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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  • 70-0427 Screw
    70-0427 Screw
    Screw
    Diameter ⌀: 1/4 inch
    Length UH: 15/16 inch
    Thread Form: BSW UNC 20tpi
    Head Style: Slotted Cheese
    Finish: Plated
    aka: E427
    NZ$ 2.00
    NZ$ 1.80
  • 70-0573 Screw
    70-0573 Screw
    Screw
    Diameter ⌀: 1/4 inch
    Length UH: 3 inch
    Thread Form: BSW UNC 20tpi
    Head Style: Slotted Cheese
    Finish: Plated
    aka: E573
    NZ$ 4.85
    NZ$ 4.35
  • 70-1049 Screw
    70-1049 Screw
    Case Screw
    Diameter ⌀: 1/4 inch
    Length UH: 1&3/16 inch
    Thread Form: BSW UNC 20tpi
    Head Style: Slotted Cheese
    Finish: Plated
    aka: E1049
    NZ$ 3.50
    NZ$ 3.15
  • 70-1555 Bolt
    70-1555 Bolt
    Crankcase Bolt
    Triumph Pre Unit
    Diameter ⌀: 5/16 inch
    Length UH: 1&5/8 inch
    Thread Form: BSW UNC 18tpi
    aka: E1555
    NZ$ 4.20
    NZ$ 3.80
  • 70-1647 Screw
    70-1647 Screw
    Screw
    Crankcase Mouth
    Triumph Pre Unit
    Diameter ⌀: 1/4 inch
    Length UH: 13/16 inch
    Thread Form: BSW UNC 20tpi
    aka: E1647
    NZ$ 7.90
    NZ$ 7.10
  • 70-2691 Screw
    70-2691 Screw
    Engine Case Screw
    Triumph Pre Unit
    Diameter ⌀: 1/4 inch
    Length UH: 1&9/16 inch
    Thread Form: BSW UNC 20tpi
    Head Style: Slotted Cheese
    Finish: Plated
    aka: E2691
    NZ$ 3.75
    NZ$ 3.40
  • 70-2996 Screw
    70-2996 Screw
    Engine Case Screw
    Triumph Pre Unit
    Diameter ⌀: 1/4 inch
    Length UH: 1&5/8 inch
    Thread Form: BSW UNC 20tpi
    Head Style: Slotted Cheese
    Finish: Plated
    aka: E2996
    NZ$ 4.30
    NZ$ 3.90
  • 70-3436 Screw
    70-3436 Screw
    Case Screw
    Diameter ⌀: 1/4 inch
    Length UH: 1&1/2 inch
    Thread Form: UNC BSW 20tpi
    Head Style: Fillister Posidriv
    Finish: Plated
    NZ$ 1.05
    NZ$ 0.95
  • 70-3440 Screw
    70-3440 Screw
    Diameter ⌀: 1/4 inch
    Length UH: 1&5/8 inch
    Thread Form: UNC 20tpi
    Head Style: Fillister Posidriv
    Finish: Plated
    NZ$ 1.05
    NZ$ 0.95
  • 70-3443 Screw
    70-3443 Screw
    Case Screw
    Diameter ⌀: 1/4 inch
    Length UH: 2&5/16 inch
    Thread Form: UNC 20tpi
    Head Style: Fillister Posidriv
    Finish: Plated
    NZ$ 2.70
    NZ$ 2.45
  • 70-3444
    70-3444
    Case Screw
    Diameter ⌀: 1/4 inch
    Length UH: 2&1/2 inch
    Thread Form: UNC 20tpi
    Head Style: Fillister Posidriv
    Finish: Plated
    NZ$ 2.70
    NZ$ 2.45
  • 70-4052 Bolt
    70-4052 Bolt
    Bolt
    Diameter ⌀: 5/16 inch
    Length UH: 7/8 inch
    Thread Form: BSW UNC 18tpi
    NZ$ 2.70
    NZ$ 2.45
  • 70-4059 Screw
    70-4059 Screw
    Case Screw
    Diameter ⌀: 1/4 inch
    Length UH: 1&19/32 inch
    Thread Form: BSW UNC 20tpi
    Head Style: Fillister Posidriv
    Finish: Plated
    aka: E4059
    NZ$ 2.70
    NZ$ 2.45
  • 70-4490 Screw
    70-4490 Screw
    Case Screw
    Diameter ⌀: 1/4 inch
    Length UH: 11/16 inch
    Thread Form: BSW UNC 20tpi
    Head Style: Fillister Posidriv
    Finish: Plated
    aka: E4490
    NZ$ 2.70
    NZ$ 2.45
  • 70-9330 Plug
    70-9330 Plug
    Oilway Plug
    Diameter ⌀: 5/16 inch
    Length UH: 5/16 inch
    Thread Form: UNC 18tpi
    aka: E9330
    NZ$ 2.70
    NZ$ 2.45

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