UNC THREAD

UNC THREAD

UNC (Unified National Coarse) threads are the most common American imperial thread standard for general-purpose fasteners. Known for their robust, deep thread form, UNC threads provide strong, durable connections that are less prone to cross-threading and are easy to assemble and disassemble. 

Key Characteristics

  • Thread Angle: UNC threads use a 60° symmetrical V-profile flank angle, the same as modern metric ISO threads.
  • Designation: They are designated by their nominal major diameter (in inches) and the number of Threads Per Inch (TPI). For example, a 1/4"-20 UNC thread has a 1/4-inch diameter and 20 threads per inch.
  • Pitch: They have a larger pitch (fewer threads per inch) compared to the Unified National Fine (UNF) series.
  • Tolerances: The coarse pitch allows for greater tolerances in manufacturing and plating processes and makes them more tolerant of slightly dirty or damaged threads.

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Code Description Price Quantity
SSSBHNC025050 1/4UNC X 1/2 ST/ST SOCKET BUTTON SCREW A2/70
45 In Stock for dispatch
£25.00 (exc VAT) per HUND
£30.00 (inc VAT) per HUND
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SSSBHNC025075 1/4UNC X 3/4 ST/ST SOCKET BUTTON SCREW
300 In Stock for dispatch
£35.00 (exc VAT) per HUND
£42.00 (inc VAT) per HUND
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SSSBHNC025100 1/4UNC X 1" ST/ST SOCKET BUTTON SCREW
Out of Stock
£45.00 (exc VAT) per HUND
£54.00 (inc VAT) per HUND
-
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SSSBHNC031100 5/16UNC X 1"SOCKET BUTTON SCREW A2/70
Out of Stock
£96.00 (exc VAT) per HUND
£115.20 (inc VAT) per HUND
-
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SSSBHNC031125 5/16UNC X 1.1/4 SOCKET BUTTON SCREW A2/70
Out of Stock
£96.00 (exc VAT) per HUND
£115.20 (inc VAT) per HUND
-
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SSSBHNC037050 3/8UNC X 1/2 ST/ST SOCKET BUTTON SCREW A2/70
Out of Stock
£226.60 (exc VAT) per HUND
£271.92 (inc VAT) per HUND
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SSSBHNC037075 3/8UNC X 3/4 ST/ST SOCKET BUTTON SCREW A2/70
16 In Stock for dispatch
£92.60 (exc VAT) per HUND
£111.12 (inc VAT) per HUND
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SSSBHNC037100 3/8UNC X 1" ST/ST SOCKET BUTTON SCREW
50 In Stock for dispatch
£80.00 (exc VAT) per HUND
£96.00 (inc VAT) per HUND
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SSSBHNC037200 3/8"UNC X 2" A2 SOCKET BUTTON HEAD SCREW
Out of Stock
£180.00 (exc VAT) per HUND
£216.00 (inc VAT) per HUND
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