Model: 620B644

Socket Head Cap Screw

Special Features:

3 slots in head 120.0 degrees apart, certified free from mercury contamination

Properties:

Thread Class
2a
Thread Direction
Right-hand
Head Style
Flat chamfer
Head Diameter
Between 0.735 inches and 0.750 inches
Head Height
Between 0.492 inches and 0.500 inches
Internal Drive Style
Hexagon
Thread Diameter
0.500 inches
Width Across Flats
0.375 inches
Thready Qty Per Inch (tpi)
13
Criticality Code Justification
Zzzy
Material
Steel comp 304
Material Specification
66 federal standard single material response
Surface Treatment
Passivate
Special Test Features
Special quality control testing
Surface Treatment Specification
Qq-p-35 federal specification single treatment response
Test Data Document
81349-mil-p-23199 specification (includes engineering type bulletins, brochures, etc., that reflect specification type data in specification format; excludes commercial catalogs, industry directories, and similar trade publications, reflecting general type data on certain environmental and performance requirements and test conditions that are shown as "typical", "average", "", etc.).
Thread Series Designator
Unc
Reference Number Differentiating Characteristics
As differentiated by material which must conform to ships parts control center special quality control provisions
NSN
5305-01-088-6835
Part Number
620B644
Description
Screw,cap,socket Head
CAGE
04808

An externally threaded fastener whose threaded portion is of one nominal diameter. The head has an internal socket or multiple spline for use with an inserted driver. A locking feature may be incorporated in the design of the head or threads. Excludes items with bevel (conical) heads. See bolt, internal wrenching. Excludes screw, shoulder; and screw, machine.

Part 620B644 NSN 5305-01-088-6835

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
16282
FIIG:
A003B0
Concept No.:
App. Key:
SC
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:
Y

Freight Classification

NMFC
UFC
LTL
LCL
WCC
TCC
SHC
ACC
NMFC:
093486
UFC:
48950
LTL:
RATING VARIABLE
LCL:
--
WCC:
713
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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