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NSN 5305-01-520-3841

High Torque Screw

About this product

Between 1.937 inches and 1.984 inches fastener length, flat countersunk head style, between 0.717 inches and 0.760 inches head diameter, grip diameter: between 0.3735 inches and 0.3745 inches .

Manufacturer part number HT181-6-21 for national stock number 5305015203841.

Datasheet

  • Product description

    Close Tolerance Screw NSN 5305-01-520-3841.

  • MPN or Model

    HT181-6-21

  • Schedule B
    7318.15.2000 (Bolts and bolts and their nuts or washers exported in the same shipment)
  • Thread Class
    3a
  • Thread Direction
    Right-hand
  • Thread Length
    0.641 inches
  • Fastener Length
    Between 1.937 inches and 1.984 inches
  • Head Style
    Flat countersunk
  • Head Diameter
    Between 0.717 inches and 0.760 inches
  • Grip Diameter
    Between 0.3735 inches and 0.3745 inches
  • Point Length
    0.060 inches
  • Point Style
    Flat
  • Internal Drive Style
    High-torque
  • Thread Diameter
    0.3750 inches
  • Grip Length
    Between 1.302 inches and 1.322 inches
  • Thready Qty Per Inch (tpi)
    24
  • Min. Tensile Strength (psi)
    15550 pounds per square inch
  • Countersink Angle
    Between 99.0 degrees and 101.0 degrees
  • Surface Finish
    32.0 microinches threads
  • Material
    Steel
  • Material Specification
    Nas98 assn standard single material response
  • Surface Treatment
    Cadmium
  • Surface Treatment Specification
    Nas672 federal standard single treatment response
  • Thread Series Designator
    Unjf
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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 5305015203841

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Manufacturer Part Numbers and Alternates
MPN manufacturer part number Registrant or Supplier
HT181-6-21 Hi-shear Corporation
HT181-6-21 Lisi Aerospace Canada Corp
HT618-6-21 Hi-shear Corporation
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