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What is a Clevis Hanger
What Is a Clevis Hanger? A Complete Guide for HVAC and Piping Professionals
A clevis hanger is a pipe support component that suspends a horizontal pipeline from a threaded rod anchored to a ceiling, beam, or overhead structural member. It holds the pipe at a set elevation, transfers the combined weight of the pipe and its contents to the building structure above, and, where required, allows for controlled movement caused by thermal expansion. Clevis hangers are manufactured from carbon steel, hot-dip galvanised steel, and stainless steel, and are specified across HVAC systems, fire protection piping, industrial process lines, plumbing networks, and commercial building services. If you are a contractor, MEP consultant, or procurement professional working on a piping project, this guide covers everything you need to know about what a clevis hanger is, how it works, what types exist, and how to select the right one for your application.
What Does a Clevis Hanger Look Like?
A clevis hanger is a relatively compact component. Its most recognisable feature is the U-shaped strap at the bottom, which wraps around the pipe and holds it in position. At the top of the strap, two parallel side plates rise and are pierced by a clevis pin and bolt that closes the assembly around the pipe. Above the side plates, a threaded eye or rod-receiving hole allows the threaded hanger rod to pass through and connect the entire assembly to the structure above.
When installed, a clevis hanger looks like a pipe sitting inside a metal cradle, suspended from a vertical threaded rod that disappears into the ceiling above. The rod is anchored at the top to a beam clamp, a concrete insert, or a welded anchor point, depending on the structure.
The visual simplicity of the component is part of what makes it so widely used. There are no complex moving parts in a standard fixed clevis hanger. The design is straightforward, the load path is direct, and the installation process is familiar to any mechanical piping crew.
A clevis hanger is simple in appearance but precise in function, and understanding its geometry helps installers and specifiers select the correct size for each pipe diameter.
How Does a Clevis Hanger Work?
Understanding how a clevis hanger works requires following the load path from the pipe up to the structure.
The pipe rests inside the U-shaped strap at the bottom of the hanger. The strap wraps around the underside and sides of the pipe, with the clevis bolt and pin closing across the top to keep the pipe seated correctly inside the cradle. The combined weight of the pipe, its contents, and any insulation wrapped around it presses down on the strap.
The strap transfers that load upward into the clevis body, the two parallel side plates that form the upper section of the hanger. The clevis body transfers the load into the threaded rod that passes through it, held in place by a hex nut above and below the rod-receiving hole. The threaded rod then carries the entire load vertically up to the anchor point fixed to the structure above.
What Happens When Thermal Expansion Is a Factor
In pipe systems that operate at elevated temperatures, the pipe expands longitudinally as it heats up and contracts as it cools down. In a fixed clevis hanger, the pipe is held in position and cannot move through the support point. If thermal expansion is significant and no provision is made for movement, the stress accumulates at fittings, joints, and equipment connections. Where thermal movement must be accommodated, a roller clevis hanger is specified instead. The roller replaces the fixed strap with a rotating cylinder that allows the pipe to slide longitudinally through the support point as it expands and contracts. The hanger continues to carry the pipe load vertically while allowing horizontal movement in the pipe axis direction. The load path in a clevis hanger is mechanically direct and reliable, which is why the component has remained a standard pipe support specification across generations of building services and industrial piping design.
What Are the Main Parts of a Clevis Hanger?
A standard clevis hanger consists of the following components working together as a single assembly:
The pipe strap or band forms the bottom of the assembly and makes direct contact with the pipe surface. In insulated pipe systems, the hanger is sized to fit over the insulation rather than the bare pipe, so the insulation’s outer diameter is what determines the correct strap size.
The clevis body consists of the two parallel side plates that rise from the strap ends and carry the load upward. These plates are pierced by the clevis pin and bolt at the bottom and by the rod hole at the top.
The clevis pin and bolt close the strap around the pipe and keep the pipe seated inside the hanger during installation and throughout the operational life of the piping system.
The rod connection point at the top of the clevis body receives the threaded hanger rod. A hex nut is threaded onto the rod above and below this connection point to fix the hanger at the correct elevation and prevent vertical movement once the pipe is in position.
