Model: 91581A355

Hexagon Self-locking Nut

Special Features:

Finish: black luster-coated; inch thread size: 0.250 inch-20; astm specifications: astm b117; note: coating does not interfere with thread enganement; withstands salt spray of 500 hours; nuts shorter than 4 inches are fully threaded; nuts longer than 4 inches are not continuously threaded

Properties:

Thread Class

Thread Direction

Right-hand

Nut Style

Hexagon

Nut Height

0.203 inches

End Application

2540-01-566-6751; gunners seat and restraint system

Width Across Flats

0.437 inches

Thread Series

Unc

Hardness Rating

32.0 rockwell c

Part Name Assigned By Controlling Agency

1/4-20 nylon lock nut

Material

Plastic nylon locking insert

Material

Steel except insert

NSN

5310-01-570-1858

Part Number

91581A355

Description

Nut,self-locking,hexagon

CAGE

39428

A nut having a flat bottom and 6 sides. An integral feature is incorporated for locking on the threads of a mating member. Excludes nut (1), self-locking, cap.

Part 91581A355 NSN 5310-01-570-1858

INC

FIIG

Concept No.

App. Key

Cond. Code

Status

INC:

05277

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: 8710000090
SITC: 89111
End Use: Military trucks, armored vehicles, etc.
NAICS: 336992
USDA: 1

Freight Class: Parts of armored fighting vehicles,motorized, whether or not fitted with weapons