The correct EMT two-hole strap size is normally matched to the conduit’s nominal trade size, such as 1/2 inch, 3/4 inch, 1 inch, or 1-1/4 inch. The strap should hold the EMT firmly without crushing, excessive movement, or interference with couplings and connectors. Because outside dimensions, hole spacing, material thickness, and finish can vary by manufacturer, I recommend confirming the supplier’s dimensional drawing before placing a production order. In this guide, I explain how to select, measure, install, and source EMT two-hole straps for commercial, industrial, and electrical installation projects.
An EMT two-hole strap is a conduit support fitting designed to secure Electrical Metallic Tubing to a wall, ceiling, framing member, panel, or other suitable mounting surface. It wraps around or partially encloses the conduit and uses two mounting holes to distribute the fastening load. Compared with a single-hole strap, the two-hole format can provide a broader attachment footprint and more stable positioning when the installation requires improved resistance to rotation or movement.
The strap does not replace an EMT connector, coupling, grounding method, or expansion solution. Its primary function is mechanical support. The complete installation must still follow the applicable electrical code, project specification, and the requirements of the building structure or equipment manufacturer.
I typically recommend an EMT two-hole strap when the buyer needs consistent conduit alignment and a secure attachment to a fixed surface. It is commonly used in exposed conduit runs, electrical rooms, workshops, commercial buildings, equipment skids, and industrial control installations. The two mounting points are also useful where the conduit may experience vibration, handling, or directional changes near a box or enclosure.
EMT strap sizing is usually identified by the nominal conduit trade size rather than by the strap’s outside width. Common product categories include 1/2 inch, 3/4 inch, 1 inch, 1-1/4 inch, 1-1/2 inch, 2 inch, 2-1/2 inch, 3 inch, and 4 inch EMT sizes. These are nominal sizes, so the actual outside diameter of the EMT is different from the trade-size label. For that reason, a strap should not be selected only by measuring the label on a purchase order.
| Dimension or feature | Why it matters | What I recommend confirming |
|---|---|---|
| Conduit compatibility | Determines whether the strap fits the EMT without looseness or deformation. | Nominal EMT size and actual compatible outside diameter. |
| Overall strap width | Affects load distribution and available clearance around the conduit. | Width, profile, and clearance from adjacent fittings. |
| Hole spacing | Must match the installer’s fastening pattern and the supporting surface. | Center-to-center distance between the two mounting holes. |
| Hole diameter | Controls compatibility with screws, bolts, or other fasteners. | Hole size and acceptable fastener range. |
| Material thickness | Influences stiffness, forming performance, and handling strength. | Thickness tolerance and production standard. |
| Surface finish | Influences corrosion resistance and visual consistency. | Material type, coating, plating, and finish requirements. |
There is no single universal dimension for every EMT two-hole strap. Hole spacing and strap width can change according to the product design, conduit size, fastener system, and intended application. I advise buyers to request a dimensional drawing or a sample for approval whenever the strap must fit an existing bracket, pre-punched rail, enclosure, or automated assembly.
Steel is a practical choice for many general-purpose EMT support applications because it offers a rigid formed structure and is widely compatible with standard electrical installation hardware. A zinc-plated or galvanized finish may be selected for improved resistance to ordinary indoor handling and environmental exposure. The exact corrosion performance depends on the base material, coating process, coating thickness, installation environment, and maintenance conditions.
Aluminum straps may be suitable when low weight, material compatibility, or reduced magnetic response is important. As a supplier serving aluminum pipe and conduit-related industries, I understand that material selection should consider the complete assembly rather than the strap alone. Buyers should evaluate contact between dissimilar metals, moisture exposure, fastener material, and the project’s corrosion-control requirements before approving an aluminum option.
For OEM and project orders, I can work from a buyer’s drawing, sample, dimensional schedule, or application description. Important details include the conduit trade size, material grade, thickness, hole pattern, edge condition, surface finish, packaging, and inspection requirements. If the project has no final drawing, a controlled sample and written approval process can reduce the risk of receiving a strap that is dimensionally close but not interchangeable.
