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UNS threads are rarely used for bolts, but rather on nuts, tapped holes, and threaded ODs. Because of this UNS taps are readily available. [6] [7] Most UNS threads have more threads per inch than the correlating UNF or UNEF standard; therefore they are often the strongest thread available. [8]
Unified Inch Screw Threads (UN and UNR Thread Form) V Thread Form: 1 ⁄ 4 ″-20 UNC #4-40 UNC ASME B1.5-1997 (R2014) Acme Screw Threads: Trapezoidal Thread Form: Tr 60×9 ANSI/ASME B1.9-1973 (R2017) Buttress Inch Screw Threads: Breech-Lock Thread Form: ASME B1.10M-2004 (R2014) Unified Miniature Screw Threads: V Thread Form: 0.60 UNM ANSI/ASME ...
The major minus pitch technique also works for inch-based threads, but you must first calculate the pitch by converting the fraction of threads-per-inch (TPI) into a decimal. For example, a screw with a pitch of 1/20 in (20 threads per inch) has a pitch of 0.050 in and a 1 ⁄ 13 in pitch (13 threads per inch) has a pitch of 0.077 in.
Unified Fine (UNF), the successor to the obsolete National Fine (NF) thread. Unified Extra Fine (UNEF) Unified Special (UNS) National pipe thread, used in North America for several purposes. National Pipe Taper (NPT) National Pipe Taper Fuel (NPTF), also known as Dryseal, a better sealing version of NPT. National Pipe Taper Railing fittings (NPTR)
UNS: Unified National Special; unified numbering system: Unified National Special is a subset series of the Unified Thread Standard. It is an extensible series, covering various special threads. The unified numbering system is a vaguely named standard for naming alloys by principal element percentages. UON: unless otherwise noted
The Unified Numbering System for Metals and Alloys (UNS) is an alloy designation system widely accepted in North America. Each UNS number relates to a specific metal or alloy and defines its specific chemical composition, or in some cases a specific mechanical or physical property. A UNS number alone does not constitute a full material ...
The coupling has a ⅝-24 UNEF thread. Amphenol suggests tightening to a torque of 15 inch-pounds (1.7 N⋅m), [2] while Andrew Corporation suggest 20 inch-pounds (2.3 N⋅m) for their hex nut variant. As torque limit depends only on thread quality and cleanliness, whereas the main operational requirement is good RF contact without significant ...
UNEF may refer to: United Nations Emergency Force, a UN force deployed in the Middle East in 1956; UNEF, a designation for Extra-Fine thread series of Standard Unified Screw Threads (ANSI B1.1) Union Nationale des Étudiants de France (National Union of Students of France), a French students' union