Model: 420991

Assembled Washer Screw

Properties:

Thread Class

Thread Direction

Right-hand

Thread Length

Between 0.369 inches and 0.469 inches

Fastener Length

Between 0.469 inches and 0.500 inches

Head Style

Round

Head Diameter

Between 0.443 inches and 0.472 inches

Head Height

Between 0.160 inches and 0.175 inches

Washer Quantity

Internal Drive Style

Slot

Thread Diameter

0.250 inches

Thready Qty Per Inch (tpi)

Primary Washer Outside Diameter

Between 0.460 inches and 0.475 inches

Primary Washer Style

Flat external teeth

Primary Washer Material Thickness

Between 0.023 inches and 0.028 inches

Material

Steel comp 1050 primary washer

Material

Steel fastener

Material Specification

66, 1010-1020 federal standard single material response fastener

Material Specification

Sae assn standard single material response primary washer

Surface Treatment

Cadmium fastener

Surface Treatment

Zinc primary washer

Surface Treatment Specification

Qq-p-416, type 1, cl 3 federal specification single treatment response fastener

Surface Treatment Specification

Qq-z-325, type 1, cl 3 federal specification single treatment response primary washer

Thread Series Designator

Unc

NSN

5305-00-042-0991

Part Number

420991

Description

Screw,assembled Washer

CAGE

21450

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

Part 420991 NSN 5305-00-042-0991

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:

Packaging & Shipping

Est. Pack Size

Est. Pack Weight

Est. Item Weight

Est. Item Dim.

Pack Size:

Paclk Weight:

1.1000lbs

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:

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