1-321-802-5889

NSN 5305-01-049-1739

High Torque Screw

About this product

Between 0.760 inches and 0.807 inches fastener length, flat countersunk head style, between 0.296 inches and 0.301 inches head diameter, grip diameter: between 0.1885 inches and 0.1895 inches .

Manufacturer part number 51B581-3-8 for national stock number 5305010491739.

Datasheet

  • Product description

    Close Tolerance Screw NSN 5305-01-049-1739.

  • MPN or Model

    51B581-3-8

  • Thread Class
    3a
  • Thread Length
    0.260 inches
  • Fastener Length
    Between 0.760 inches and 0.807 inches
  • Head Style
    Flat countersunk
  • Head Diameter
    Between 0.296 inches and 0.301 inches
  • Grip Diameter
    Between 0.1885 inches and 0.1895 inches
  • Grip Length
    Between 0.490 inches and 0.510 inches
  • Countersink Angle
    100.0 degrees
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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 5305010491739

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Manufacturer Part Numbers and Alternates
MPN manufacturer part number Registrant or Supplier
51B581-3-8 Northrop Grumman Technical Services,
51B581-3-8 Northrop Grumman Systems Corporation
Stock Check
Availability for this item was last checked on 09/05/24. The quantities and conditions available at the time were:
  • NE: 288