UNC Bolts & Screws

UNC (Unified Coarse) Bolts & Screws

Unified threaded fasteners were phased in on BSA, Norton, and Triumph motorcycles produced in the late 1960's and onwards. Most screws and bolts that threaded directly into alloy castings changed to UNC (Unified Coarse) threads for better holding power without fear of stripping in the softer material.

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  • 14-7018 Screw
    14-7018 Screw
    Diameter ⌀: 5/16 inch
    Length UH: 3/4 inch
    Thread Form: UNC 18tpi
    Head Style: Allen Cap
    Finish: Plated
    NZ$ 1.15
    NZ$ 1.05
  • 14-7020 Screw
    14-7020 Screw
    Diameter ⌀: 5/16 inch
    Length UH: 1 inch
    Thread Form: UNC 18tpi
    Head Style: Allen Cap
    Finish: Plated
    NZ$ 1.15
    NZ$ 1.05
  • 14-7023 Bolt
    14-7023 Bolt
    Diameter ⌀: 5/16 inch
    Length UH: 1&3/4 inch
    Thread Form: UNC 18tpi
    Head Style: Allen Cap
    Finish: Plated
    NZ$ 1.35
    NZ$ 1.20
  • 14-7024 Screw
    14-7024 Screw
    Diameter ⌀: 5/16 inch
    Length UH: 2 inch
    Thread Form: UNC 18tpi
    Head Style: Allen Cap
    Finish: Plated
    NZ$ 1.15
    NZ$ 1.05
  • 14-7026 Screw
    14-7026 Screw
    Diameter ⌀: 5/16 inch
    Length UH: 2&3/8 inch
    Thread Form: UNC 18tpi
    Head Style: Allen Cap
    Finish: Plated
    NZ$ 1.15
    NZ$ 1.05
  • 14-7101 Screw
    14-7101 Screw
    Diameter ⌀: 5/16 inch
    Length UH: 3&1/4 inch
    Thread Form: UNC 18tpi
    Head Style: Allen Cap
    Finish: Plated
    NZ$ 3.20
    NZ$ 2.90
  • 14-7804 Screw
    14-7804 Screw
    Diameter ⌀: 1/4 inch
    Length UH: 1/2 inch
    Thread Form: UNC 20tpi
    Head Style: Pan Pozidriv
    Finish: Plated
    NZ$ 1.15
    NZ$ 1.05
  • 14-7805 Screw
    14-7805 Screw
    Diameter ⌀: 1/4 inch
    Length UH: 5/8 inch
    Thread Form: UNC 20tpi
    Head Style: Pan Pozidriv
    Finish: Plated
    NZ$ 1.15
    NZ$ 1.05
  • 14-7806 Screw
    14-7806 Screw
    Diameter ⌀: 1/4 inch
    Length UH: 3/4 inch
    Thread Form: UNC 20tpi
    Head Style: Pan Pozidriv
    Finish: Plated
    NZ$ 1.15
    NZ$ 1.05
  • 21-0536 Drain Plug
    21-0536 Drain Plug
    Chaincase Drain Plug
    Triples
    Diameter ⌀: 3/8 inch
    Length UH: 3/8 inch
    Thread Form: UNC 16tpi
    Hex Size: 9/16 inch AF
    aka: S536
    NZ$ 2.40
    NZ$ 2.15
  • 21-0678
    21-0678
    SCREW,ALLN,5/16X18X4
    NZ$ 13.40
    NZ$ 12.10
  • 21-1815 Screw
    21-1815 Screw
    Gearbox Cover Screw
    Triumph T150 T160 Trident
    Diameter ⌀: 1/4 inch
    Length UH: 4&1/4 inch
    Thread Form: UNC 20tpi
    Head Style: Pan Head Posidriv
    Finish: Plated
    NZ$ 1.60
    NZ$ 1.45
  • 21-1819 Bolt
