Model: K641212-11

Shouldered And Recessed Washer

Properties:

Hole Diameter

Between 2.250 inches and 2.252 inches

Shoulder Diameter

Between 2.615 inches and 2.617 inches

Outside Diameter

Between 2.872 inches and 2.873 inches

Recess Diameter

2.500 inches

Shoulder Height

Between 0.174 inches and 0.178 inches

Recess Depth

Between 0.175 inches and 0.185 inches

Material Thickness

Between 0.416 inches and 0.420 inches

Hardness Rating

90.0 rockwell b

Surface Finish

63.0 microinches all surfaces

Material

Aluminum alloy

Material Specification

Ams 4640 assn standard single material response

Style Designator

Shouldered and recessed

NSN

5310-00-160-1590

Part Number

K641212-11

Description

Washer,shouldered And Recessed

CAGE

84955

A washer, round in shape, having a centrally located hole. One bearing surface is flat, the other surface is in the form of a raised shoulder (boss) having a flat bearing surface. Either or both of the bearing surfaces must be broken by a counterbore, countersink, or similar shaped recess. The thickness of the shoulder (boss) must not exceed 25 percent of the shoulder (boss) diameter. For items having a shoulder (boss) of greater thickness, use bearing, sleeve; bushing, sleeve; or spacer, sleeve. Excludes insulator, washer and thrust type washers.

Part K641212-11 NSN 5310-00-160-1590

INC

FIIG

Concept No.

App. Key

Cond. Code

Status

INC:

15935

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:

0.3000lbs

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:

194120

UFC:

95100

LTL:

RATING VARIABLE

LCL:

WCC:

713

TCC:

SHC:

ACC:

Construction Materials

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Schedule B and Export

Schedule B: 7616108000
SITC: 69440
End Use: Finished metal shapes
NAICS: 332722
USDA: 1

Freight Class: Cotters, cotter-pins, washers and similar articles, of aluminum