Model: HT403A7-20

Close Tolerance Screw

Special Features:

Furnished w/1 preformed packing

Properties:

Thread Class
3a
Thread Direction
Right-hand
Thread Length
Between 0.530 inches and 0.697 inches
Fastener Length
Between 1.890 inches and 1.937 inches
Head Style
Flat countersunk undercut
Head Diameter
Between 0.881 inches and 0.888 inches
Head Height
Between 0.130 inches and 0.133 inches
Grip Diameter
Between 0.4360 inches and 0.4370 inches
Internal Drive Style
High-torque
Thread Diameter
0.438 inches
Grip Length
Between 1.240 inches and 1.260 inches
Thready Qty Per Inch (tpi)
20
Min. Tensile Strength (psi)
180000 pounds per square inch
Hardness Rating
40.0 rockwell c and 43.0 rockwell c
Countersink Angle
100.0 degrees
Surface Finish
32.0 microinches grip
Material
Steel
Surface Treatment
Cadmium
Surface Treatment Specification
Nas 672 assn standard single treatment response
Thread Series Designator
Unf
NSN
5305-00-144-3444
Part Number
HT403A7-20
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 HT403A7-20 NSN 5305-00-144-3444

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:
U
ESD:
ESD:
MMAC:
CRITL:
X

Freight Classification

NMFC
UFC
LTL
LCL
WCC
TCC
SHC
ACC
NMFC:
093486
UFC:
48950
LTL:
RATING VARIABLE
LCL:
50.0
WCC:
713
TCC:
Z
SHC:
9
ACC:
Construction Materials

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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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