Model: AN178-43

Close Tolerance Bolt

Properties:

Thread Class
3a
Thread Direction
Right-hand
Thread Length
Between 0.704 inches and 0.828 inches
Fastener Length
Between 4.408 inches and 4.500 inches
Head Style
Hexagon
Head Height
Between 0.265 inches and 0.297 inches
Width Between Flats
Between 0.740 inches and 0.752 inches
Grip Diameter
Between 0.4986 inches and 0.4991 inches
Shank Unthreaded Hole Diameter
0.106 inches first hole and 0.116 inches first hole
Thread Diameter
0.500 inches
Grip Length
Between 3.672 inches and 3.704 inches
Thready Qty Per Inch (tpi)
20
Min. Tensile Strength (psi)
125000 pounds per square inch
Hardness Rating
26.0 rockwell c and 32.0 rockwell c
Distance From Head Largest Bearing Surface To Shank Hole Center
4.281 inches first hole and 4.313 inches first hole
Surface Finish
63.0 microinches bearing surface of head
Surface Finish
63.0 microinches grip
Material
Steel comp 4140 or steel comp 8740 or steel comp 8630 or steel comp 8735 or steel comp 4130 or steel comp 4037
Surface Treatment
Cadmium and chromate
Surface Treatment Specification
Qq-p-416, type 2, class 3 federal specification single treatment response
Thread Series Designator
Unf
NSN
5306-00-180-0340
Part Number
AN178-43
Description
Bolt,close Tolerance
CAGE

An externally threaded fastener whose unthreaded portion is of a specified grip length, plated or unplated, and is machined to a tolerance of one thousandth (0.001) of an inch (0.025 mm) or less of a specific diameter for items one inch (25 mm) or less in diameter. Items over one inch (25 mm) in diameter shall have a tolerance of fifteen ten-thousandths (0.0015) of an inch (0.038 mm) or less. The nominal major diameter of the threads shall be at least one thousandth (0.001) of an inch (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 not designed to be held or driven with an inserted driver, nor is it designed for rotation by the thumb and fingers. A locking feature may be incorporated in the design of the head or threads. For items having close tolerance, and fabricated from material having 160,000 pounds per square inch (1100 megapascals) minimum tensile strength, see bolt, shear. For items fabricated from material having less than 160,000 pounds per square inch (1100 megapascals) minimum tensile strength and not having a close tolerance, see bolt, machine.

Part AN178-43 NSN 5306-00-180-0340

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
27851
FIIG:
A003B0
Concept No.:
App. Key:
BC
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:
X

Packaging & Shipping

Est. Pack Size
Est. Pack Weight
Est. Item Weight
Est. Item Dim.
Pack Size:
--
Paclk Weight:
--
Item Weight:
--
Item Dim:
--
OPI
SPI No.
SPI Rev.
SPC Mkg.
LVL A
LVL B
OPI:
M
SPI No.:
SPI Rev.:
SPC Mkg:
LVL_A:
E
LVL_B:
Q

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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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