Model: 303B7491-1

Assembled Washer Screw

Properties:

Thread Class

Thread Direction

Right-hand

Thread Length

Between 0.398 inches and 0.500 inches

Fastener Length

0.813 inches

Head Diameter

0.500 inches

Head Height

Between 0.297 inches and 0.313 inches

Hole Diameter

0.164 inches

Washer Quantity

Internal Drive Style

Slot

Thread Diameter

0.190 inches

Thready Qty Per Inch (tpi)

Secondary Washer Relationship To Primary Washer

Not identical

Hole Configuration Style

Round

Secondary Washer Style

Flat

Primary Washer Style

Split helical ring

Material

Steel comp 303

Material Specification

Mil-s-7720, cond a military specification single material response

Surface Treatment

Passivate

Thread Series Designator

Unc

NSN

5305-00-301-0655

Part Number

303B7491-1

Description

Screw,assembled Washer

CAGE

94990

A screw, (as modified) to which has been assembled one or more nonremovable washer(s).

Part 303B7491-1 NSN 5305-00-301-0655

INC

FIIG

Concept No.

App. Key

Cond. Code

Status

INC:

06660

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:

093486

UFC:

48950

LTL:

RATING VARIABLE

LCL:

WCC:

573

TCC:

SHC:

ACC:

Equipment for Aircraft

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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