Model: HT4020-5-19A

Close Tolerance Screw

Special Features:

O-ring per st7m251, no finish, no lubricant; 40 percent of non-bearing head surface coat with white paint, color 37875 per fed-std-595, removable with solvent

Properties:

Thread Class
3a
Thread Direction
Right-hand
Thread Length
0.531 inches
Fastener Length
Between 1.7025 inches and 1.7495 inches
Head Style
Flat countersunk undercut
Head Diameter
0.575 inches
Head Height
Between 0.0878 inches and 0.0898 inches
Grip Diameter
Between 0.3115 inches and 0.3120 inches
Internal Drive Style
High-torque
End Application
Structural components; f18 aircraft
Thread Diameter
0.3125 inches
Grip Length
Between 1.1775 inches and 1.1975 inches
Features Provided
O ring and cetyl alcohol lubricant
Thready Qty Per Inch (tpi)
24
Countersink Angle
Between 99.0 degrees and 101.0 degrees
Criticality Code Justification
Agav
Part Name Assigned By Controlling Agency
Screw, close tolerance-assembly, 100 degrees countersunk head, dovetail slot, cres
Material
Steel comp xm-13 fastener
Material Specification
Ams5629, ph13-8mo assn standard single material response fastener
Surface Treatment
Passivate fastener
Surface Treatment Specification
Ams-qq-p-35 assn standard single treatment response fastener
Thread Series Designator
Unjf
NSN
5305-01-477-5835
Part Number
HT4020-5-19A
Description
Screw,close Tolerance
CAGE

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 HT4020-5-19A NSN 5305-01-477-5835

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
29294
FIIG:
A003B0
Concept No.:
App. Key:
SS
Cond. Code:
1
Status:
A

Material Classification

Hazardous material, precious metals, criticality, enviroment, and electrostatic discharge indicators
HMIC
PMIC
ESD/EMI
ENAC
MMAC
CRITL
HMIC:
N
PMIC:
A
ESD:
ESD:
MMAC:
CRITL:
Y

Freight Classification

NMFC
UFC
LTL
LCL
WCC
TCC
SHC
ACC
NMFC:
093486
UFC:
48950
LTL:
RATING VARIABLE
LCL:
RATING VARIABLE
WCC:
573
TCC:
Z
SHC:
9
ACC:
Equipment for Aircraft

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Schedule B and Export
  • Schedule B: 7318152000
  • SITC: 69421
  • End Use: Iron and steel products, other
  • NAICS: 332722
  • USDA: 1

Freight Class: Bolts and bolts and their nuts or washers exported in the same shipment

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