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The Best Union Tube Nuts

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Discover now our comparison of the best Union Tube Nuts. It is never easy to choose from the wide range of offers. On the market, you will find an incalculable number of models, all at different prices. And as you will discover, the best Union Tube Nuts are not always the ones at the highest prices! Many criteria are used, and they make the richness and relevance of this comparison.
To help you make the best choice among the hundreds of products available, we have decided to offer you a comparison of the Union Tube Nuts in order to find the best quality/price ratio. In this ranking, you will find products listed according to their price, but also their characteristics and the opinions of other customers. Also discover our comparisons by categories. You won’t have to choose your products at random anymore.

No. 2
Frienda 12 Pieces 3/8 Inch-24 Threads Brake Line Fittings Assortment for 3/16 Inch Tube (4 Unions, 8 Nuts)
  • Fit for: the unions measures approx. 0.6 x 0.9 inch, the nut measures approx. 0.67 x 3/8 inch, fit for most common inverted flare or double flare sizes for 3/16 inch tube, for use with 3/16 inch steel, poly coated or copper brake lines; Please confirm the size of the details according to the picture before purchasing
  • Size and material: both the unions and nuts are metric 3/8-24 threads (regular 3/16 inch tube fitting size), all brake line fittings are made of quality brass to prevent rust and plated for corrosion resistance
  • You will get: 12 pieces brake line fittings in the package, include 4 pieces unions and 8 pieces nuts, you can share them with your family and friends, these tubes unions are good fittings
  • Inverted flare union: these unions are a nice option to join 2 (3/16 inch) brake lines together
  • Brake line fitting connect: the nut is called the fitting for 3/16 inch tube, these unions fittings have a hex size of 3/8 inch and the threads are 3/8 inch with a thread pitch of 24
SaleNo. 3
MuHize Brake Line Fittings - Upgraded 15 Pieces 7/16-24 Threads Brake Union Fittings Assortment for 1/4” Brake Line Tube (5 Unions, 10 Nuts)
  • PACKAGE INCLUDE - MuHize upgraded Brake Line Fittings Replacement (Pack of 15): ① 5 x metric 7/16-24 threads unions; ② 10 x metric 7/16-24 threads nuts; Note:Both the unions and nuts is metric 7/16-24 threads (regular 1/4 inch tube fitting size). Please check before shopping!
  • INVERTED FLARE UNION- Any 2 (1/4 inch) brake lines can be easy to joined with Muhize unions. both the sizes for unions and nuts are both 7/16-24 threads, which is the regular fitting size for 1/4 inch tube.
  • HIGHER QUALITY - MuHize brake line fittings are made of durable brass with unique rust corrosion proofing technology.
  • WIDELY APPLICATION - MuHize 7/16-24 threads brake fittings commonly fits for regular inverted flare/ double flare sizes for 1/4 inch brake lines tube.
  • PROFESSIONAL - MuHize focus on outstanding features and benefits of braking line. 100% brand new & made from excellent materials, and good contact.
No. 4
4LIFETIMELINES - Fitting Assortment Kit 1/4" Tube Nut, Union, Adapter; Brake System Line Repair, 8 Popular SKUs, Shatterproof Tackle Box, 16 Tube Nuts, 6 Adapters, 4 Unions
  • Comprehensive Brake Line Fitting Collection: This kit features 8 essential SKUs of 1/4" brake line fittings, a must-have for automotive hydraulic brake system maintenance and repairs.
  • Ideal for Repair Shops: Designed for both specialty and general repair shops, these assortments ensure you have the right brake line fittings readily available when dealing with hydraulic braking systems.
  • Convenient Packaging: Our assortments come in shatter-resistant, see-through plastic trays for easy organization. Locator labels inside the lid simplify the process of finding, selecting, and replenishing brake fittings.
  • Material Compatibility: These fittings are compatible with a range of brake line materials, including steel, copper nickel, copper-coated steel, PVF-coated, and stainless steel brake lines.
  • Lifetime Warranty: Enjoy peace of mind with our lifetime warranty, provided with all products purchased from 4Lifetimelines. Your investment is backed by our commitment to quality.
No. 5
The Stop Shop Inverted Flare Tube Nuts For 5/16 Inch Tube, 1/2"-20 Threads (Pack of 4)
  • Inverted Flare Tube Nuts For 5/16 Inch Tube, 1/2"-20 Threads
  • Pack of 4
  • Plated for corrosion resistance
