Model: 140-007-20-18C4

Recessed Washer

Properties:

Hole Diameter

Between 0.312 inches and 0.322 inches

Outside Diameter

Between 0.552 inches and 0.572 inches

Material Thickness

Between 0.120 inches and 0.130 inches

Min. Tensile Strength (psi)

240000 pounds per square inch

Top Recess Diameter

Between 0.382 inches and 0.392 inches

Bottom Recess Angle

Between 89.5 degrees and 90.5 degrees

Top Recess Angle

Between 89.5 degrees and 90.5 degrees

Bottom Recess Diameter

Between 0.382 inches and 0.392 inches

Surface Finish

63.0 microinches bottom

Surface Finish

63.0 microinches top

Material

Steel comp h11

Material Specification

Ams 6485 assn standard single material response or ams 6487 assn standard single material response

Surface Treatment

Cadmium and chromate

Surface Treatment Specification

Mil-c-8837, type 2, cl 2 military specification single treatment response

Style Designator

Recessed both sides

NSN

5310-01-256-9736

Part Number

140-007-20-18C4

Description

Washer,recessed

CAGE

97499

A washer of any peripheral shape having a centrally located hole. Both bearing surfaces are parallel and flat, but one or both of the bearing surfaces must be broken by a counterbore, countersink, or similarly shaped recess. The thickness must not exceed 25 per cent of the outside diameter or the largest outside dimension. The maximum limit of the tolerance or range applied to the thickness and/or largest outside dimension must be used to determine compliance. Excludes washer, concave, retainer, packing, and thrust type washers. See also spacer, sleeve; and spacer, stepped.

Part 140-007-20-18C4 NSN 5310-01-256-9736

INC

FIIG

Concept No.

App. Key

Cond. Code

Status

INC:

15933

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:

0.1000lbs

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:

194160

UFC:

55210

LTL:

50.0

LCL:

WCC:

713

TCC:

SHC:

ACC:

Construction Materials

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Schedule B and Export

Schedule B: 7318220000
SITC: 69422
End Use: Finished metal shapes
NAICS: 332722
USDA: 1

Freight Class: Washers other than lock washers, iron or steel