Model: 11831-4-20

Close Tolerance Bolt

Special Features:

Bolt-close tolerance, 12 point, flange head, 220 ksi ftu, cres; undrilled

Properties:

Thread Class
3a
Thread Direction
Right-hand
Thread Length
0.468 inches
Fastener Length
2.028 inches
Head Style
Double hexagon extended washer
Head Height
0.300 inches
Width Between Flats
0.348 inches
Extended Washer Diameter
0.433 inches
Extended Washer Thickness
0.069 inches
Grip Diameter
0.249 inches
End Application
Nimrod 2000
Thread Diameter
0.250 inches
Grip Length
1.240 inches
Thready Qty Per Inch (tpi)
28
Min. Tensile Strength (psi)
4440 pounds per square inch
Part Name Assigned By Controlling Agency
Close tolerance bolt
Material
Steel comp xm-13
Material Specification
Ams-5629 assn standard 1st material response
Surface Treatment
Passivate
Surface Treatment Specification
Ams-qq-p-35 assn standard 1st treatment response
Thread Series Designator
Unjf
NSN
5306-01-570-1471
Part Number
11831-4-20
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 11831-4-20 NSN 5306-01-570-1471

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:
A
ESD:
A
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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