Model: HT408A4-47

Close Tolerance Screw

Special Features:

O-ring included

Properties:

Thread Class
3a
Thread Direction
Right-hand
Thread Length
0.469 inches
Fastener Length
3.407 inches
Head Style
Flat countersunk undercut
Head Diameter
Between 0.502 inches and 0.506 inches
Head Height
Between 0.071 inches and 0.073 inches
Grip Diameter
Between 0.2485 inches and 0.2495 inches
Internal Drive Style
High-torque
Thread Diameter
0.250 inches
Grip Length
2.938 inches
Thready Qty Per Inch (tpi)
28
Hardness Rating
36.0 rockwell c and 40.0 rockwell c
Countersink Angle
100.0 degrees
Material
Steel comp 4130 or steel comp 4140 or steel comp 4340 or steel comp 8735 or steel comp 8740
Surface Treatment
Cadmium
Surface Treatment Specification
Qq-p-416 ty ii cl b federal specification single treatment response
Thread Series Designator
Unjf
NSN
5305-00-144-4096
Part Number
HT408A4-47
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 HT408A4-47 NSN 5305-00-144-4096

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

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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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