Galvanized EMT Two Hole Strap: Sizes, Fit, and Installation Guide
A galvanized EMT two hole strap secures electrical metallic tubing (EMT) to a mounting surface using two fasteners. To choose the right one, match the strap’s stated trade size to the EMT size, then confirm that the strap’s inside profile, material, finish, and mounting arrangement suit the installation. For example, standard EMT outside diameters are 0.706 in for 1/2-in trade size, 0.922 in for 3/4-in, and 1.163 in for 1-in. Always check the product drawing and applicable installation requirements before ordering or installing.
This guide is intended for electrical contractors, distributors, project buyers, and OEM or fabrication teams evaluating galvanized two hole straps for EMT runs. It explains how nominal sizes relate to fit, what to check when comparing products, and how to install a strap without relying on guesswork. Because strap dimensions and coating details can vary by supplier, the product specification—not the product name alone—should guide purchasing decisions.
Key Takeaways
- Choose a strap marked for the EMT trade size, and verify its dimensions against the intended conduit and product drawing.
- A two hole design uses two mounting points to secure the conduit; the surface, fasteners, and installation conditions still determine suitability.
- Confirm base material, galvanizing or other coating description, hole layout, quantity, packaging, and applicable project requirements before placing a bulk order.
- During installation, position the strap to support the conduit without crushing, distorting, or obstructing it.
What Is a Galvanized EMT Two Hole Strap?
A two hole strap is a formed conduit support with a curved section that sits over EMT and two mounting holes, typically one on each side of the conduit. Installers use it to hold a conduit run against a wall, ceiling, framing member, or other suitable surface. The two fastener points provide a defined mounting arrangement, but do not by themselves establish a load rating or suitability for every surface.
“Galvanized” describes a zinc coating applied to steel to provide corrosion protection. The exact coating method, thickness, and performance depend on the product specification and manufacturing process, so buyers should request details rather than assume all galvanized straps are equivalent. For damp, outdoor, chemical, or otherwise corrosive environments, confirm that the selected finish and the rest of the installation are appropriate for the exposure.
Sizes, Dimensions, and Fit
Match trade size, then verify actual dimensions
EMT is commonly ordered by trade size, which is a nominal designation rather than a direct measurement of the tube’s outside diameter. A strap labeled for a particular trade size is intended for that conduit category, but fit can also depend on the strap’s formed radius, width, and manufacturing tolerances. If the strap is too tight, it may be difficult to seat or could put unwanted pressure on the conduit; if it is too loose, it may not restrain the tube as intended.
| EMT Trade Size | Typical EMT Outside Diameter | Buyer Check |
|---|---|---|
| 1/2 in | 0.706 in | Confirm strap marking and formed inside profile |
| 3/4 in | 0.922 in | Check fit using the intended conduit or drawing |
| 1 in | 1.163 in | Verify hole layout and strap width for the mounting surface |
These outside-diameter figures are reference dimensions for common EMT trade sizes, not a substitute for checking the applicable product standard, project specification, or supplier drawing. Larger sizes may also be available, but a supplier’s size range should be confirmed for the specific strap design. If a project uses more than one conduit type, do not assume that EMT straps will fit rigid metal conduit, flexible conduit, or tubing with a different outside diameter.
Material and finish options
Most galvanized straps are steel, while some projects may specify a different base material or finish for environmental, weight, or compatibility reasons. When comparing options, ask whether the product is steel or another material, how the surface is protected, and whether the description applies to the finished part or only the raw material. For mixed-metal installations, evaluate the full assembly and site exposure for corrosion compatibility instead of selecting a strap based on appearance alone.
How to Select the Right Strap
Use a practical selection framework
- Identify the conduit. Confirm that the tube is EMT and record its trade size, outside diameter where available, and any project-specific specification.
- Confirm the strap fit. Compare the product’s stated size and drawing with the conduit. If dimensions are not published, request a dimensional confirmation or sample before committing to a large order.