  • Most common SAE inverted flare sizes for 5/16" O.D. tube
No. 6
MuHize 3/16 Brake Line Fittings - Premium 18 PCS 3/8' - 24 Threads Brake Fittings Assortment for 3/16' Brake Line Tube (6 Unions, 12 Nuts)
  • PACKAGE INCLUDE - MuHize upgraded brake line fittings replacement (pack of 15): ① 6 x 3/8-24 threads unions; ② 12 x 3/8-24 threads nuts. Note:Both the unions and nuts are 3/8-24 threads (regular 3/16 inch tube fitting size) . Please check before shopping!
  • HIGHER QUALITY - MuHize brake line fittings are made of durable brass with unique rust corrosion proofing technology.
  • INVERTED FLARE UNION- Any 2 (3/16 inch) brake lines can be easy to joined with Muhize unions. both the sizes for unions and nuts are both 3/8-24 threads, which is the regular fitting size for 3/16 inch tube.
  • WIDELY APPLICATION - MuHize 3/8' - 24 threads brake fittings commonly fits for regular inverted flare/ double flare sizes for 3/16 inch brake lines tube.
  • PROFESSIONAL - MuHize focus on outstanding features and benefits of braking line. 100% brand new & made from excellent materials, and good contact.
No. 7
A-Team Performance - 12 Piece 3/8 Inch-24 Threads Brake Line Fittings Assortment - for 3/16 Inch Tube (4 Unions, 8 Nuts)
  • 12 Piece 3/8 Inch-24 Threads Brake Line Fittings Assortment - for 3/16 Inch Tube (4 Unions, 8 Nuts)
  • These brake line fittings are made of durable brass to prevent rust and plated for corrosion resistance. Both the unions and nuts is metric 3/8-24 threads (regular 3/16 inch tube fitting size)
  • Intended for most common inverted flare/ double flare sizes for 3/16 inch tube, for use with 3/16 inch steel, poly coated or copper brake lines
  • Compatible with most common inverted flare/ double flare sizes for 3/16 inch tube
  • Package Inclusions - 12 piece brake line fittings in the package, include 4 pieces unions and 8 pieces nuts
SaleNo. 8
2Pieces Copper Pipe Extension Joint Connectors for Air Conditioning Pipe Coupling Adapters with Flare Nuts and Connectors for Copper Tube Diameter 3/8 and 1/4-Inch
  • 【Quick Connection】The AC pipe jointers are designed to connect two copper pipes without welding,without a special welding machine. The connection can be tightened with a wrench, sturdy and durable
  • 【Wide Application】Air conditioning copper pipe extension for joint double connector flare fittings can also be applied in fuel and gas systems, plumbing, refrigeration, and vacuum applications
  • 【SPECIFICATION】Fit for butt copper tube diameter 1/4" (6mm to 7mm) and 3/8" (9mm to 10mm),to replace an older faulty refrigerator compressor,perfect for stretching copper on a mini split
  • 【Package Content】2 sets 100% high quality pure copper solid brass pipe connectors, includes 2 piece of fitting union connector and 4 pieces of flare nuts
No. 9
The Stop Shop Inverted Flare Steel Tube Nuts For 3/8 Inch Tube, 5/8"-18 Threads (Pack of 4)
  • Inverted Flare Steel Tube Nuts For 3/8 Inch Tube, 5/8"-18 Threads
  • Pack of 4
  • Plated for corrosion resistance
  • Most common SAE inverted flare sizes for 3/8" O.D. tube
No. 10
3/16 Brake Line Pressure Fittings, 12 Pieces 3/8 Inch-24 Threads Brass Brake Line Fitting Assortment for 3/16 Inch Brake Line Tube (4 Unions, 8 Nuts)
  • High Quality Material: Brake line fitting is made of high quality brass with anti-rust and anti-corrosion technology, ductile at high temperatures and low magnetic properties. Brake pipe fitting bubbles are strong and reliable for long term use
  • Package and Size: Package contains 12 brake line couplers, including 4 fittings and 8 nuts, the fittings and nuts are 3/8-24 threads (regular 3/16 inch pipe fitting size). Please confirm the size details according to the picture before purchase
  • Inverted and Double Flared Union: Any 2 (3/16-inch) brake lines can be easily connected to brake line adapter fittings for common inverted flare and double flare sizes for 3/16-inch steel, poly-coated or copper brake lines
  • Easy to Install: First clean the surface of the brake pipe, then put nuts on each end of the two brake lines, and finally connect the two nuts with the brake line union connector fitting, and tighten it with a wrench to fix it
  • Widely Compatible: 3/8-24 threaded brake fittings typically fit all common inverted flare/double flare sizes of 7/16-inch brake line tubing. These 7/16-inch brake line unions are great accessories to share with your family and friends

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Last update on 2025-02-10 / Affiliate links / Images from Amazon Product Advertising API