before ordering? Answering these questions early can reduce mismatched inventory, installation delays, and unnecessary replacement costs.
An EMT two hole conduit strap is a fastening component designed to secure electrical metallic tubing to a wall, ceiling, support frame, or other approved mounting surface. The strap wraps around the outside of the conduit, while two holes allow the installer to attach it using suitable screws, bolts, or other approved fasteners. Its primary functions are mechanical support, conduit alignment, and restriction of unwanted movement.
The strap must fit the outside profile of the EMT without excessive looseness or excessive compression. A correctly selected strap supports the conduit while allowing the installation to remain neat and serviceable. The mounting surface and fastener selection are equally important because even a well-made strap cannot compensate for weak substrate conditions or unsuitable fixing hardware.
Aluminum straps are often considered where low weight, corrosion resistance, and compatibility with aluminum conduit or aluminum piping systems are priorities. They can be practical for projects where installers want easier handling during repetitive overhead or wall-mounted work. However, the final choice should consider the environment, mechanical loading, galvanic compatibility, and project specifications.
As a manufacturer and supplier serving the aluminum pipes and conduit fittings sector, I recommend checking the alloy, surface condition, forming quality, and dimensional tolerance before approving a large order. The material description alone is not enough to confirm suitability. Buyers should request product drawings, sample verification, and any available material documentation that applies to the specific order.
Steel straps may be selected when a project requires a more rigid fastening component or follows a steel-based conduit support specification. Coated or plated finishes can help address environmental exposure, but the coating type should be matched to the installation conditions. Outdoor, humid, coastal, chemical, or high-temperature locations may require more careful review than standard indoor spaces.
I advise buyers not to assume that a visually similar finish provides identical corrosion performance. The supplier should clearly state the base material, finish, available sizes, and packaging information. If the strap will contact a different metal, the project team should also review possible galvanic corrosion concerns instead of relying only on appearance.
The first selection rule is simple: match the strap to the EMT trade size, not only to a ruler measurement taken at the job site. The strap’s internal profile should correspond to the conduit outside diameter and should not interfere with couplings, connectors, bends, or other fittings. For example, a strap specified for 1/2-inch EMT should not automatically be used for 3/4-inch EMT just because the difference appears small.
| EMT Trade Size | Reference Outside Diameter | Selection Consideration |
|---|---|---|
| 1/2 inch | Approximately 0.706 inch | Confirm the strap profile and hole access for compact installations |
| 3/4 inch | Approximately 0.922 inch | Check clearance around adjacent conduits and fittings |
| 1 inch | Approximately 1.163 inches | Verify the mounting surface and fastener engagement |
| 1-1/4 to 2 inches | Varies by nominal size and standard | Use the supplier’s dimensional drawing before bulk purchase |
The dimensions in the table are reference values for common EMT trade sizes, not a substitute for the applicable standard or product drawing. Different standards, manufacturing tolerances, and product designs can affect the final fit. When the conduit and strap come from different suppliers, I recommend confirming the actual outside diameter range and strap inside width before placing the order.
Before installation, inspect the conduit route, support spacing requirements, and mounting surface. Confirm that the surface is structurally suitable for the selected fasteners and that the strap will not interfere with access panels, joints, valves, or other services. The required support interval should come from the applicable electrical code, project specification, or engineer-approved installation detail rather than from a universal assumption.
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Place the strap around the EMT or compare it with the conduit before fixing it in position. The strap should sit evenly around the conduit, with no sharp edge pressing into the tube. Do not force an undersized strap into place, and do not use an oversized strap where the conduit can move excessively after fastening.
Use the two mounting holes as a guide and mark both fixing points on the approved surface. Drilling should follow the requirements of the substrate, anchor system, and fastener manufacturer. Keeping both holes aligned helps the strap distribute the holding force more evenly and supports a cleaner finished installation.
Install suitable fasteners through both holes and tighten the strap until the conduit is secure. Over-tightening can deform the conduit, damage a protective finish, or strip the fixing point, while under-tightening may permit movement. I recommend a final visual and physical check to confirm that the strap is stable and that the conduit remains aligned.
After installation, inspect the full run for unsupported sections, sharp contact points, loose fasteners, and interference with other components. Confirm that connectors and couplings remain accessible where required by the project. If the installation is exposed to vibration, moisture, or thermal movement, record the selected support method and obtain engineering or code-based confirmation where necessary.
Size accuracy is the first purchasing priority because an incorrect internal profile can create installation and support problems. Ask for the nominal EMT size range, internal width or diameter, overall length, hole diameter, and center-to-center hole spacing. A dimensioned drawing is especially valuable when the strap must fit inside a crowded cable tray, equipment enclosure, or prefabricated support assembly.
Choose the material based on corrosion exposure, mechanical requirements, weight, compatibility, and local specifications. Aluminum may be attractive for lightweight systems, while steel or coated options may be preferred for other structural or environmental requirements. If the project includes aluminum pipes, aluminum conduit, or mixed-metal assemblies, I recommend reviewing contact compatibility before approving the final material.
For wholesale and project orders, confirm minimum order quantity, pieces per carton, carton dimensions, labeling, and shipment terms. Lead time depends on the selected size, material, tooling status, quantity, packaging, and production schedule, so I avoid presenting one universal delivery promise. A supplier should provide a written quotation that separates product availability from any estimated production or shipping time.
Another frequent mistake is ordering only by conduit size without confirming the complete assembly. The strap may need to work with insulation, surface coatings, nearby fittings, or a special mounting bracket. I recommend reviewing a sample against the actual conduit and installation surface before releasing a large production order.
When comparing suppliers, I suggest evaluating more than unit price. Check whether the supplier can provide stable dimensions, consistent forming, clear material descriptions, protective packaging, and responsive technical communication. For repeat purchasing, ask how the supplier manages size identification, batch traceability, inspection records, and replacement handling when a discrepancy is discovered.
SIOSAN supports B2B buyers by discussing EMT two hole strap sizes, aluminum-related conduit applications, product drawings, packaging requirements, and order coordination. Depending on the project, we can review standard configurations and discuss whether a requested size, material, finish, or labeling requirement needs additional confirmation. I encourage buyers to send the EMT trade size, intended environment, estimated quantity, destination, and any drawing or specification before requesting a formal quotation.
The right EMT Two Hole Conduit Strap is determined by conduit size, material, environment, mounting surface, and project requirements—not by appearance or price alone. A correct installation uses a properly fitting strap, two suitable fixing points, controlled tightening, and support spacing confirmed by the applicable standard. For reliable sourcing, I recommend validating dimensions and samples before finalizing a production or wholesale order.
To begin, prepare your EMT trade sizes, required material, finish preference, estimated quantity, packaging needs, and delivery destination. Share those details with SIOSAN, and I can help review the suitable strap configuration, available documentation, and quotation requirements for your aluminum pipe or EMT conduit fitting project.
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