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Created on 09.14
Hose Clamps — A Complete Guide to Types, Installation & Sizing
Hose clamps are known by several names — hose clips, jubilee clips, or even jubilee clamps. "Jubilee" is actually a brand name that has become synonymous with the worm-drive hose clamp style, much like "Kleenex" for tissues. In this guide, we will use the most commonly understood terminology.
What Are Hose Clamps Used For?
Hose clamps are designed to secure a hose over a fitting — such as a spigot, barb, or nozzle — creating a reliable seal that prevents fluid, gas, or chemical leakage at the connection point. Beyond sealing, they also stabilize the hose connection, preventing slippage under pressure or vibration.
Hose clamps are predominantly used in the plumbing and automotive industries, but they are also essential in:
- Chemical processing and transfer systems;
- Pneumatic and hydraulic lines;
- Marine and agricultural equipment;
- Medical and food-grade fluid systems;
- Any application involving the transport of liquids, chemicals, or gases through flexible hoses.
Types of Hose Clamps
There are three primary hose clamp types, each designed for specific applications and performance requirements.
1. Plastic Hose Clamps (Snap Grip / Herbie Grip)
Plastic hose clamps feature interlocking ratcheting teeth that provide a strong, secure hold once engaged. They are installed quickly by hand and can be squeezed with pliers to tighten the grip further. Sometimes referred to as snap grips, snappers, or Herbie grips, these clamps are molded from engineering plastics — with nylon being an excellent choice due to its combination of strength and flexibility, allowing for easier closure without cracking.
Key Characteristics
- Economical — low cost per unit;
- Lightweight — ideal for applications where weight is a concern;
- Reusable — the ratcheting mechanism allows for repeated adjustment;
- Quick installation — no tools required for basic installation.
Applications & Industries
- Specialty vehicle and automotive fuel lines, air lines, and drain lines;
- Pumps and hydraulic systems in medical equipment (note: should not be used in high-pressure hydraulic applications);
- White goods, venting systems, and garden hoses.
2. Worm-Drive Hose Clamps (Jubilee Clips)
Worm-drive hose clamps are the style most commonly associated with the term "jubilee clip." They feature a helical-threaded screw (worm gear) housed in a casing at one end of the band. When the screw is turned — typically with a screwdriver or nut driver — it engages with the slots or teeth in the band, pulling the band tighter around the hose in a worm-like motion.
This mechanism delivers high clamping torque, making worm-drive clamps a heavy-duty solution for demanding applications. They are available in stainless steel and carbon steel (zinc-plated) versions.
Key Characteristics
- High torque — delivers a secure, leak-free seal under pressure;
- Adjustable — the screw mechanism allows for precise diameter adjustment within the clamp's range;
- Compact — ideal for applications where space is restricted or access is difficult;
- Reusable — can be loosened and retightened as needed.
Important: Worm-drive clamps are not recommended for soft or silicone hoses, as the band edges and screw housing can cut or deform the hose material. For small-diameter hose assemblies, consider mini worm-drive clamps designed specifically for tighter spaces.
Applications & Industries
- Wire-reinforced hoses;
- Automotive fuel lines and exhaust hoses;
- Plumbing — sealing hoses, water pipes, and marine sink outlets;
- Signage mounting, temporary repairs, and sealing large containers.
3. T-Bolt Hose Clamps
T-bolt hose clamps are engineered to provide a secure, air-tight seal on applications with larger diameters and in environments where high vibration is present. The clamp's T-bolt is inserted through a slot in the clamp body, and the nut is tightened from underneath using a wrench or pliers. As the nut is tightened, the two halves of the clamp band are drawn together, applying uniform pressure around the hose.
Typically constructed from stainless steel, T-bolt clamps are ideal for high-pressure hose systems and are fully compatible with silicone hoses — making them the preferred choice in performance automotive and industrial applications.
Key Characteristics
- High clamping force — T-bolt mechanism delivers significantly greater torque than worm-drive clamps;
- Air-tight seal — suitable for pressurized gas and fluid systems;
- Vibration resistant — maintains clamp integrity under dynamic loads;
- Compatible with silicone hoses — smooth band interior prevents hose damage.
Applications & Industries
Automotive & Specialty Vehicles:
- Maintain pressure on gas lines when the engine is off;
- Repair gas lines cut too short or add fittings to existing lines;
- Secure bleeder valves or safety valves in gas lines to maintain specific tank pressure.
Water & Fluid Systems:
- Sealing off water lines where hoses and tubing are used;
- Swimming pool plumbing;
- Aquaponics systems;
- Hydroponics systems;
- Drip irrigation systems.
How to Install a Hose Clamp
A torque wrench is the recommended tool for installing a hose clamp, as it allows you to apply the manufacturer's specified torque precisely. A standard screwdriver can also be used for general applications.
Installing a Worm-Drive Hose Clamp
- Loosen the clamp — Turn the screw counterclockwise until the band is open wide enough to slide over the hose;
- Position the clamp on the hose — Slide the clamp onto the end of the hose with the screw head oriented in the direction that allows easy access for your tool;
- Place the hose on the fitting — Push the hose fully onto the barb, spigot, or nozzle, ensuring it is seated to the required depth;
- Position the clamp — Slide the clamp over the hose-to-fitting joint, centering it in the desired location;
- Tighten the clamp — Turn the screw clockwise using a screwdriver or torque wrench until the clamp is securely tightened around the hose;
- Verify torque — Adhere to the clamp manufacturer's specified torque value (typically given in inch-pounds). Do not overtighten — excessive torque will damage the threaded mechanism and may lead to clamp failure.
Installing a T-Bolt Hose Clamp
- Position the clamp — Place the two halves of the clamp around the hose-to-fitting joint;
- Insert the T-bolt — Slide the bolt through the slot in the clamp body;
- Tighten the nut — Using a wrench or pliers, tighten the nut from underneath. The two halves of the clamp will draw together, applying uniform pressure around the hose;
- Verify the seal — Ensure the clamp is evenly tightened and the hose is securely gripped without visible distortion.
How to Remove Hose Clamps
Removing a Worm-Drive or T-Bolt Clamp
- Loosen the fastener — Using a flat-head screwdriver, socket wrench, or appropriate tool, turn the screw or bolt counterclockwise;
- Continue loosening — Turn until the fastener is fully disengaged and the clamp band is loose enough to slide off the hose;
- Remove the clamp — Slide the opened clamp off the hose and fitting.
Note: For spring clamps (also known as constant-tension clamps), use pliers to compress the clamp ears and slide the clamp off the hose. Spring clamps do not have a screw or bolt mechanism.
How to Measure Hose Clamp Size
When we refer to "hose clamp size," we are talking about the clamping diameter range — the minimum and maximum usable diameter that the clamp can accommodate.
Step-by-Step Measurement
- Assemble the hose on the fitting — For an accurate measurement, slide the hose fully onto the fitting you will be using. The hose will expand slightly once fitted, and measuring in the assembled state ensures accuracy;
- Measure the outside diameter (O.D.) — Using a caliper, measure the outside diameter of the hose (with the fitting installed). If you do not have a caliper, you can use the following alternative method:
Alternative formula (when a caliper is not available): Wrap a flexible measuring tape or string around the outside of the hose to measure the circumference, then divide by π (3.14159) to calculate the outside diameter: O.D. = Circumference ÷ π
- Match to clamp range — Ensure your measured O.D. falls within the minimum and maximum clamping range specified for the hose clamp you intend to use.
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