Model: A51B20528-11

Octagon Plain Nut
Description:

3b thread class, right-hand , plain, octagon nut style, 0.312 inches nut height, 2.375 inches width across flats, unj thread series.

Properties:

Thread Class
3b
Thread Direction
Right-hand
Nut Style
Plain, octagon
Nut Height
0.312 inches
Nut Height
0.312 inches
Width Across Flats
2.375 inches
Thread Series
Unj
Thready Qty Per Inch (tpi)
12
Hardness Rating
Between 38.0 rockwell c and 45.0 rockwell c
Thread Size
1.938 inches
Countersink Angle
90.0 degrees nut
Bearing Surface Type
Chamfered
Bearing Surface Finish
125.0 microinches
Part Name Assigned By Controlling Agency
Navy special project
Material
Steel comp 630
Material Specification
Ams 5643 assn standard single material response
Surface Treatment
Passivate
Surface Treatment Specification
Qq-p-35 federal specification single treatment response
Test Data Document
81349-mil-i-6868 specification (includes engineering type bulletins, brochures, etc., that reflect specification type data in specification format; excludes commercial catalogs, industry directories, and similar trade publications, reflecting general type data on certain environmental and performance requirements and test conditions that are shown as "typical", "average", "", etc.).
NSN
5310-00-003-3888
Part Number
A51B20528-11
Description
Nut,plain,octagon
CAGE
61174

A nut, flat on top and bottom, having eight flat sides. It may include a retaining dowel pin. For items having a thickness (or height) exceeding two times the width across the flats, use post, electrical-mechanical equipment. (when height or thickness and/or width across the flats is designated as a tolerance dimension, the maximum dimension will be used to determine compliance).

Part A51B20528-11 NSN 5310-00-003-3888

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
16979
FIIG:
A021A0
Concept No.:
1
App. Key:
AG
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:
--
WCC:
573
TCC:
Z
SHC:
9
ACC:
Construction Materials

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Schedule B and Export
  • Schedule B: 7318160000
  • SITC: 69421
  • End Use: Finished metal shapes
  • NAICS: 332722
  • USDA: 1

Freight Class: Nuts of iron or steel

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