Model: NAS720B8-4

Assembled Washer Screw

Properties:

Thread Class
2a
Thread Direction
Right-hand
Thread Length
Between 0.202 inches and 0.250 inches
Fastener Length
Between 0.218 inches and 0.250 inches
Head Style
Pan no. 2
Head Diameter
Between 0.306 inches and 0.322 inches
Head Height
Between 0.085 inches and 0.096 inches
Washer Quantity
2
Internal Drive Style
Offset cruciform (torque set)
Thread Diameter
0.164 inches
Thready Qty Per Inch (tpi)
32
Min. Tensile Strength (psi)
55000 pounds per square inch
Secondary Washer Relationship To Primary Washer
Not identical
Secondary Washer Style
Flat
Primary Washer Outside Diameter
0.293 inches
Secondary Washer Outside Diameter
Between 0.307 inches and 0.317 inches
Primary Washer Style
Split helical ring
Primary Washer Material Thickness
0.040 inches
Secondary Washer Material Thickness
Between 0.013 inches and 0.019 inches
Material
Copper alloy 230 fastener or copper alloy 240 fastener or copper alloy 260 fastener or copper alloy 268 fastener or copper alloy 342 fastener or copper alloy 353 fastener or copper alloy 360 fastener or copper alloy 377 fastener
Material
Copper alloy 260 secondary washer or copper alloy 268 secondary washer
Material
Copper alloy 510 primary washer
Material Specification
Qq-p-613 federal specification single material response secondary washer
Material Specification
Qq-p-750, comp a federal specification single material response primary washer
Surface Treatment
Tin
Surface Treatment Specification
Qq-n-290 federal specification single treatment response
Thread Series Designator
Unc
Specification Data
80205-nas720 professional/industrial association standard
NSN
5305-01-121-2689
Part Number
NAS720B8-4
Description
Screw,assembled Washer
CAGE
80205

A screw, (as modified) to which has been assembled one or more nonremovable washer(s).

Part NAS720B8-4 NSN 5305-01-121-2689

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
06660
FIIG:
A003B0
Concept No.:
App. Key:
SA
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

Freight Classification

NMFC
UFC
LTL
LCL
WCC
TCC
SHC
ACC
NMFC:
093460
UFC:
48930
LTL:
70.0
LCL:
--
WCC:
713
TCC:
Z
SHC:
9
ACC:
Construction Materials

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Schedule B and Export
  • Schedule B: 7415338550
  • SITC: 69433
  • End Use: Finished metal shapes
  • NAICS: 332722
  • USDA: 1

Freight Class: Other copper screws (not for wood) bolts and nuts

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