Model: MB251-3-8

Machine Bolt

Properties:

Thread Class
3a
Thread Direction
Right-hand
Thread Length
Between 0.313 inches and 0.363 inches
Fastener Length
Between 0.823 inches and 0.853 inches
Head Style
Hexagon
Head Height
Between 0.110 inches and 0.125 inches
Width Between Flats
Between 0.367 inches and 0.376 inches
Thread Diameter
0.190 inches
Thready Qty Per Inch (tpi)
32
Surface Finish
63.0 microinches bearing surface of head
Surface Finish
63.0 microinches grip
Surface Finish
63.0 microinches threads
Part Name Assigned By Controlling Agency
Navy special project
Material
Titanium alloy uns r54520
Material Specification
Nas 621 6al-4v assn standard single material response
Surface Treatment
Aluminum
Surface Treatment Specification
Mil-c-83488 type 2 cl 3 military specification single treatment response
Thread Series Designator
Unjf
NSN
5306-01-239-9394
Part Number
MB251-3-8
Description
Bolt,machine
CAGE
73197

An externally threaded fastener designed for insertion through holes in assembled parts and normally intended to be tightened or released by torquing a nut. the threaded and unthreaded portions are both of one nominal diameter of 0.190 inch (5 mm) or larger. The head is not designed to be held or driven with an inserted driver or by the thumb and fingers. a locking feature may be incorporated in the design of the head or threads. head dimensions and sizes of threaded and unthreaded portions shall conform to internationally recognized fastener standards. for items having a grip length portion machined to a tolerance of 0.0015 inch (0.038 mm) or less, bolt, shear. See also screw, cap, hexagon head and screw, machine.

Part MB251-3-8 NSN 5306-01-239-9394

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
01847
FIIG:
A003B0
Concept No.:
App. Key:
BR
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:
ESD:
MMAC:
CRITL:
X

Packaging & Shipping

Est. Pack Size
Est. Pack Weight
Est. Item Weight
Est. Item Dim.
Pack Size:
--
Paclk Weight:
--
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:
136500
UFC:
68455
LTL:
RATING VARIABLE
LCL:
--
WCC:
713
TCC:
Z
SHC:
9
ACC:
Construction Materials

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Schedule B and Export
  • Schedule B: 8108908000
  • SITC: 69985
  • End Use: Nonferrous metals, other
  • NAICS: 331491
  • USDA: 1

Freight Class: Other wrought titanium, nesoi

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