Start with the conduit specification, not the strap currently installed. Confirm whether the project uses 1/2 inch, 3/4 inch, 1 inch, or another EMT trade size. If the conduit is already on site, measure its outside diameter with suitable calipers and compare the result with the supplier’s compatibility information.
Identify whether the strap will be mounted to concrete, masonry, wood, steel framing, aluminum framing, a cable tray support, or an equipment panel. The surface determines the suitable fastener type and may also determine the required hole spacing. A strap that fits the EMT can still be unsuitable if the mounting holes cannot align with the structural support.
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Two-hole straps are commonly installed with two fasteners, but the appropriate fastener depends on the substrate and project specification. Confirm the hole diameter, head clearance, washer requirements, and access for tightening. I do not recommend selecting the screw solely by appearance, because the holding performance depends on the substrate and the complete fastening assembly.
Indoor dry locations, damp areas, outdoor installations, chemical-processing environments, and coastal locations may require different material or finish decisions. Ask for finish details rather than relying on general terms such as “anti-rust” or “weather resistant.” Where corrosion exposure is significant, the strap, fastener, conduit, and supporting structure should be reviewed as one system.
Before installation, verify the strap size, conduit route, support location, and fastener selection. Place the EMT in the strap without forcing it into position or using the strap to correct a damaged or incorrectly routed conduit. Align the two holes with the supporting surface, install the selected fasteners, and tighten them evenly.
Support spacing and fastening requirements can vary by jurisdiction, conduit size, installation orientation, and project code. I therefore recommend using the applicable electrical code and the project engineer’s requirements for final spacing decisions. The strap should provide support, but it should not obstruct expansion provisions, access to fittings, or required bonding and grounding arrangements.
When I evaluate an EMT strap inquiry, I first separate the mandatory dimensions from the preferred features. The mandatory information normally includes conduit size, material, thickness, hole diameter, hole spacing, finish, quantity, and packaging. The buyer should also state whether the product is for one-time construction use, repeated OEM assembly, replacement inventory, or export distribution.
For a supplier comparison, ask for a product drawing, material description, sample approval process, dimensional inspection method, packing details, and realistic production lead time. Requesting a first-article sample is especially useful when the strap will be installed with a jig or combined with aluminum pipes, electrical boxes, or prefabricated modules. Pricing should be evaluated together with tooling, minimum order quantity, packaging, inspection, and delivery terms rather than by unit price alone.
At SIOSAN, I support B2B buyers who need repeatable EMT two-hole strap supply for electrical, construction, industrial, and distribution applications. Our process can begin with a standard size, a customer drawing, a physical sample, or a clear list of required dimensions. We can discuss material selection, forming details, finish, packaging, sampling, and shipment planning based on the actual project requirements.
For a quotation, please prepare the EMT trade size, target material, finish, hole dimensions, estimated order quantity, destination, and any drawing or sample available. If some specifications are not finalized, I can help identify the decisions that must be confirmed before production. This approach helps reduce dimensional mismatch, unnecessary rework, and avoidable sourcing delays.
The correct EMT two-hole strap is selected by matching the nominal conduit size, verifying the actual dimensional fit, confirming hole spacing and fastener compatibility, and choosing a material and finish suitable for the environment. Common EMT categories range from 1/2 inch through 4 inch, but the exact strap dimensions are manufacturer-specific and should be confirmed with a drawing. Installation should be completed with two suitable fasteners, even tightening, and compliance with the applicable project and electrical requirements.
As the next step, create a simple specification sheet containing the conduit size, strap material, overall dimensions, hole pattern, finish, quantity, and packaging requirement. Send that information to SIOSAN for a product review, sample discussion, or quotation. I can then recommend a practical supply route based on your application, approval process, and delivery schedule.
Contact us to discuss your requirements of EMT Two-Hole Strap. Our experienced sales team can help you identify the options that best suit your needs.