Model: M20558

Lock Washer

Properties:

Hole Diameter

Between 0.636 inches and 0.653 inches

Outside Diameter

1.079 inches

Material Thickness

Between 0.156 inches and 0.166 inches

End Application

W/s: boilers, 1200 psi; support equipment, b-1 aircraft; elevators, aircraft; vehicle, aircraft refueler r-14; stream (std. Tensioned replenishment at sea method); airborne mobile dir air ctl (2id), (02mjul83)(an/uyq-3a); mtvr family (includes tamcns d0198, d1062, d1073, & d1213); fire pumps; l.P. Compressors; communications terminal, satellite an/gsc-3 (v)1; 2320-01-097-0260 hemtt (heavy expanded mobility tactical trucks)

Hardness Rating

Between 45.0 rockwell c and 53.0 rockwell c

Material

Steel comp 1060 or steel comp 1561 or steel comp 1064 or steel comp 1065 or steel comp 1566 or steel comp 1069 or steel comp 1070 or steel comp 1572 or steel comp 1074 or steel comp 1075 or steel comp 1080

Material Specification

66 federal standard all material responses

Surface Treatment

Cadmium and chromate

Style Designator

Split helical-right hand

Departure From Cited Designator

As modified by surface treatment

NSN

5310-00-820-6653

Part Number

M20558

Description

Washer,lock

CAGE

61038

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 M20558 NSN 5310-00-820-6653

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:

Packaging & Shipping

Est. Pack Size

Est. Pack Weight

Est. Item Weight

Est. Item Dim.

Pack Size:

Paclk Weight:

2.3000lbs

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:

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