Model: 21-421

Spring Tension Washer

Special Features:

Six equally spaced tabs 0.062 in. Wide with 0.031 in. Slot 0.016 in. From outside diameter to center hole

Properties:

Hole Diameter

Between 0.126 inches and 0.128 inches

Outside Diameter

Between 0.249 inches and 0.251 inches

Overall Height

0.039 inches

Material Thickness

Between 0.010 inches and 0.012 inches

Material

Copper alloy 510

Material Specification

Ams 4510 assn standard single material response

Surface Treatment

Nickel

Surface Treatment Specification

Qq-n-290 cl 1 type 4 federal specification single treatment response

Style Designator

Spring tension

NSN

5310-00-033-3101

Part Number

21-421

Description

Washer,spring Tension

CAGE

35918

A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.

Part 21-421 NSN 5310-00-033-3101

INC

FIIG

Concept No.

App. Key

Cond. Code

Status

INC:

15938

FIIG:

A022B0

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:

194160

UFC:

55210

LTL:

50.0

LCL:

WCC:

713

TCC:

SHC:

ACC:

Construction Materials

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Schedule B and Export

Schedule B: 7415210000
SITC: 69432
End Use: Finished metal shapes
NAICS: 332722
USDA: 1

Freight Class: Copper washers including spring washers not threaded