Model: 1220

Lock Washer

Properties:

Hole Diameter

Between 0.384 inches and 0.398 inches

Outside Diameter

Between 0.670 inches and 0.692 inches

Material Thickness

Between 0.032 inches and 0.040 inches

Hardness Rating

Between 40.0 rockwell c and 50.0 rockwell c

Material

Steel

Material Specification

Fed standard 66, aisi c1050 through c1064 or sae 1050 through 1064 federal standard all material responses

Surface Treatment

Cadmium

Surface Treatment Specification

Qq-p-416, type 2, cl 3 federal specification single treatment response

Style Designator

Flat internal teeth

Nondefinitive Specification/std Data

A type

NSN

5310-00-013-8542

Part Number

1220

Description

Washer,lock

CAGE

78189

A washer which is usually round with a centrally located hole. Its edges and two bearing surfaces are so designed that applied pressure brings into play the spring tension and/or frictional locking principle which materially resists any tendency toward turning. It may be made of one or two pieces

Part 1220 NSN 5310-00-013-8542

INC

FIIG

Concept No.

App. Key

Cond. Code

Status

INC:

14218

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: 7318210000
SITC: 69422
End Use: Finished metal shapes
NAICS: 332722
USDA: 1

Freight Class: Spring washers and other lock washers, iron or steel