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NSN 5305-01-591-0029

High Torque Screw

About this product

Head has a 1.40 degree radius dome..

Manufacturer part number HT4027-4-20 for national stock number 5305015910029.

Datasheet

  • Product description

    Close Tolerance Screw NSN 5305-01-591-0029.

  • MPN or Model

    HT4027-4-20

  • Schedule B
    7508.90.0000 (Other articles of nickel, nesoi (excluding cloth, grill & netting of nickel wire))
  • NMF (National Motor Freight)
    096640 - Screws, Iron Or Steel
  • Thread Class
    3a
  • Thread Direction
    Right-hand
  • Thread Length
    0.469 inches
  • Fastener Length
    Between 1.282 inches and 1.312 inches
  • Head Style
    Fillister countersunk
  • Head Diameter
    Between 0.390 inches and 0.395 inches
  • Head Height
    0.015 inches
  • Grip Diameter
    0.249 mils and 0.250 centimeters
  • Point Length
    0.045 inches
  • Point Style
    Flat
  • Internal Drive Style
    High-torque
  • Thread Diameter
    0.250 inches
  • Grip Length
    1.250 inches
  • Thready Qty Per Inch (tpi)
    28
  • Countersink Angle
    Between 99.0 degrees and 101.0 degrees
  • Point Chamfer Angle
    45.0 of standard range single treatment response
  • Part Name Assigned By Controlling Agency
    Screw-close tolerance, 100 degrees countersunk, reduced head, hi-torque, non-magnetic cres (125 ksi fus)
  • Material
    Nickel alloy 718
  • Material Specification
    Ams 5662 assn standard single material response
  • Surface Treatment
    Passivate
  • Surface Treatment Specification
    Ams 2700 assn 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 5305015910029

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Manufacturer Part Numbers and Alternates
MPN manufacturer part number Registrant or Supplier
HT4027-4-20 Arconic Global Fasteners & Rings,
HT4027-4-20 Sps Technologies, Llc
HT4027-4-20 Huck International, Inc.
ST3M557-4-20 Boeing Company, The
ST3M557-4-20 Valley-todeco, Inc.
ST3M557-4-20 Saturn Fasteners Inc
ST3M557-4-20 Heartland Precision Fasteners, Inc.
ST3M557-4-20 Houston Precision Fasteners I, Lp
HT4027-4-20 Sps Technologies, Llc
ST3M557-4-20 Camcar Llc
HT4027-4-20 Sps Technologies, Llc
11923-4-20 Reid Products Inc.
WC4027-4-20 West Coast Aerospace Inc
HT4027-4-20 Hi-shear Corporation
HT4027-4-20 Sps Technologies, Llc
HT4027-4-20 Alcoa Global Fasteners, Inc.
HT4027-4-20 Lisi Aerospace Canada Corp
ST3M557-4-20 Linread Ltd
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