I use a zinc-plated EMT two hole strap when I need to secure electrical metallic tubing (EMT) to a wall, ceiling, panel, or structural surface with two separate fastening points. The correct strap should match the outside diameter of the EMT, provide stable contact without crushing the conduit, and suit the installation environment. Before ordering, I recommend confirming the conduit size in millimeters, the base material and finish, the hole pattern, the required fasteners, and the expected quantity.
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This guide explains how I evaluate, purchase, and install zinc-plated EMT two hole straps for commercial, industrial, and building-service applications. It also identifies common sourcing mistakes, practical supplier questions, and situations where another material or support method may be more appropriate.
I prepared this guide for electrical procurement teams, electrical contractors, installers, distributors, and project engineers who need dependable EMT support hardware. It is also useful for buyers comparing standard products with customized packaging, hole spacing, or finish requirements. The guidance applies to individual maintenance orders as well as larger construction and OEM supply programs.
Product selection should always follow the applicable electrical code, project specification, and local installation requirements. A strap is a mechanical support component, but the complete installation may also involve grounding continuity, conductor protection, corrosion exposure, and structural loading considerations.
A zinc-plated EMT two hole strap is a formed metal clamp designed to hold EMT conduit against a mounting surface. It normally wraps around the conduit and uses two holes for screws, bolts, or other suitable fasteners. The zinc coating is intended to provide a protective surface against ordinary handling and atmospheric exposure, while the two-hole design distributes the attachment load across two fixing points.
The strap does not replace the conduit, connector, coupling, anchor, or building structure. Its job is to maintain the conduit position and reduce movement after the assembly has been properly fastened. The final performance depends on the strap geometry, material thickness, coating condition, fastener selection, substrate, spacing, and installation method.
Zinc-plated steel is a common choice for indoor and general-purpose EMT support applications. The steel provides the formed shape and mechanical support, while the zinc layer offers a degree of surface protection. I still recommend checking the coating specification because “zinc plated” can describe different coating processes, thicknesses, and appearance requirements.
For damp, coastal, chemical, or highly corrosive environments, zinc-plated steel may require additional evaluation. Stainless steel, hot-dip galvanized products, or other corrosion-resistant options may be more suitable depending on the exposure and project specification. I do not treat a zinc-plated finish as automatically suitable for every outdoor or aggressive environment.
Two hole straps are available in different conduit sizes and forming profiles. For example, a project may use 20 mm EMT in one area and 25 mm EMT in another, so the strap must be matched to the actual conduit outside diameter rather than selected only by a general product name. The two holes may also differ in spacing, diameter, or shape, which affects the compatible fastener and installation surface.
I begin by recording the conduit size and measuring the actual outside diameter when the project specification is unclear. Nominal trade size and measured outside diameter are not always interchangeable, especially when different regional standards are involved. A supplier should confirm the applicable dimensional standard before production or shipment.
The strap should support the conduit without creating excessive deformation or unnecessary looseness. I compare the inside forming radius, overall width, material thickness, and edge condition against the conduit being used. A poor fit can make alignment difficult and may create avoidable movement or pressure on the tubing.
I verify hole diameter, center-to-center spacing, and the distance from the strap edge to each hole. These details determine whether the strap will align with the intended anchor points. If the project uses concrete, masonry, steel, wood, or a prefabricated support channel, the mounting pattern should be reviewed before bulk purchasing.
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For a dry indoor installation, zinc-plated steel may be a practical option when it meets the project specification. For outdoor or corrosive locations, I ask for coating details and request confirmation that the finish is appropriate for the exposure. I also check whether mixed metals could create a compatibility concern at the fastening point.
The strap itself is only one part of the support assembly. I select fasteners based on the substrate, expected load, installation method, and applicable code requirements. The fastener head must seat properly in the strap hole, and the installer should avoid over-tightening because excessive force can distort the strap or conduit.
I first mark the conduit route and identify a solid mounting surface. The surface should be clean enough for accurate marking, and the installer should check for hidden services before drilling or driving fasteners. The support locations should follow the project drawings and applicable code rather than relying on appearance alone.
I place the strap around the EMT and align both holes with the prepared mounting points. The conduit should sit naturally in the formed section without being forced into position. If the holes do not align, I correct the layout or select a suitable support method instead of bending the strap in the field.
I install both fasteners using a method suitable for the substrate. Tightening should secure the strap firmly while preserving the conduit shape and the integrity of the coating. Unless the product or project documentation specifies a torque value, I avoid inventing one and follow the fastener manufacturer’s instructions and the responsible engineer’s requirements.
After installation, I check that the EMT is stable, the strap is not twisted, and both fasteners are seated correctly. I look for sharp edges, coating damage, excessive gaps, and visible deformation. A final inspection should also confirm that the conduit route, support spacing, and bonding or grounding provisions meet the applicable project requirements.
| Selection item | What I confirm | Why it matters |
|---|---|---|
| Conduit size | Nominal size and actual outside diameter in mm | Determines strap fit and stability |
| Mounting holes | Hole diameter and center spacing in mm | Ensures alignment with fasteners and substrate |
| Material and finish | Steel grade, zinc-plating details, and surface condition | Supports mechanical and corrosion-related evaluation |
| Order requirements | Quantity, packaging, labeling, and target delivery date | Reduces purchasing and installation delays |
Price is influenced by material thickness, forming complexity, coating requirements, tooling, packaging, order volume, and inspection needs. I request a quotation that separates the product price from tooling, packaging, shipping, and any sample or development charges. This makes supplier comparisons more useful than comparing a single unit price.
For a standard item, I ask whether the supplier has existing tooling and what minimum order quantity applies. For a customized item, I provide a drawing or sample and request confirmation of mold ownership, revision control, and approval procedures. I also ask for a realistic lead-time estimate in calendar days, with sample approval and shipping treated separately when applicable.
At SIOSAN, I approach zinc-plated EMT two hole strap sourcing as a specification-matching process rather than a simple catalog purchase. I can help organize the required information around conduit size, material, coating, hole pattern, quantity, packaging, and destination. When a standard product is not sufficient, I can review drawings or samples so the manufacturing discussion starts with measurable requirements.
For an efficient quotation, I recommend sending the conduit size, required dimensions in mm, finish preference, estimated order quantity, packaging needs, and target delivery schedule. If you have a project drawing, product sample, or inspection checklist, include it with the inquiry. This allows our team to clarify what can be supplied, what requires confirmation, and which details should be approved before production.
The right zinc-plated EMT two hole strap is the one that matches the conduit dimensions, mounting pattern, environment, fasteners, and project requirements. I recommend beginning with a complete specification sheet, verifying samples or drawings where necessary, and confirming installation conditions before approving a bulk order. This approach reduces the risk of poor fit, coating mismatch, delayed installation, and avoidable rework.
To request support from SIOSAN, prepare your conduit size, required dimensions, finish, quantity, packaging instructions, and delivery target. Our team can then review the requirement and provide a practical quotation path for standard or customized EMT support components. Contact us with the details of your application so we can help evaluate the most suitable zinc-plated EMT two hole strap for your project.
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