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NSN 5305-00-471-6646

High Torque Screw

About this product

0.640 inches fastener length, flat countersunk head style, between 0.452 inches and 0.510 inches head diameter, grip diameter: between 0.2495 inches and 0.2504 inches .

Manufacturer part number STD2180E40 for national stock number 5305004716646.

Datasheet

  • Product description

    Close Tolerance Screw NSN 5305-00-471-6646.

  • MPN or Model

    STD2180E40

  • Schedule B
    8109.90.0000 (Zirconium and articles thereof nesoi)
  • NMF (National Motor Freight)
    093486 - Bolts, Nuts Or Screws, NOI (sub 3)
  • Thread Class
    3a
  • Thread Direction
    Right-hand
  • Thread Length
    0.240 inches
  • Fastener Length
    0.640 inches
  • Head Style
    Flat countersunk
  • Head Diameter
    Between 0.452 inches and 0.510 inches
  • Grip Diameter
    Between 0.2495 inches and 0.2504 inches
  • Internal Drive Style
    High-torque
  • Thread Diameter
    0.250 inches
  • Grip Length
    0.400 inches
  • Thready Qty Per Inch (tpi)
    28
  • Countersink Angle
    Between 99.0 degrees and 101.0 degrees
  • Material
    Titanium alloy
  • Surface Treatment
    Cadmium
  • Surface Treatment Specification
    Std.2167 cagec k0289 mfr ref single treatment response
  • Thread Series Designator
    Unf
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Close Tolerance Screw

A screw, machine or screw, cap, socket head whose unthreaded portion is of specified grip length, plated or unplated, and is machined to a tolerance of one thousandth (0.001 in.) (0.025 mm) or less of a specific diameter for items (1.000 in.) (25 mm) or less in diameter. Items over (1.000 in.) (25 mm) in diameter shall have a tolerance of fifteen ten thousandths (0.0015 in.) (0.038 mm) or less. The nominal major diameter of the threads shall be at least one thousandth (0.001 in.) (0.025 mm) below the minimum shank diameter, but not below the minimum major diameter for applicable class of fit, as shown in the screw thread standards, fed std h28 and/or other nationally recognized standards. The head is designed to be held or driven with an inserted driver. It is not designed for rotation by the thumb and fingers. A locking feature may be incorporated in the design of the head or threads.

Mechanic Bill explains High Torque Screw

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NSN 5305004716646

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Manufacturer Part Numbers and Alternates
MPN manufacturer part number Registrant or Supplier
STD2180E40 Bae Systems (operations) Ltd
STD2180E40 British Aerospace Military
99-6038825 Nato Stock Number Assigned
STD2180E40 Bae Systems (operations) Ltd
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