I recommend selecting a steel EMT two hole strap by the conduit’s nominal trade size, then confirming the actual outside diameter, strap geometry, finish, and fastening method before ordering. The strap should hold the EMT firmly without crushing, distorting, or leaving excessive movement around the conduit. A two hole strap uses two fasteners, which helps distribute the clamping load and maintain alignment on walls, ceilings, framing, and support surfaces. In this guide, I explain the common size relationship, material options, purchasing checks, and a practical installation process for B2B buyers.
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This guide is intended for electrical wholesalers, contractors, panel builders, distributors, project procurement teams, and OEM buyers sourcing steel EMT two hole straps. It is also useful when preparing a bill of materials for commercial, industrial, institutional, or utility-related installations. I focus on selection and installation principles rather than replacing the project’s electrical code, engineering documents, or local inspection requirements.
A steel EMT two hole strap is a conduit support fitting formed to sit around electrical metallic tubing. Its two holes allow the installer to secure the strap to a supporting surface with two screws, bolts, or other approved fasteners. The fitting keeps the conduit positioned while reducing side-to-side movement caused by installation, vibration, or routine service conditions.
The strap is not normally selected by measuring only the length or width of the part. The most important matching factor is the EMT trade size, because the inside profile of the strap must correspond to the conduit outside diameter. I also check the material thickness, edge condition, hole pattern, coating, and compatibility with the installation environment.
The following chart shows common EMT trade sizes and representative outside diameters used for initial product selection. These dimensions are provided as a purchasing reference; buyers should confirm the applicable regional standard, manufacturer drawing, and project specification before placing a large order. A strap marked for 1/2-inch EMT is intended for that nominal conduit size, not for a generic tube with any outside diameter close to 1/2 inch.
| EMT Trade Size | Representative EMT Outside Diameter | Typical Selection Instruction |
|---|---|---|
| 1/2 in | Approximately 0.706 in | Use a strap specifically marked for 1/2-inch EMT |
| 3/4 in | Approximately 0.922 in | Use a strap specifically marked for 3/4-inch EMT |
| 1 in | Approximately 1.163 in | Confirm the strap profile and hole spacing |
| 1-1/4 in | Approximately 1.510 in | Check forming accuracy and fastening clearance |
| 1-1/2 in | Approximately 1.740 in | Confirm the product drawing before bulk purchase |
| 2 in | Approximately 2.197 in | Match the strap to 2-inch EMT, not rigid conduit |
| 2-1/2 in | Approximately 2.875 in | Review support spacing and anchor requirements |
| 3 in | Approximately 3.500 in | Confirm load and installation conditions |
| 3-1/2 in | Approximately 4.000 in | Use only a correctly matched large-size strap |
| 4 in | Approximately 4.500 in | Request dimensional confirmation for project approval |
Nominal size and actual outside diameter are different measurements, which is why mixing EMT straps with fittings for rigid conduit, IMC, or other tubing can produce a poor fit. The two fastening holes also need enough clearance for the selected anchor and installation tool. For repeat orders, I recommend approving a dimensional drawing that shows the inner width, overall length, hole diameter, center-to-center spacing, and material thickness.
Steel is commonly selected when the project requires a rigid, formed support with controlled geometry and economical sourcing. A zinc-plated or similar protective finish may improve resistance to ordinary indoor handling and atmospheric exposure, but the appropriate finish depends on humidity, chemicals, salt, temperature, and maintenance conditions. I do not recommend treating a general-purpose finish as automatically suitable for corrosive or outdoor environments.
Stainless steel may be considered for wet areas, washdown zones, food-processing surroundings, coastal locations, or applications where corrosion resistance is a stronger priority. The exact stainless grade and surface condition should be specified rather than assumed. Buyers should also consider galvanic interaction between the strap, conduit, fastener, and mounting substrate.
Regardless of the steel grade, the formed radius should support the conduit without sharp contact points. Clean holes and deburred edges reduce the risk of installation injuries and interference with fasteners. For volume procurement, I suggest requesting samples from the intended production lot or defining an inspection standard for burrs, cracks, coating coverage, and dimensional consistency.
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First, identify that the tubing is EMT rather than rigid metal conduit, IMC, cable tray, or another raceway type. Record the nominal trade size from the drawing, label, or existing material schedule. If the conduit is already on site, measure its outside diameter and compare that measurement with the applicable standard instead of relying on visual estimation.
The supporting surface determines the fastener type and, in many cases, the practical strap design. Wood, concrete, masonry, steel framing, and sheet metal require different anchoring approaches, and the anchor must be suitable for the expected load and substrate condition. The strap itself should not be used to compensate for a weak or unsuitable mounting surface.
Support spacing must follow the applicable electrical code, engineering specification, and project instructions. I avoid giving one universal spacing value because permitted spacing can depend on conduit size, location, construction method, and jurisdiction. The two-hole design can improve alignment, but it does not remove the need to follow the required support schedule.
For procurement, define the EMT size range, steel grade or finish, hole requirements, packaging unit, inspection expectations, and required documentation. A useful purchase description should state whether the strap is for indoor, outdoor, damp, or corrosive service. For international shipments, I also confirm carton markings, net and gross weight, pallet requirements, and export documentation before production.
I recommend using a calibrated tool or the project’s specified tightening method when torque requirements are provided. Over-tightening can deform thin conduit or damage the strap and substrate, while under-tightening can allow movement. Installation should be performed by qualified personnel in accordance with the project safety procedures.
Pricing for steel EMT two hole straps depends on material, size, coating, tooling, order quantity, packaging, inspection, and shipping terms. Larger sizes generally consume more material, while customized hole spacing or special finishes may require separate tooling or process approval. I recommend comparing the complete landed cost rather than evaluating unit price alone.
MOQ and lead time should be confirmed for each size and finish, especially when an order contains multiple dimensions. A capable supplier should be able to discuss drawings, samples, production capacity, packaging, quality checks, and export coordination without making unsupported performance claims. At SIOSAN, I can support B2B buyers with product selection for Steel EMT Two Hole Strap, dimensional confirmation, finish discussion, sample coordination, and quotation preparation based on the actual project requirement.
The correct Steel EMT Two Hole Strap is the one that matches the EMT trade size, fits the conduit profile, suits the environment, and works with the selected substrate and fasteners. My recommended next step is to prepare a size-and-finish schedule covering every conduit dimension required for the project. Send that schedule to SIOSAN for dimensional review, sample or drawing confirmation, MOQ discussion, and a B2B quotation tailored to your aluminum pipes and EMT conduit fitting supply needs.
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