    21-1819 Bolt
    Crankcase Bolt
    Diameter ⌀: 5/16 inch
    Length UH: 4&1/4 inch
    Thread Form: UNC 18tpi
    Hex Size: 1/2 inch AF
    Finish: Plated
    NZ$ 13.00
    NZ$ 11.70
  • 21-1820 Bolt
    21-1820 Bolt
    Crankcase Bolt
    Diameter ⌀: 5/16 inch
    Length UH: 4&1/2 inch
    Thread Form: UNC 18tpi
    Hex Size: 1/2 inch AF
    Finish: Plated
    NZ$ 5.80
    NZ$ 5.25
  • 21-1860 Screw
    21-1860 Screw
    Gearbox Cover Screw
    BSA A75 Rocket 3
    Diameter ⌀: 1/4 inch
    Length UH: 5&3/4 inch
    Thread Form: UNC 20tpi
    Head Style: Pan Head Posidriv
    Finish: Plated
    NZ$ 8.05
    NZ$ 7.25
  • 21-1869 Bolt
    21-1869 Bolt
    Crankcase Bolt
    Diameter ⌀: 5/16 inch
    Length UH: 2&1/2 inch
    Thread Form: UNC 18tpi
    Hex Size: 1/2 inch AF
    Finish: Plated
    NZ$ 3.20
    NZ$ 2.90
  • 21-1870 Bolt
    21-1870 Bolt
    Crankcase Bolt
    Diameter ⌀: 5/16 inch
    Length UH: 1&7/8 inch
    Thread Form: UNC 18tpi
    Hex Size: 1/2 inch AF
    Finish: Plated
    NZ$ 1.05
    NZ$ 0.95
  • 21-1871 Plug
    21-1871 Plug
    Tacho Drive Plug
    Left Hand Thread
    NZ$ 8.60
    NZ$ 7.75
  • 21-1872 Plug
    21-1872 Plug
    Drain Plug
    Sump & Timing
    NZ$ 8.60
    NZ$ 7.75
  • 21-1873 Screw
    21-1873 Screw
    CRANKCASE Mouth Screw
    Diameter ⌀: 1/4 inch
    Length UH: 13/16 inch
    Thread Form: UNC 20tpi
    Head Style: Slotted Button
    NZ$ 6.15
    NZ$ 5.50
  • 21-1875 Bolt
    21-1875 Bolt
    Rocker Box Bolt
    Diameter ⌀: 1/4 inch
    Length UH: 2&1/4 inch
    Thread Form: UNC 20tpi
    Hex Size: 7/16 inch AF
    Finish: Plated
    NZ$ 1.35
    NZ$ 1.20
  • 21-1878 Screw
    21-1878 Screw
    Chaincase Screw
    Diameter ⌀: 1/4 inch
    Length UH: 2&3/4 inch
    Thread Form: UNC 20tpi
    Head Style: Fillister Posidriv
    Finish: Plated
    NZ$ 6.80
    NZ$ 6.15
  • 21-1879 Screw
    21-1879 Screw
    Countersunk Screw
    Clutch Thrust Plate
    Diameter ⌀: 1/4 inch
    Length OA: 7/16 inch
    Thread Form: UNC 20tpi
    Head Style: Slotted Countersunk
    NZ$ 1.05
    NZ$ 0.95
  • 21-1892 Bolt
    21-1892 Bolt
    Crankcase Bolt
    Unit Construction
    Triumph BSA Singles
    Diameter ⌀: 5/16 inch
    Length UH: 1&1/2 inch
    Thread Form: UNC 18tpi
    Hex Size: 7/16 inch AF
    Finish: Plated
    NZ$ 3.20
    NZ$ 2.90
  • 21-1898 Plug
    21-1898 Plug
    Grub Screw Plug
    Triumph BSA Singles
    Diameter ⌀: 3/8 inch
    Length UH: 3/8 inch
    Thread Form: UNC 16tpi
    aka: S1898
    NZ$ 1.05
    NZ$ 0.95
  • 21-1903 Plug
    21-1903 Plug
    Plug Bolt
    Diameter ⌀: 5/16 inch
    Length UH: 3/8 inch
    Thread Form: UNC 18tpi