- Review the mounting arrangement. Check the distance between holes, hole diameter, strap width, and the planned fastener type against the mounting surface and installation method.
- Evaluate the environment. Specify the required base material and corrosion-protection finish based on indoor, outdoor, damp, or other site conditions.
- Check project requirements. Confirm any applicable electrical code, inspection, engineering, or customer requirements with the responsible project professional.
- Plan procurement. Compare packaging, quantity, documentation, sample availability, minimum order quantity, and delivery schedule with the project timeline.
Common fit and purchasing mistakes
A frequent mistake is treating trade size as the conduit’s exact outside diameter. Another is ordering by a short product description without checking hole dimensions, material, or finish, especially when a project requires repeatable parts across multiple installation locations. Buyers can reduce uncertainty by sharing a drawing, sample, or complete dimensional specification during quotation.
Link to SIOSAN
Do not assume that “galvanized” means a particular coating thickness, corrosion life, or compliance status. Those details require product-specific documentation and should be verified against the project’s requirements. Similarly, avoid assuming that two hole straps have a defined load capacity unless the supplier provides applicable data for the product and installation conditions.
Installation Guide
Step-by-step process
- Prepare the work area. Follow site safety procedures and ensure the circuit and work area are in a safe condition. Confirm the mounting location and the required support arrangement with the project documents.
- Position the EMT. Route the conduit along the intended path and align it with the mounting surface. Check that the tube is seated where the strap will pass over it and that nearby fittings or bends do not interfere.
- Place the strap. Center the curved section over the EMT and align both holes with the mounting points. The strap should sit evenly over the conduit rather than at an angle or across an obstruction.
- Install suitable fasteners. Select fasteners appropriate for the substrate and installation requirements. Secure both mounting points using the approved method, while avoiding excessive force that could deform the strap or conduit.
- Inspect the completed support. Check that the strap is secure, the conduit remains aligned, and there is no visible crushing, sharp interference, or looseness. Repeat the inspection along the run according to the project specification and applicable rules.
Installation spacing is not universal: it can depend on the applicable code, conduit size, routing, support conditions, and project requirements. Use the governing code and approved project documents to determine support locations rather than applying a spacing rule from a different installation. If the substrate is uncertain or the run has unusual loads or environmental conditions, consult the responsible qualified professional.
Pricing, MOQ, and Lead-Time Considerations
For B2B orders, unit pricing can be affected by size, material, coating specification, order quantity, packaging, and any requested customization or documentation. Minimum order quantities and lead times vary by supplier, stock position, and production requirements, so they should be confirmed for each quotation. For repeat purchasing, aligning the drawing revision, size range, finish description, and packaging instructions can help reduce discrepancies between orders.
Supplier Evaluation Checklist
Before selecting a supplier, request a product drawing or dimensional specification that identifies trade size, key dimensions, material, finish, and hole layout. Ask how the supplier handles sample review, production changes, packaging, and inspection documentation, and clarify which requirements can be supported for your order. If you are sourcing for export or a multi-site project, confirm labeling, carton quantities, shipping terms, and delivery expectations at the quotation stage.
SIOSAN supports B2B buyers evaluating galvanized EMT two hole straps and related conduit hardware. Share your EMT trade sizes, required finish, target quantities, destination, and any drawings or project specifications so our team can review the requested configuration and confirm available supply details. Product availability, customization, MOQ, and lead time should be verified in the quotation for your specific order.
Conclusion: Choose by Verified Fit and Project Requirements
The right galvanized EMT two hole strap is the one that matches the EMT trade size, fits the tube’s dimensions, suits the mounting arrangement, and meets the project’s material and finish requirements. Begin by confirming the conduit and reviewing a supplier drawing, then check fastener layout, environmental conditions, and applicable installation rules. For procurement, provide a complete specification and confirm quantity, packaging, MOQ, and lead time before issuing a purchase order.
For a project-specific review, send SIOSAN your required sizes, finish, order quantity, and drawings or specifications. This gives our team the information needed to respond with relevant product and sourcing details for your evaluation.