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

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

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:

Cond. Code:

Status:

Material Classification

Hazardous material, precious metals, criticality, enviroment, and electrostatic discharge indicators

HMIC

PMIC

ESD/EMI

ENAC

MMAC

CRITL

HMIC:

PMIC:

ESD:

MMAC:

CRITL:

Freight Classification

NMFC

UFC

LTL

LCL

WCC

TCC

SHC

ACC

NMFC:

096640

UFC:

50600

LTL:

70.0

LCL:

WCC:

713

TCC:

SHC:

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