Model: 321921-4

Externally Relieved Body Bolt

Properties:

Thread Class
2a
Thread Direction
Right-hand
Thread Length
0.350 inches
Fastener Length
1.203 inches
Head Style
Hexagon
Head Height
0.250 inches
Width Between Flats
0.438 inches
First Diameter From Head
0.220 inches
Second Diameter From Head
Between 0.177 inches and 0.187 inches
Distance From Largest Bearing Surface Of Head To End Of First Diameter
0.250 inches
Distance From Largest Bearing Surface Of Head To End Of Second Diameter
0.853 inches
Thread Diameter
0.250 inches
Thready Qty Per Inch (tpi)
20
Externally Relieved Body Diameter Quantity
2
Material
Stainless steel
Material Specification
Ams 5643 assn standard single material response
Surface Treatment
Passivate
Surface Treatment Specification
Qq-p-35 type 1 federal specification single treatment response
Thread Series Designator
Unc
NSN
5306-01-081-8080
Part Number
321921-4
Description
Bolt,externally Relieved Body
CAGE
96214

An externally threaded fastener whose threaded portion is of one nominal diameter, and whose unthreaded portion has been machined or ground in one or more places or over its entire length to a maximum diameter less than the minimum pitch diameter of the thread (excludes undercuts for thread relief). It is no. 10 (0.190 in.) (5 mm) or larger in size and has a head which is not designed to be held or driven with an inserted driver or designed for rotation by the thumb and fingers. A locking feature may be incorporated in the design of the head or threads. Excludes bolt, internal wrenching and thumbscrew. See also screw, externally relieved body.

Part 321921-4 NSN 5306-01-081-8080

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
06675
FIIG:
A003B0
Concept No.:
App. Key:
BF
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

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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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