Model: 6202B2520-4A

Externally Relieved Body Screw

Special Features:

Cone point 55 to 65 degrees of angle by 0.250 in.Lg by 0.159 in. Min, 0.175 in. Max dia

Properties:

Thread Class
2a
Thread Direction
Right-hand
Thread Length
Between 0.370 inches and 0.780 inches
Fastener Length
Between 1.120 inches and 1.130 inches
Head Style
Knurled no. 2
Head Diameter
Between 0.745 inches and 0.755 inches
Head Height
Between 0.369 inches and 0.381 inches
First Diameter From Head
Between 0.170 inches and 0.180 inches
Distance From Largest Bearing Surface Of Head To End Of First Diameter
Between 0.490 inches and 0.510 inches
Internal Drive Style
Slot
Thread Diameter
0.250 inches
Thready Qty Per Inch (tpi)
20
Externally Relieved Body Diameter Quantity
1
Part Name Assigned By Controlling Agency
Navy special project
Material
Copper alloy 360
Material Specification
Qq-b-626, 1/2 h federal specification single material response
Surface Treatment
Cadmium and chromate
Surface Treatment
Cadmium and chromate
Surface Treatment Specification
Qq-p-416, type 2, cl 3 federal specification all treatment responses
Thread Series Designator
Unc
NSN
5305-00-282-2026
Part Number
6202B2520-4A
Description
Screw,externally Relieved Body
CAGE
1YGB8

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 undercut for thread relief). It is no. 0 (0.060 in.) (1.5 mm) or larger, and is designed to be held or driven with either a wrench or inserted driver (excluding internal socket and multiple spline types) or both in sizes below no. 10 (0.190 in.) (5 mm) and larger sizes must have a head designed for any type inserted driver (excluding internal socket and multiple spline types) but may also be designed for external wrenching. A locking feature may be incorporated in the design of the head or threads. See also bolt, externally relieved body and bolt, internal wrenching.

Part 6202B2520-4A NSN 5305-00-282-2026

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
01852
FIIG:
A003B0
Concept No.:
App. Key:
SE
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

Freight Classification

NMFC
UFC
LTL
LCL
WCC
TCC
SHC
ACC
NMFC:
096660
UFC:
50620
LTL:
100.0
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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