    Hex Size: 7/16 inch AF
    Finish: Plated
    NZ$ 1.05
    NZ$ 0.95
  • 21-1907 Bolt
    21-1907 Bolt
    Diameter ⌀: 5/16 inch
    Length UH: 1&1/8 inch
    Thread Form: UNC 18tpi
    Hex Size: 7/16 inch AF
    Finish: Plated
    NZ$ 1.05
    NZ$ 0.95
  • 21-1916 Screw
    21-1916 Screw
    Diameter ⌀: 1/4 inch
    Length UH: 1&1/4 inch
    Thread Form: UNC 20tpi
    Head Style: Fillister Posidriv
    Finish: Plated
    NZ$ 1.60
    NZ$ 1.45
  • 21-1917 Screw
    21-1917 Screw
    Diameter ⌀: 1/4 inch
    Length UH: 2&5/8 inch
    Thread Form: UNC 20tpi
    Head Style: Fillister Posidriv
    Finish: Plated
    NZ$ 1.05
    NZ$ 0.95
  • 21-1918 Screw
    21-1918 Screw
    Diameter ⌀: 1/4 inch
    Length UH: 2&3/8 inch
    Thread Form: UNC 20tpi
    Head Style: Fillister Posidriv
    Finish: Plated
    NZ$ 1.60
    NZ$ 1.45
  • 21-1919 Bolt
    21-1919 Bolt
    Crankcase Bolt
    Diameter ⌀: 5/16 inch
    Length UH: 1&5/8 inch
    Thread Form: UNC 18tpi
    Hex Size: 1/2 inch AF
    Finish: Plated
    NZ$ 4.30
    NZ$ 3.90
  • 21-1920 Set Screw
    21-1920 Set Screw
    Slotted Set Screw
    Diameter ⌀: 1/4 inch
    Length UH: 3/8 inch
    Thread Form: UNC 20tpi
    Hex Size: 7/16 inch AF
    Finish: Plated
    NZ$ 1.60
    NZ$ 1.45
  • 21-1926 Screw
    21-1926 Screw
    Crankcase Mouth Screw
    Diameter ⌀: 1/4 inch
    Length UH: 21/32 inch
    Thread Form: UNC 20tpi
    Head Style: Slotted Button
    Fits: Triumph 500
    aka: S1926
    NZ$ 1.05
    NZ$ 0.95
  • 21-1929 Screw
    21-1929 Screw
    Gearbox Camplate Screw
    Diameter ⌀: 1/4 inch
    Length OA: 3/8 inch
    Thread Form: UNC 20tpi
    Head Style: Countersunk Posidriv
    Fits: Triumph 500
    aka: S1929
    NZ$ 0.55
    NZ$ 0.45
  • 21-1943 Plug
    21-1943 Plug
    Primary Drain Plug
    Diameter ⌀: 5/16 inch
    Length UH: 1/2 inch
    Thread Form: UNC 18tpi
    Hex Size: 1/2 inch AF
    Fits: Triumph BSA Singles
    aka: S1943
    NZ$ 1.05
    NZ$ 0.95
  • 21-1951 Screw
    21-1951 Screw
    Primary Cover Screw
    Diameter ⌀: 1/4 inch
    Length UH: 1&7/8 inch
    Thread Form: UNC 20tpi
    Head Style: Fillister Posidriv
    Finish: Plated
    Fits: Triumph BSA Singles
    aka: S1951
    NZ$ 0.85
    NZ$ 0.80
  • 21-1972 Plug
    21-1972 Plug
    Oil Relief Plug
    Triumph BSA Singles
    Diameter ⌀: 5/8 inch
    Thread Form: UNC 11tpi
    NZ$ 3.20
    NZ$ 2.90
  • 21-1973 Bolt
    21-1973 Bolt
    Oil Union Bolt
    Diameter ⌀: 5/16 inch
    Length UH: 11/16 inch
    Thread Form: UNC 18tpi
    Hex Size: 1/2 inch AF
    Fits: Triumph BSA Singles
    aka: S1973
    NZ$ 1.05
    NZ$ 0.95
  • 21-1998 Taptite Screw
