Model: 420988

Assembled Washer Screw

Properties:

Thread Class

Thread Direction

Right-hand

Thread Length

Between 0.153 inches and 0.289 inches

Fastener Length

Between 0.281 inches and 0.312 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)

Hardness Rating

40.0 rockwell c and 50.0 rockwell c

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 Specification

Sae assn standard all material responses

Surface Treatment

Cadmium or zinc

Surface Treatment Specification

Qq-p-416, type 1, cl 3 federal specification 1st treatment response or qq-z-325, type 1, cl 3 federal specification 2nd treatment response

Thread Series Designator

Unc

NSN

5305-00-042-0988

Part Number

420988

Description

Screw,assembled Washer

CAGE

21450

Part 420988 NSN 5305-00-042-0988

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:

50.0

WCC:

713

TCC:

SHC:

ACC:

Construction Materials

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