Metal Lug Caps

At The Cary Company, metal lug caps are a popular twist-off closure designed specifically for sealing glass jars and bottles used in food and beverage applications. These caps feature internal lugs that grip the jar’s threaded finish with a partial turn, making them easy to apply and remove while still delivering a dependable seal. 

Our metal lug caps are commonly equipped with plastisol liners, which create an airtight, hermetic seal when heat is applied. This makes them ideal as lug lids for glass jars, especially for products requiring hot fill, pasteurization, or sterilization. Available in a variety of colors, diameters, and button or non-button styles, our lug caps are widely used for jams, sauces, salsas, pickled goods, and other preserved foods.

The primary difference lies in how the cap engages with the container. Metal lug caps use short internal lugs that lock onto the jar’s threads with a quick twist, typically less than one full rotation. Continuous thread (CT) caps, on the other hand, require multiple turns to fully close.

Because of their quick application and strong seal, metal lug caps are often preferred for high-speed production lines and food preservation. Many of our customers choose lug lids for canning because plastisol-lined lug closures form a vacuum seal during heat processing, while CT caps are more commonly used for dry goods or non-heat applications.

When paired with the correct glass jar finish, our metal lug caps are designed to be leak-resistant. Many styles in our selection include acid-resistant plastisol liners that activate under heat, forming a tight seal that helps protect against leaks, oxygen transfer, and contamination.

Button-style lug caps offer an added advantage by providing a visual indicator of seal integrity. The button depresses under vacuum and pops up once the seal is broken, making these lug lids for canning especially useful for consumer-facing food products.

At The Cary Company, we offer one of the industry’s most dependable selections of metal lug caps, available in multiple sizes, colors, and liner options to fit a wide range of glass jars. Our closures are sold in wholesale and bulk quantities, making it easy to scale your packaging operation while maintaining consistency and quality.

With over 130 years of experience, we support our customers with reliable inventory, knowledgeable product specialists, and compatibility guidance to help you select the right metal lug caps for your application. Whether you need standard gold caps, button lids, or custom sourcing options, The Cary Company is your trusted partner for lug lids, jars, and complete packaging solutions.