Model: 21-904

Octagon Plain Nut

Properties:

Thread Class
3b
Thread Direction
Right-hand
Nut Style
Plain, octagon
Nut Height
Between 0.305 inches and 0.319 inches
End Application
W/s; trlr, cargo, 3/4t, 2-whl, tam d08607; guided missile, intercept; trailer tank, water 400 gal, m149a2; chassis, trlr, gp, 3 1/2t, 2-whl, tam d00807; cargo trailer, m105a3
Width Across Flats
Between 3.344 inches and 3.406 inches
Thread Series
Un
Features Provided
Casehardened
Thready Qty Per Inch (tpi)
16
Hardness Rating
Between 89.0 rockwell superficial 15-n and 91.0 rockwell superficial 15-n
Thread Size
2.625 inches
Countersink Angle
90.0 degrees nut and 100.0 degrees nut
Bearing Surface Type
Chamfered or washer faced
Material
Steel comp 1015 or steel comp 1016 or steel comp 1017 or steel comp 1018 or steel comp 1019 or steel comp 1020 or steel comp 1022 or steel comp 1023 or steel comp 1025
NSN
5310-00-741-1379
Part Number
21-904
Description
Nut,plain,octagon
CAGE
0W357

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 21-904 NSN 5310-00-741-1379

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:
SX
CRITL:
X

Packaging & Shipping

Est. Pack Size
Est. Pack Weight
Est. Item Weight
Est. Item Dim.
Pack Size:
--
Paclk Weight:
0.4000lbs
Item Weight:
--
Item Dim:
--
OPI
SPI No.
SPI Rev.
SPC Mkg.
LVL A
LVL B
OPI:
O
SPI No.:
SPI Rev.:
SPC Mkg:
00
LVL_A:
E
LVL_B:
Q

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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