Model: BLT1957

Externally Relieved Body Bolt

Properties:

Thread Class
1a
Thread Direction
Right-hand
Thread Length
Between 0.502 inches and 0.522 inches
Fastener Length
Between 1.052 inches and 1.072 inches
Head Style
Double hexagon extended washer
Head Height
Between 0.320 inches and 0.340 inches
Width Between Flats
Between 0.304 inches and 0.313 inches
Extended Washer Diameter
Between 0.428 inches and 0.448 inches
Extended Washer Thickness
Between 0.060 inches and 0.070 inches
First Diameter From Head
Between 0.246 inches and 0.249 inches
Second Diameter From Head
Between 0.190 inches and 0.195 inches
Distance From Largest Bearing Surface Of Head To End Of First Diameter
Between 0.055 inches and 0.075 inches
Distance From Largest Bearing Surface Of Head To End Of Second Diameter
Between 0.530 inches and 0.550 inches
Thread Diameter
0.250 inches
Thready Qty Per Inch (tpi)
28
Externally Relieved Body Diameter Quantity
2
Material
Iron alloy 660
Material Specification
Ams 5731 assn standard single material response
Thread Series Designator
Unf
NSN
5306-00-879-3339
Part Number
BLT1957
Description
Bolt,externally Relieved Body
CAGE
K0680

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 BLT1957 NSN 5306-00-879-3339

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:
SX
CRITL:
X

Packaging & Shipping

Est. Pack Size
Est. Pack Weight
Est. Item Weight
Est. Item Dim.
Pack Size:
--
Paclk Weight:
0.1000lbs
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: 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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