Two Hole Strap for EMT Conduit: Sizes, Uses, and Installation Guide

A two-hole strap for EMT conduit is a fastening accessory with two mounting holes that secures electrical metallic tubing to a supporting surface. To choose one, match the strap to the conduit’s trade size, confirm the material and finish suit the environment, and select fasteners appropriate for the mounting surface. During installation, position the strap to support the conduit without crushing or deforming it, and follow the project’s applicable electrical code and installation requirements. This guide explains common sizes, applications, selection considerations, and a practical installation sequence.

Please visit our website for more information on this topic.

Key Takeaways

• Choose a strap by EMT trade size, not by assuming the trade size is the tube’s outside diameter.
• Two mounting points can help keep the strap stable, but the right fastener and supporting surface remain essential.
• Material, finish, hole layout, project environment, and supply requirements should be checked before ordering.
• Confirm actual product dimensions and compatibility with your supplier before committing to a large or custom order.

Who This Guide Is For

This guide is intended for electrical contractors, project purchasers, distributors, and OEM buyers sourcing supports for EMT conduit. It is also useful for teams comparing strap materials or preparing a bill of materials for a commercial, industrial, or residential project. The information is general selection guidance, not a substitute for the project drawings, local requirements, or the product manufacturer’s instructions. When specifications differ, use the requirements approved for the job.

What Is a Two-Hole Strap for EMT?

A two-hole strap is a formed band that wraps around or partially encloses conduit and attaches to a wall, ceiling, framing member, or other suitable support through two mounting holes. Its purpose is to hold the conduit in its intended route and limit unwanted movement. The strap does not replace conduit fittings, electrical bonding components, or structural supports that a design may require. Select it as one component of the complete installation system.

How It Differs from a One-Hole Strap

A one-hole strap uses a single mounting point, while a two-hole strap uses two. The additional attachment point can help resist rotation when the strap is installed on a suitable, solid surface with compatible fasteners. It does not automatically make an installation compliant or appropriate for every load condition. The conduit support method and spacing must still meet the project requirements and applicable code.

Common EMT Sizes and Conduit Dimensions

EMT is identified by trade size, which is a nominal designation rather than its exact outside diameter. The values below are common EMT outside diameters for reference when coordinating conduit and supports. They are not strap inside dimensions, so check the supplier’s dimensional drawing or fit information before ordering. Exact product fit can depend on the strap design and manufacturing tolerances.

These figures are provided as general reference dimensions and should be verified against the standard and product documentation used for your project. Do not select a strap only by measuring its width or comparing it visually with a conduit sample. For nonstandard, coated, or unusually configured tubing, share the actual conduit details with the supplier before purchase. A dimensional drawing can help prevent fit and installation issues.

Materials, Finishes, and Applications

Straps may be offered in different base materials and finishes, depending on the supplier and product line. Steel options are common in general-purpose support applications, while stainless steel or protective finishes may be considered where corrosion exposure is a concern. Aluminum options may be relevant when a project specifies aluminum components or has particular material compatibility requirements. Confirm the available material, finish, and intended environment rather than assuming that a product is suitable for every location.

If you are looking for more details, kindly visit SIOSAN.

Match the Strap to the Installation Environment

For indoor, dry locations, buyers typically focus on trade size, fit, finish, and mounting method. In damp, outdoor, or corrosive environments, evaluate the material and coating alongside the exposure conditions and other system components. Where dissimilar metals meet, ask the project engineer or supplier to review compatibility for the application. The correct choice depends on the full installation context, not on material name alone.

How to Select the Right Two-Hole Strap

1. Identify the conduit: Record its type and trade size, and confirm whether it is standard EMT or another tubing type.
2. Check fit information: Request the strap’s dimensions or product drawing and compare them with the conduit specification.
3. Define the environment: Note indoor or outdoor use, moisture exposure, corrosive conditions, and any project material requirements.
4. Review the mounting surface: Identify whether the strap will attach to wood, concrete, steel, or another substrate.
5. Confirm fasteners and layout: Verify hole spacing, hole size, and compatible fasteners for the substrate and project design.
6. Check project requirements: Confirm support locations, spacing, and installation details against approved drawings and applicable code.

Buyers should also consider packaging, order quantity, labeling, and the consistency of repeat supply. For projects with multiple conduit sizes, request a size-by-size quotation rather than assuming one strap design covers the full range. If a custom hole layout, material, or finish is needed, provide a drawing and target quantities so the supplier can assess feasibility. SIOSAN can review product requirements for EMT support accessories and discuss suitable supply options based on the information provided.

Installation Guide

A careful installation begins with the approved conduit route and the right support locations. The following sequence is general guidance; use the strap manufacturer’s instructions and the project’s governing requirements wherever they provide more specific direction. Do not use a strap that is visibly damaged, incorrectly sized, or incompatible with the selected fastener. If the substrate or installation condition is uncertain, consult the responsible project professional.

Step-by-Step Installation

1. Plan the route: Mark the conduit path and intended support points in accordance with the project drawings and applicable requirements.
2. Position the conduit: Place the EMT along the route and check alignment before fixing the straps.
3. Align the strap: Center the strap around the conduit at the selected support point, keeping both mounting holes against the supporting surface.
4. Install compatible fasteners: Use fasteners selected for the substrate and strap hole dimensions. Follow the fastener maker’s instructions for installation.
5. Secure without crushing: Tighten the fasteners evenly so the strap holds the conduit firmly without visibly deforming it.
6. Inspect the assembly: Check that the conduit remains aligned, the strap is seated, and the fasteners are secure.

Common Installation Mistakes

Using a strap based only on a rough visual match can lead to poor fit, while choosing fasteners without regard to the substrate can undermine the attachment. Overtightening may distort the strap or conduit, and uneven fastening can leave the assembly misaligned. Another common error is treating the strap itself as proof that support spacing or the overall installation meets code. Verify the complete installation against the applicable project requirements.

Pricing, MOQ, and Lead-Time Considerations

Pricing for a two-hole EMT strap can vary with size, material, finish, order quantity, packaging, and any requested customization. Minimum order quantities and lead times also depend on the supplier’s stock position and production plan, so they should be confirmed for the specific part number and destination. Rather than relying on a generic estimate, provide the required sizes, quantities, material preference, finish, and delivery schedule when requesting a quotation. For repeat purchases, ask how product identification and dimensional consistency will be managed between orders.

Supplier Evaluation Checklist

• Can the supplier confirm the intended EMT trade size and provide product dimensions?
• Are material and finish options clearly identified for the requested application?
• Can the supplier review a drawing or sample when a fit or customization question arises?
• Are MOQ, packaging, lead time, and shipping terms stated for the requested quantities?
• Is there a clear process for confirming specifications before production or shipment?

Conclusion: Choose by Fit, Environment, and Installation Requirements

The right two-hole strap for EMT conduit matches the conduit’s trade size, fits the product dimensions, suits the installation environment, and works with the mounting surface and fasteners. Start by confirming the conduit size, then review the strap drawing, material, finish, hole layout, and project support requirements. During installation, secure the strap without deforming the conduit and inspect the completed assembly. For purchasing support, send SIOSAN your required sizes, quantities, material or finish preferences, and delivery needs to discuss an appropriate supply option.