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Best Union Tube Nuts

Legris 0110 04 00 Brass Compression Tube Fitting, Nut, For 4 mm Tube OD x M8x1 Thread, 10 mm Hex Siz, 11 mm Length
This Legris 0110 nut compression tube fitting is made of brass, connects to a metric tube, and is suitable for high-temperature, pressure, and vacuum applications. It is made of brass for corrosion resistance, ductility at high temperatures, and low magnetic permeability, and has an operating pressure rating range of 200 to 500 pounds per square inch (psi) at a temperature range of -65 to +250 degrees F. This nut compression tube fitting meets the Restriction of Hazardous Substances Directive (RoHS), adopted by the European Union (EU), and is suitable for use in high-temperature, pressure, and vacuum applications.
Reviews
"5 stars what more to say."
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Uxcell a16050300ux0575 Round Connector Nuts M6x25x10mm Round Rod Stud Threaded Insert Rose Joint Adapter Connectors Nuts 5Pcs
M6 metric round coupling connector nuts, 10mm outside diameter, 25mm height.All connectors are fully threaded internally.Connectors are used to connect two threaded parts together. Thread size: M6/0.24"; product Name: round connector nuts.
Reviews
"These are high-quality cylindrical nuts that are fully threaded internally."
"the holes are not centered in the studs."
"Works well for intended purpose."
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DIAL TV120504 1/4" Compression Nut/Sleeve (2 Pack)
Standard compression sleeve and nut for 1/4" O.D. Enter your model number to make sure this fits.
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Best Flared Tube Nuts

M10 X 1.0 Bubble Flare Nut Euro
[Ford] (50). Enter your model number to make sure this fits.
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Best Adapter Tube Nuts

Uxcell a16050300ux0575 Round Connector Nuts M6x25x10mm Round Rod Stud Threaded Insert Rose Joint Adapter Connectors Nuts 5Pcs
M6 metric round coupling connector nuts, 10mm outside diameter, 25mm height.All connectors are fully threaded internally.Connectors are used to connect two threaded parts together. Thread size: M6/0.24"; product Name: round connector nuts.
Reviews
"These are high-quality cylindrical nuts that are fully threaded internally."
"the holes are not centered in the studs."
"Works well for intended purpose."
Find Best Price at Amazon