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NSN 5305-01-587-7156

High Torque Screw

About this product

Between 1.916 inches and 1.946 inches fastener length, pan no. 2 head style, between 0.477 inches and 0.492 inches head diameter, head height: between 0.140 inches and 0.150 inches .

Manufacturer part number NAS1578A4T18 for national stock number 5305015877156.

Datasheet

  • Product description

    Close Tolerance Screw NSN 5305-01-587-7156.

  • MPN or Model

    NAS1578A4T18

  • 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
    0.403 inches
  • Fastener Length
    Between 1.916 inches and 1.946 inches
  • Head Style
    Pan no. 2
  • Head Diameter
    Between 0.477 inches and 0.492 inches
  • Head Height
    Between 0.140 inches and 0.150 inches
  • Grip Diameter
    Between 0.248 inches and 0.249 inches
  • Internal Drive Style
    Offset cruciform (torque set)
  • Thread Diameter
    0.250 inches
  • Grip Length
    1.528 inches
  • Thready Qty Per Inch (tpi)
    28
  • Material
    Steel comp 4140 or steel comp 4340
  • Material Specification
    Mil-a-5626 military specification 1st material response or ams 6415 e4340 assn standard 2nd material response
  • Surface Treatment
    Cadmium
  • 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 5305015877156

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Manufacturer Part Numbers and Alternates
MPN manufacturer part number Registrant or Supplier
NAS1578A4T18 National Aerospace Standards
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