Metal EMT Two Hole Strap: Sizes, Dimensions, and Installation Guide
A metal EMT two hole strap is a support fitting that holds electrical metallic tubing against a wall, ceiling, or other mounting surface using two fasteners. To choose one, match its nominal trade size to the EMT, confirm that the strap profile fits the conduit’s outside diameter, and select a material and finish suited to the installation environment. Strap dimensions can differ by manufacturer, so do not rely on trade size alone: check the supplier’s drawing and mounting-hole details before ordering. During installation, support spacing and fastening must follow the applicable electrical code and project requirements.
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Quick Takeaways
- Match the strap’s stated EMT trade size to the conduit, then verify fit against the product drawing.
- Consider the mounting surface, exposure conditions, fastener type, and required corrosion resistance.
- As a commonly used U.S. reference, EMT outside diameter is 0.706 in (17.9 mm) for 1/2-in trade size and 0.922 in (23.4 mm) for 3/4-in trade size.
- Plan support locations according to the current local code and project specifications; do not treat a typical spacing rule as a substitute for code review.
- Ask suppliers to confirm dimensions, material, finish, packaging, and lead time before placing a bulk order.
What a Metal EMT Two Hole Strap Does
The strap wraps around part of an EMT conduit and provides two mounting points for screws or other suitable fasteners. Compared with a single-hole strap, its two-point attachment can help resist rotation when properly matched to the surface and installed with compatible fasteners. It is commonly used to route and secure conduit along walls, ceilings, and structural surfaces in commercial, industrial, and building projects.
A strap is a support component, not a substitute for a connector, coupling, or conduit body. It does not join conduit sections or terminate a conduit run. In a complete installation, the strap works alongside those fittings to keep the pathway organized and supported.
Sizes and Dimensions
Understand EMT Trade Size and Outside Diameter
EMT is ordered by nominal trade size, which is not the same as its measured outside diameter. A strap marked for a particular trade size is designed for the corresponding conduit size, but the strap’s inside profile and overall dimensions are product-specific. For this reason, use the trade size to identify the intended fit and the manufacturer’s drawing to confirm the physical details.
| EMT trade size | Common EMT outside diameter | What to confirm for the strap |
|---|---|---|
| 1/2 in | 0.706 in (17.9 mm) | Fit, strap width, hole spacing, and fastener clearance |
| 3/4 in | 0.922 in (23.4 mm) | Fit, strap width, hole spacing, and fastener clearance |
| 1 in | 1.163 in (29.5 mm) | Fit, strap width, hole spacing, and fastener clearance |
| 1-1/4 in | 1.510 in (38.4 mm) | Fit, strap width, hole spacing, and fastener clearance |
The outside-diameter values above are common U.S. EMT reference dimensions; confirm the applicable product standard and market before finalizing a specification. They describe the conduit, not the strap. Strap length, width, thickness, hole diameter, hole-center spacing, and bend profile can vary between designs, so request a current technical drawing when those dimensions affect installation or procurement.
Material and Finish Options
Metal straps may be available in steel, aluminum, or other materials, depending on the supplier’s range. A protective finish, such as a plated or coated surface, may also be offered for certain products. Compare the material and finish with the environment, conduit material, project specification, and any corrosion-control requirements rather than assuming that one option is suitable for every location.
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How to Select the Right Strap
Use This Selection Framework
- Identify the conduit. Confirm that it is EMT and record its trade size. Do not select a strap solely by measuring a nearby fitting or another conduit type.
- Check the fit. Match the listed strap size to the EMT trade size and review the supplier’s drawing. If the conduit is coated or the fit is unusually tight, ask the supplier to clarify the intended compatibility.
- Review the installation surface. The two mounting holes must align with a suitable base, and the selected fasteners must be appropriate for that material. Confirm that the surface can support the planned installation.
- Choose material and finish. Consider indoor or outdoor exposure, moisture, nearby materials, and the project specification. Seek technical guidance where corrosion compatibility is uncertain.
- Confirm order details. Specify the trade size, material, finish, drawing revision, quantity, packaging, and destination market when requesting a quotation.
For projects with several conduit sizes, make a size schedule before ordering. This reduces the chance of mixing straps that look similar but are intended for different EMT trade sizes. If the project requires nonstandard hole spacing, material, or labeling, ask whether a custom option is available and request written confirmation before production.
Installation Guide
Step-by-Step Process
- Plan the route. Mark the conduit path and support locations, taking account of boxes, terminations, bends, access, and the project’s support requirements.
- Position the EMT. Place the conduit against the mounting surface and align the strap over it. The strap should sit evenly without forcing the EMT out of line.
- Mark and prepare the mounting points. Use the strap’s holes as a guide. Select and install fasteners suitable for the substrate, following the fastener and project instructions.
- Secure the strap. Tighten both fasteners evenly so the strap retains the conduit without visibly deforming it. Avoid inventing a torque value; use one only when the product or project documentation specifies it.
- Inspect the run. Check that the EMT is held securely, remains aligned, and has no visible damage. Recheck supports near boxes and other termination points against the applicable code.
As a common U.S. NEC reference, EMT is generally required to be securely fastened at intervals not exceeding 10 ft (3 m) and within 3 ft (900 mm) of a box, cabinet, conduit body, or other termination, subject to applicable exceptions and edition requirements. This is a planning reference, not a universal rule for every jurisdiction or installation. Confirm the current code adopted locally and any project-specific requirements before setting support locations.
Common Selection and Installation Mistakes
- Confusing trade size with actual diameter: EMT trade size is nominal, so use the correct size marking and supplier fit information.
- Assuming all straps have identical dimensions: Compare drawings for hole spacing, width, profile, and material thickness when interchangeability matters.
- Using unsuitable fasteners: A correctly sized strap can still be poorly secured if the fastener does not suit the mounting surface or environment.
- Over-tightening: Excessive tightening may distort a strap or damage the conduit. Tighten evenly and follow documented instructions.
- Ignoring local requirements: Support spacing and acceptable installation methods depend on the governing code and project conditions.
Pricing, MOQ, and Lead-Time Questions
Quotation details depend on the requested size range, material, finish, order quantity, packaging, and delivery destination. Minimum order quantity and production or shipping lead time can vary by specification and current availability, so request confirmation for the exact configuration rather than relying on a general estimate. For repeat purchasing, provide an approved drawing or specification and ask the supplier to identify any changes between quotations or production batches.
Supplier Evaluation Checklist
Before purchasing, ask the supplier to confirm the intended EMT trade size, dimensional drawing, material and finish, available quantity, packaging, and delivery schedule. If the strap is part of a regulated or engineered project, request the documentation required by that project and verify it independently. Avoid treating a general product description as proof of a particular certification, test result, or code approval.
Conclusion: Confirm the Fit Before You Order
The right metal EMT two hole strap is the one specified for your conduit trade size, verified against its dimensional drawing, and suited to the mounting surface and environment. Use code-compliant support locations, suitable fasteners, and an installation method that secures the EMT without damaging it. Before a bulk order, prepare a size and finish schedule and confirm all order details with the supplier.
SIOSAN supports B2B buyers seeking metal EMT two hole straps and related sourcing information. Share your required trade sizes, material or finish preference, quantity, destination, and any drawing or project specification so the team can confirm available options and prepare a quotation for your review.