Model: 78238-428

Double Hexagon Self-locking Nut

Special Features:

Nut is castellated with six slots equally spaced 0.090 in. W, 0.091 deep

Properties:

Thread Class

Thread Direction

Right-hand

Locking Feature

Prevailing torque all metal design

Lubrication

Dry film lubricant

Nut Height

0.238 inches

Width Across Flats

0.120 inches

Thread Series

Unjf

Thready Qty Per Inch (tpi)

Hardness Rating

Between 40.0 rockwell c and 44.0 rockwell c

Thread Size

0.250 inches

Bearing Surface Type

Chamfered

Material

Steel comp h11

Material Specification

Ams 6487 assn standard single material response

Surface Treatment

Cadmium

Surface Treatment Specification

Mil-c-8337, type ii, cl 2 military specification single treatment response

NSN

5310-01-056-8763

Part Number

78238-428

Description

Nut,self-locking,double Hexagon

CAGE

56878

A nut having 12 drive points and 24 sides. The bearing surface may be washer faced. An integral locking feature is incorporated in the design of the head or in the threads.

Part 78238-428 NSN 5310-01-056-8763

INC

FIIG

Concept No.

App. Key

Cond. Code

Status

INC:

05276

FIIG:

A021A0

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:

Packaging & Shipping

Est. Pack Size

Est. Pack Weight

Est. Item Weight

Est. Item Dim.

Pack Size:

Paclk Weight:

0.1000lbs

Item Weight:

Item Dim:

OPI

SPI No.

SPI Rev.

SPC Mkg.

LVL A

LVL B

OPI:

SPI No.:

SPI Rev.:

SPC Mkg:

LVL_A:

LVL_B:

Freight Classification

NMFC

UFC

LTL

LCL

WCC

TCC

SHC

ACC

NMFC:

093486

UFC:

48950

LTL:

RATING VARIABLE

LCL:

WCC:

573

TCC:

SHC:

ACC:

Construction Materials

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Schedule B and Export

Schedule B: 7318160000
SITC: 69421
End Use: Finished metal shapes
NAICS: 332722
USDA: 1

Freight Class: Nuts of iron or steel