Model: M491

Square Plain Nut

Properties:

Thread Class
2b
Thread Direction
Right-hand
Nut Style
Square
Nut Height
Between 0.310 inches and 0.346 inches
Width Across Flats
Between 0.606 inches and 0.6250 inches
Thread Series
Unc
Thready Qty Per Inch (tpi)
16
Thread Size
0.375 inches
Bearing Surface Type
Washer faced
Material
Steel
Nondefinitive Specification/std Data
B-2 type
NSN
5310-00-207-9413
Part Number
M491
Description
Nut,plain,square
CAGE
87764

A nut, flat on top and bottom, having 4 flat sides. 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 M491 NSN 5310-00-207-9413

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
01858
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:
50.0
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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