Model: 991-4-00172-001

Hex Castellated Self-locking Nut

Properties:

Thread Class

Thread Direction

Right-hand

Locking Feature

Prevailing torque with nonmetallic insert

Nut Style

Castellated, hexagon

Nut Height

0.145 inches

Width Across Flats

0.207 inches

Thread Series

Unf

Thready Qty Per Inch (tpi)

Thread Size

0.073 inches

Bearing Surface Type

Chamfered

Part Name Assigned By Controlling Agency

Navy special project

Material

Plastic locking insert

Material

Steel except insert

Surface Treatment

Cadmium except insert and chromate except insert

NSN

5310-01-048-5329

Part Number

991-4-00172-001

Description

Nut,self-locking,castellated,hex

CAGE

05457

A nut having 6 flat sides, flat on the bottom and having a slotted cylindrical or dome shaped upper portion. An integral feature is incorporated for locking on the threads of a mating member. The slots when used in conjunction with a solid or split (cotter) pin, act as an extra "fail safe" feature in critical applications. Excludes nut (1), self-locking, slotted, hexagon.

Part 991-4-00172-001 NSN 5310-01-048-5329

INC

FIIG

Concept No.

App. Key

Cond. Code

Status

INC:

29725

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:

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