Model: HT4027-3D6

Close Tolerance Screw

Special Features:

Head has a 1.40 degrees radius dome

Properties:

Thread Class

Thread Direction

Right-hand

Thread Length

0.406 inches

Fastener Length

Between 0.579 inches and 0.609 inches

Head Style

Fillister countersunk

Head Diameter

Between 0.297 inches and 0.302 inches

Head Height

0.013 inches

Grip Diameter

0.189 mils and 0.190 centimeters

Point Length

0.039 inches

Shank Unthreaded Hole Diameter

0.070 mils first hole and 0.075 centimeters first hole

Point Style

Flat

Internal Drive Style

High-torque

Thread Diameter

0.190 inches

Grip Length

0.188 inches

Thready Qty Per Inch (tpi)

Countersink Angle

Between 99.0 degrees and 101.0 degrees

Distance From Head Largest Bearing Surface To Shank Hole Center

0.473 inches first hole and 0.483 inches first hole

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 (135 ksi fsu)

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

NSN

5305-01-591-0128

Part Number

HT4027-3D6

Description

Screw,close Tolerance

CAGE

06950

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.

Part HT4027-3D6 NSN 5305-01-591-0128

INC

FIIG

Concept No.

App. Key

Cond. Code

Status

INC:

29294

FIIG:

A003B0

Concept No.:

App. Key:

Cond. Code:

Status:

Material Classification

Hazardous material, precious metals, criticality, enviroment, and electrostatic discharge indicators

HMIC

PMIC

ESD/EMI

ENAC

MMAC

CRITL

HMIC:

PMIC:

ESD:

MMAC:

CRITL:

Freight Classification

NMFC

UFC

LTL

LCL

WCC

TCC

SHC

ACC

NMFC:

096640

UFC:

50600

LTL:

70.0

LCL:

WCC:

713

TCC:

SHC:

ACC:

Construction Materials

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Schedule B and Export

Schedule B: 7508900000
SITC: 69975
End Use: Finished metal shapes
NAICS: 332999
USDA: 1

Freight Class: Other articles of nickel, nesoi (excluding cloth, grill & netting of nickel wire)