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Hose clamps are designed to secure a hose over a fitting, such as a spigot or barb, acting as a seal to prevent fluid from leaking at the connection. They also stabilize the hose connection. They're predominantly used in the plumbing and automotive industries but are also used in other industrial applications and to prevent leaks during the transport of liquids, chemicals and gases.
There are three main hose-clamp types:
The ratcheting teeth interlock to provide a strong, secure. These can be installed quickly by hand and squeezed with pliers to tighten the grip. Sometimes referred to as a snap grip, snapper or herbie grip, these hose clamps are made of plastics. Nylon is an excellent choice, as it's strong while providing flex for easier closure. Economical, lightweight and reusable.
Applications and industries:
These hi-torque worm clamps are the style meant when referring to jubilee clips. They feature a helical-threaded screw, or worm gear, which is housed in the clamp. When the screw is turned, it acts like a worm drive pulling the threads of the band. The band then tightens around the hose or tube.
The high clamping force makes this a heavy-duty jubilee clip. Available as stainless-steel or steel hose clamps, these are ideal when space is restricted or hard to reach. NOT recommended for soft or silicone hose. For small hose assemblies, consider mini worm-drive hose clamps.
Applications and industries:
Designed to provide a secure, air-tight seal on applications with larger diameters, where high vibration occurs. The clamp's bolt is inserted through the hole in the hose clamp body. The nut is then tightened from underneath with a wrench or pliers. As stainless-steel hose clamps, T-bolts are ideal as clamps for high-pressure hose and for use with silicone hoses.
Applications and industries:
Specialty vehicles and automotive
Sealing off water lines when hoses and tubing are used. Examples:
A torque wrench is the best tool for installing a hose clamp, though a screwdriver will work too. We'll use the popular worm-drive hose clamp for our example below. Follow these steps for how to tighten a hose clamp too:
Adhere to the clamp's torque specification, which is given in inches by the clamp manufacturer. Be careful not to overtighten, which will only damage the threaded part of the clamp and lead to the clamp failing.
A t-bolt hose clamp is similarly installed:
The two halves of the clamp are then tightened against each other, and just like that, you're done.
Specifically, let's look at how to remove spring hose clamps, which is another name for t-bolts, which have both a drive and a bolt head.
When we say 'hose-clamp size,' we're referring to the clamping diameter range. This range means the minimum and maximum usable diameter.
Outside Diameter (O.D.) = Circumference (C) ÷ 3. (Pi)
Choose a clamp that sits in the middle of the clamp's adjustment range. Below is a portion of the SAE standard for Type F worm-drive hose clamps. Type F typically has a 1/2" wide band and a 5/16" slotted hex head screw.
Worm-drive hose clamp size chart, Type F
SAE size
Clamp range (inches)
Clamp range (millimeters)
6
3/8 ' 7/8
10 ' 22
8
7/16 ' 1
11 ' 25
10
½ ' 1 1/16
13 ' 27
12
½ ' 1 1/4
13 ' 32
16
13/16 ' 1 ½
21 ' 38
20
13/16 ' 1 3/4
21 ' 44
24
1 ' 2
25 ' 51
28
1 5/16 ' 2 ¼
35 ' 57
32
1 9/16 ' 2 1/2
40 ' 63
36
1 13/16 ' 2 3/4
46 ' 70
40
2 ' 3
51 ' 76
44
2 15/16 ' 3 ¼
59 ' 82
48
2 9/16 ' 3 ½
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65 ' 89
Let's say you have a 1/2" hose. Note the clamp ranges. You can use an SAE size 6 hose clamp. Now let's say your hose is 3/4". Consider using a 12 hose-clamp size. If your hose is 1", a size 16 hose clamp would do. If we're talking about a 2" hose, then you have more choices, as you can see.