The threaded hanger rod is technically a separate component but forms an essential part of the complete support assembly. Rod diameter is selected based on the load carried and the spacing between support points.
Each part of the clevis hanger assembly contributes to the overall load capacity and long-term reliability of the pipe support.
What Types of Clevis Hangers Are There?
Fixed Clevis Hanger
The fixed clevis hanger is the most commonly specified type across commercial HVAC, plumbing, and fire protection installations. It supports the pipe at a permanently set elevation. Once the rod length is set and the lock nuts are tightened, the pipe elevation does not change. This type is appropriate for the vast majority of pipe support applications where the design elevation is confirmed before installation begins.Adjustable Clevis Hanger
An adjustable clevis hanger includes a slotted rod connection or a turnbuckle mechanism that allows the installer to raise or lower the pipe after the hanger is in position. This is useful on large projects where minor elevation corrections across a long pipe run are easier to make after the piping is partially assembled rather than before. The adjustable type carries the same load ratings as the fixed type in equivalent sizes.Roller Clevis Hanger
A roller clevis hanger is specified where thermal expansion in the pipe system requires that the pipe be free to move longitudinally through the support point. The roller sits beneath the pipe and rotates as the pipe moves, allowing controlled sliding movement without removing the vertical support the hanger provides. Steam lines, high-temperature hot water heating mains, and industrial process pipes are the most common applications for roller clevis hangers.Swivel and Offset Clevis Hangers
A swivel clevis hanger allows the rod attachment point to rotate slightly relative to the hanger body, which is useful when the rod cannot be installed perfectly vertical due to beam geometry or ceiling obstructions. An offset clevis hanger repositions the pipe laterally from the rod centerline, creating a horizontal offset between the rod and the pipe. Both types solve specific installation geometry problems that arise in congested ceiling spaces. Knowing which clevis hanger type to specify for each situation is what separates a pipe support system that performs reliably from one that causes installation problems or requires early maintenance.
What Materials Are Clevis Hangers Made From?
Carbon Steel
Carbon steel is the standard material for clevis hangers in commercial and light industrial applications. It provides the structural strength required for standard pipe loads in HVAC, plumbing, and fire protection systems at a practical manufacturing cost. Carbon steel clevis hangers used alongside other support components, such as strut clamps form a complete and cost-effective pipe support system for most commercial building installations.Hot-Dip Galvanised Steel
Hot-dip galvanising applies a thick zinc coating to the steel surface through a metallurgical bonding process, producing a finish that is significantly more durable than electro-galvanising in wet or humid environments. Hot-dip galvanised clevis hangers are specified for outdoor mechanical areas, rooftop pipe runs, cooling tower piping, and industrial facilities where moisture exposure would shorten the life of a standard carbon steel component.Stainless Steel
Stainless steel clevis hangers are specified for corrosive environments. Grade SS 304 covers general corrosive conditions in food processing, pharmaceutical, and brewery installations. Grade SS 316 adds molybdenum to improve resistance to chloride corrosion, making it the correct choice for coastal buildings, marine facilities, desalination plants, and chemical handling environments. Stainless steel clevis hangers are often used in conjunction with iron channel framing components in industrial settings where the entire support structure must meet the same corrosion resistance standard. Material selection is not a secondary decision. It directly determines how long the clevis hanger performs in its installation environment without requiring inspection, maintenance, or replacement.
Where Are Clevis Hangers Used?
