Steel EMT Two Hole Strap Sizes and Selection Guide
Choose a steel EMT two-hole strap by matching its stated conduit trade size to the EMT, then confirm the strap’s fit, mounting-hole layout, material, finish, and project requirements before ordering. The conduit’s outside diameter is a useful cross-check, but it does not replace the manufacturer’s size designation or a physical fit confirmation. At SIOSAN, we recommend evaluating the complete installation and purchase specification—not selecting a strap by appearance alone. This guide explains the key size references and the questions B2B buyers can use to prepare a clear RFQ.
Key Takeaways
- Start with the EMT trade size shown on the conduit or project documents, and verify that the strap is specified for that size.
- Use conduit outside diameter as a secondary check; the dimensions below are approximate reference values.
- Confirm strap material, finish, hole arrangement, installation environment, and applicable project requirements.
- For purchasing, provide the size range, quantity, packaging needs, and any drawing or customization requirements when requesting a quotation.
Who This Guide Is For
This guide is for electrical distributors, contractors, OEM buyers, and project procurement teams sourcing steel straps for EMT conduit. It is especially useful when comparing supplier descriptions, reviewing a bill of materials, or preparing a request for quotation across several conduit sizes. We focus on selection and purchasing checks rather than prescribing an installation method. Always follow the applicable electrical code, project specifications, and product instructions for the installation.
What Is a Steel EMT Two-Hole Strap?
A steel EMT two-hole strap is a formed metal fitting used to secure electrical metallic tubing to a supporting surface. It wraps around part of the conduit and uses two mounting holes for fastening. Buyers may also encounter names such as two-hole EMT strap or two-hole conduit strap, so it is helpful to confirm the product description and intended conduit type in the supplier’s quotation. A strap intended for another conduit type or a different nominal size should not be assumed interchangeable.
How the Size Is Identified
EMT is commonly identified by trade size, which is a nominal designation rather than a direct measurement of the tube’s outside diameter. A buyer should therefore use the stated trade size as the primary ordering reference and use the diameter only to help check the specification. The following values are approximate reference dimensions for common EMT sizes; confirm the applicable standard and product details for the market and project. Minor presentation or rounding differences may appear across technical documents.
| EMT Trade Size | Approximate Outside Diameter | Buyer Check |
|---|---|---|
| 1/2 in | 0.706 in (17.9 mm) | Confirm the strap is designated for 1/2 in EMT. |
| 3/4 in | 0.922 in (23.4 mm) | Do not substitute based on visual similarity to another size. |
| 1 in | 1.163 in (29.5 mm) | Check the product drawing or sample if fit is critical. |
| 1-1/4 in | 1.510 in (38.4 mm) | Confirm both conduit compatibility and mounting layout. |
| 1-1/2 in | 1.740 in (44.2 mm) | Review the supplier’s size range and stated dimensions. |
| 2 in | 2.197 in (55.8 mm) | Check the project specification before approving an alternative. |
Materials, Finishes, and Specifications
Steel is the material specified by this product category, but buyers may need to distinguish among steel grades, thicknesses, and surface finishes. These details can affect product weight, corrosion considerations, appearance, and compatibility with the project environment. Do not infer a grade or coating from a generic product name or photograph. Request the manufacturer’s written specification when the purchase order requires a defined material or finish.
What to Confirm in a Product Specification
- Conduit type and trade size: State EMT and each required nominal size clearly.
- Material: Ask for the specified steel type or grade where the project requires one.
- Finish: Identify the required coating or surface treatment and intended environment.
- Geometry: Confirm strap width, formed profile, mounting-hole diameter, and hole spacing when these affect installation.
- Documentation: Request available drawings, dimensional details, or product information needed for internal approval.
Not every supplier will offer the same material or finish options, and not every project needs the same level of specification. Where the application has exposure, corrosion, or compatibility requirements, have the responsible project professional confirm the appropriate product. We recommend documenting agreed dimensions and finish in the quotation or purchase order to reduce ambiguity between samples, production, and delivery.
Match the Strap to the Application
Two-hole straps are used in conduit support arrangements where the specified fitting and mounting method call for two fastening points. The right choice depends on more than the conduit size: the mounting surface, available clearance, fastener selection, environmental conditions, and project requirements also matter. A buyer should check whether the strap geometry suits the installation location and whether the specified fasteners are compatible with the substrate. Installation spacing and support requirements should come from the applicable code and project documents, not from a general product guide.
With competitive price and timely delivery, SIOSAN sincerely hope to be your supplier and partner.
A Practical Selection Framework
1. Confirm the Conduit
Read the conduit marking, bill of materials, or project drawing to identify the conduit type and trade size. If the information is incomplete, measure the conduit outside diameter and ask the project team or supplier to confirm the intended designation. Do not order solely by a rough measurement, especially when multiple conduit types are present. Keep the trade size and measured diameter together in the RFQ if there is any uncertainty.
2. Check Fit and Mounting Details
Compare the supplier’s stated size and available drawing with the conduit and installation layout. Review the strap’s formed profile, hole dimensions, and hole spacing if the mounting position is constrained or must align with existing hardware. If a drawing is unavailable, request one or arrange to evaluate a sample before approving a large order. Avoid assuming that two straps labeled for the same trade size have identical dimensions.
3. Define Environment and Requirements
Specify where the product will be used and what material or finish requirements apply. Indoor, outdoor, and other exposure conditions may lead to different project requirements, so ask the responsible engineer or buyer to confirm the required finish. Where a specification calls for compliance documentation, identify the exact document needed and verify whether the supplier can provide it. Do not treat a general product description as proof of certification or code approval.
4. Review Supply and Commercial Terms
Compare quotations on the same basis: size, material, finish, drawing revision, quantity, packaging, and delivery destination. Price, minimum order quantity, and lead time can vary by specification, order volume, production schedule, and shipping arrangements; request current terms rather than relying on general estimates. For a multi-size order, list quantities by size so the supplier can quote the actual product mix. Confirm how substitutions or changes will be handled before placing the order.
Supplier Evaluation Checklist
A dependable sourcing process starts with a supplier that can explain the offered product and document what is being quoted. Ask whether the supplier can provide size-specific details, clarify available steel and finish options, and review drawings or samples when needed. For custom requirements, confirm which dimensions can be adjusted, what information is needed to assess feasibility, and whether any tooling or minimum quantity conditions apply. These are questions to verify directly; capabilities and terms differ among manufacturers.
- Does the quotation name the conduit type and trade size for every item?
- Are material, finish, and critical dimensions stated rather than assumed?
- Can the supplier provide a drawing or sample for fit review where required?
- Are MOQ, packaging, lead time, and shipping terms clearly listed?
- Are any requested documents identified and confirmed before order placement?
Conclusion: Select by Trade Size, Then Verify the Details
To choose a steel EMT two-hole strap, begin with the EMT trade size, use outside diameter as a cross-check, and verify the strap’s fit, material, finish, and mounting dimensions against the project requirements. The approximate diameter values in this guide can help identify mismatches, but the supplier’s product specification and the applicable project documents should guide final approval. Before purchasing, provide a size-by-size quantity list and state any required finish, drawing, sample, packaging, or documentation needs. SIOSAN can review your inquiry and discuss available steel strap specifications and supply options; send us your required sizes and project details to begin a quotation discussion.