The British standard works in a similar way, as this example shows:
British standard for worm-drive hose clips
Size
Adjustment range (millimeters)
Adjustment range (inches)
12
9.5 ' 12
3/8 ' ½
16
11 ' 16
½ ' 5/8
20
13 '20
½ ' ¾
22
16 ' 22
5/8 ' 7/8
25
18 ' 25
¾ ' 1
30
22 ' 30
7/8 ' 1 1/8
35
25 ' 35
1 ' 1 3/8
40
30 ' 40
1 2/8 ' 1 5/8
45
32 ' 45
1 ¼ ' 1 3/4
50
35 ' 50
1 3/8 ' 2
55
40 ' 55
1 5/8 ' 2 1/8
60
45 ' 60
1 ¾ ' 2 3/8
70
55 '70
2 1/8 ' 2 3/4
Figure 1: Worm gear hose clamp design
Hose clamps are mechanical devices designed to secure and fasten hoses onto fittings or connectors. They create a tight and secure seal between the hose and the connected component, preventing leaks or disconnections. Typically made of metal, hose clamps consist of a band or strap that encircles the hose and a tightening mechanism, such as a screw or bolt, to apply pressure and compress the hose onto the fitting. This ensures a firm connection and helps to prevent the hose from slipping off or leaking. Hose clamps are also referred to as jubilee clamps.
Worm gear hose clamps, or screw clamps, are the most widely used type of hose clamp. They consist of a band with slots and a screw connected to these slots (Figure 1). As the screw is tightened, the band tightens around the hose, creating a secure seal. These clamps are easy to use and lower the possibility of damage to soft materials. They are generally used in plumbing and automotive fields.
T-bolt hose clamps have a T-shaped bolt that fits into a slot on the band. As the bolt is tightened, the band tightens around the hose. They provide a powerful and reliable clamping force, often used in applications involving high vibration or large hose diameters like large industrial machinery, heavy trucks, and off-road equipment.
Figure 2: T-bolt design hose clamp
Wire hose clamps, or spring wire clamps, utilize a flexible wire or spring to secure hoses onto fittings. They feature a circular shape formed by overlapping wire ends and are usually made of corrosion-resistant materials like stainless steel.
To use a wire hose clamp, remove the screw and place the wire clamp over the hose. Then, add the screw and tighten it using a screwdriver. Secure the clamp with a nut when it is tight enough. Wire hose clamps are commonly used in high-pressure applications, offering easy installation and removal. However, they may not last as long as other hose clamp types.
Figure 3: Wire hose clamp
To determine the appropriate hose clamp size, measure the diameter of the hose while it is still connected to the fitting. Since most hose clamps can accommodate a range of diameters, choosing a clamp where the hose diameter falls in the middle of its specified range is advisable.
Position a clamp around the hose and fitting, ensuring it covers the connection area. Then, tighten the clamp using a screwdriver or a suitable tool until it securely grips the hose and creates a tight seal.
Yes, use stainless steel hose clamps on PEX (cross-linked polyethylene) tubing. Furthermore, learn how compression fittings can be used on PEX.
Place hose clamps at the ends of the hoses near the fittings or connectors they are securing. This ensures the clamp provides a secure grip on the hose and prevents leaks or disconnections at the critical connection points.
Use a screwdriver or an appropriate tool to turn the screw or bolt on the hose clamp clockwise. Continue tightening until the clamp firmly holds the hose in place and prevents leaks or slippage.
To remove a hose clamp, loosen the screw or bolt by turning it counterclockwise using a screwdriver. Once sufficiently loosened, slide the clamp off the hose and away from the fitting.
Over time, hose clamps may experience some loosening due to factors like vibrations or thermal expansion. Regular inspection and maintenance are important to ensure the clamps remain properly tightened and to prevent potential leaks or failures.
Hose clamps can fail for various reasons, including corrosion, material fatigue, improper installation, excessive pressure or temperature, and aging. It is crucial to select the appropriate clamp type and regularly inspect and replace them as needed to maintain reliable connections.
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