HVAC Systems
Clevis hangers are a standard component in every HVAC piping installation. Chilled water pipes, condenser water lines, hot water heating mains, and refrigerant pipes all require overhead rod support at intervals determined by the pipe size and material. In a large commercial building, the total hanger count across all HVAC pipe services can reach several hundred individual support points, which is why consistent component quality and reliable supply are important factors in manufacturer selection.Fire Protection Systems
Sprinkler and fire suppression systems specify pipe support at intervals set by the applicable fire protection standard. Clevis hangers are among the most frequently used support types for horizontal branch lines and main distribution pipes in fire protection installations. The hanger must be correctly sized for the pipe and must be made from a material that is compatible with the installation environment, including wet-pipe and dry-pipe system requirements.Industrial Process Piping
In manufacturing plants, refineries, and processing facilities, clevis hangers carry heavier loads and operate in more demanding conditions than in commercial buildings. Material documentation, including mill certificates, is standard practice for industrial procurement, and the hanger specification is typically reviewed by the project’s mechanical or structural engineer before procurement begins.Infrastructure Projects
Hospitals, airports, metro rail stations, and water treatment facilities use clevis hangers as part of large-scale mechanical services installations. These projects require full compliance documentation with every supply, including material test certificates and dimensional inspection reports.Renewable Energy Installations
Solar thermal and photovoltaic installations require coolant pipe and conduit routing across the panel mounting structure. Clevis hangers work alongside cantilever arms to support pipe and conduit runs at the correct elevation across the array, keeping services secure and separated from the structural components of the solar structure framing system. Clevis hangers appear in virtually every sector where horizontal pipelines are installed overhead, which reflects how fundamental this component is to the design and construction of piping systems.
How Do You Select the Right Clevis Hanger?
Selecting the correct clevis hanger for a project requires four pieces of information.
First, the pipe size. The hanger must be sized for the nominal pipe size or the actual outer diameter of the pipe, including the insulation thickness if the pipe is insulated.
Second, the hanger type. Fixed for standard installations. Adjustable, with post-installation elevation correction as needed. Roller where thermal expansion requires longitudinal movement at the support point.
Third, the material and finish. Carbon steel electro-galvanised for dry indoor environments. Hot-dip galvanised for wet or humid conditions. Stainless steel SS 304 or SS 316 for corrosive environments, with SS 316 selected where chloride exposure is a factor.
Fourth, the load requirement. The hanger must be rated for the combined weight of the pipe, its contents at maximum operating conditions, and any insulation. Support spacing determines how much load each hanger carries.
Getting these four decisions right at the specification stage ensures the pipe support system performs throughout the installation’s full design life without unplanned maintenance or premature component replacement.
Frequently Asked Questions
Q1: What is the difference between a clevis hanger and a pipe clamp?
A clevis hanger suspends a pipe from an overhead threaded rod, supporting it from above. A pipe clamp secures a pipe to a surface such as a wall, floor, or strut channel, supporting it from the side or below. Both are pipe support components, but they are used in different installation geometries. Clevis hangers are used for overhead rod suspension. Pipe clamps are used where the pipe runs close to a structural surface.
Q2: What pipe sizes do clevis hangers cover?
Standard clevis hangers are manufactured for nominal pipe sizes from half an inch to 12 inches NPS. Larger diameters and non-standard outer diameters can be manufactured to a buyer-supplied dimensional drawing. Buyers should always confirm the actual outer diameter and whether the hanger must fit over insulation when specifying the size.
Q3: When should a roller clevis hanger be specified instead of a fixed type?
A roller clevis hanger should be specified where the pipe system operates at elevated temperatures and thermal expansion will cause the pipe to move longitudinally during operation. Steam lines, high-temperature hot water heating pipes, and industrial process lines are the most common applications. The mechanical engineer determines which support points require roller types based on thermal expansion calculations for the specific pipe system.
Q4: Can clevis hangers be used for insulated pipes?
Yes. When a pipe is thermally insulated, the clevis hanger is sized to fit over the outer surface of the insulation rather than the bare pipe. The insulation outer diameter determines the correct hanger size in this case, not the nominal pipe size. Buyers should confirm insulation thickness when ordering hangers for insulated pipe systems.
Q5: What documentation should accompany clevis hangers on a project?
For commercial projects, dimensional drawings and material specifications are typically sufficient. For industrial, infrastructure, and government projects, material test certificates, mill certificates, and dimensional inspection reports are routinely required. Export orders are accompanied by a commercial invoice, packing list, and certificate of origin as standard, with additional technical documentation available on request.
