Model: ANSI B18.3.1MB1 831DH040020N

Socket Head Cap Screw

Properties:

Thread Direction
Right-hand
Thread Length
Between 20.0 millimeters and 23.5 millimeters
Fastener Length
Between 16.0 millimeters and 24.0 millimeters
Head Style
Flat chamfer
Head Diameter
Between 6.8 millimeters and 7.0 millimeters
Head Height
Between 3.88 millimeters and 4.00 millimeters
Internal Drive Style
Hexagon
Thread Diameter
4.0 millimeters
Width Across Flats
3.0 millimeters
Thread Pitch In Millimeters
0.7
External Thread Tolerance Class
6g
Part Name Assigned By Controlling Agency
Navy special project
Material
Stainless steel
Surface Treatment
Passivate
Surface Treatment Specification
Astm a380 assn standard single treatment response
Thread Series Designator
M
NSN
5305-01-384-3488
Part Number
ANSI B18.3.1MB1 831DH040020N
Description
Screw,cap,socket Head
CAGE
D9182

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 ANSI B18.3.1MB1 831DH040020N NSN 5305-01-384-3488

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:
A
ESD:
ESD:
MMAC:
CRITL:
X

Freight Classification

NMFC
UFC
LTL
LCL
WCC
TCC
SHC
ACC
NMFC:
096640
UFC:
50600
LTL:
70.0
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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