    21-1998 Taptite Screw
    Self Tapping Screw
    Diameter ⌀: 7/64 inch
    Length UH: 13/16 inch
    Thread Form: #4 UNC 40tpi
    Head Style: Pan Pozidriv
    Fits: Triumph Stop Switch
    Brake Plate Gauze
    aka: S1998
    NZ$ 1.45
    NZ$ 1.30
  • 21-2044 Plug
    21-2044 Plug
    Non Return Valve Plug
    Triumph BSA Singles
    Diameter ⌀: 3/8 inch
    Length UH: 3/8 inch
    Thread Form: UNC 16tpi
    aka: S2044
    NZ$ 4.30
    NZ$ 3.90
  • 21-2064 Screw
    21-2064 Screw
    Tank Badge Screw
    Diameter ⌀: 1/16 inch
    Length UH: 3/8 inch
    Thread Form: #8-32 UNC 32tpi
    Head Style: Filister Posidriv
    aka: S2064
    NZ$ 2.00
    NZ$ 1.80
  • 21-2067 Screw
    21-2067 Screw
    Condensor Screw
    Diameter ⌀: 3/16 inch
    Length UH: 13/16 inch
    Thread Form: #10-24 UNC 24tpi
    Head Style: Panhead Posidriv
    NZ$ 3.75
    NZ$ 3.40
  • 21-2111 Drain Plug
    21-2111 Drain Plug
    Gearbox Drain Plug
    Fits: Triumph BSA
    Singles 1971 on
    Diameter ⌀: 1/2 inch
    Thread Form: UNC 13tpi
    aka: S2111
    NZ$ 10.75
    NZ$ 9.65
  • 21-2140 Screw
    21-2140 Screw
    Gearbox Cover Screw
    Diameter ⌀: 1/4 inch
    Length UH: 4&3/8 inch
    Thread Form: UNC 20tpi
    Head Style: Slotted Cheese Head
    Fits: Triumph Triple
    NZ$ 10.05
    NZ$ 9.05
  • 21-2162 Screw
    21-2162 Screw
    Gearbox Cover Screw
    Diameter ⌀: 1/4 inch
    Length UH: 2&7/8 inch
    Thread Form: UNC 20tpi
    Head Style: Fillister Posidriv
    Finish: Plated
    NZ$ 3.15
    NZ$ 2.85
  • 21-2192 Screw
    21-2192 Screw
    Switch Block Screw
    Diameter ⌀: 3/16 inch
    Length UH: 7/8 inch
    Thread Form: #10-24 UNC 24tpi
    Head Style: Fillister Posidriv
    Fits: Triumph
    aka: S2192
    NZ$ 5.25
    NZ$ 4.70
  • 21-2194 Screw
    21-2194 Screw
    Switch Block Screw
    Diameter ⌀: 3/16 inch
    Length UH: 1&7/8 inch
    Thread Form: #10-24 UNC 24tpi
    Head Style: Fillister Posidriv
    Fits: Triumph
    aka: S2194
    NZ$ 2.00
    NZ$ 1.80
  • 21-5842 Bolt
    21-5842 Bolt
    Diameter ⌀: 1/4 inch
    Length UH: 1/2 inch
    Thread Form: UNC 20tpi
    Hex Size: 7/16 inch AF
    Finish: Plated
    NZ$ 0.80
    NZ$ 0.70
  • 68-0344 Bolt
    68-0344 Bolt
    Rocker Spindle Bolt
    Grub Screw
    Diameter ⌀: 1/4 inch
    Length UH: 5/16 inch
    Thread Form: UNC 20tpi
    Hex Size: 7/16 inch AF
    BSA A50 & A65 models
    NZ$ 2.15
    NZ$ 1.90
  • 68-0981 Bolt
    68-0981 Bolt
    Tacho Drive Bolt
    Diameter ⌀: 3/16 inch
    Length UH: 5/8 inch
    Thread Form: #10-24 UNC 24tpi
    BSA A50 & A65 models
    NZ$ 2.15
    NZ$ 1.90

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