Model: A51B21644-21

Recessed Washer

Special Features:

Top surface chamfered 0.200 in. By 45 deg

Properties:

Hole Diameter

Between 0.514 inches and 0.523 inches

Outside Diameter

1.550 inches

Recess Diameter

1.014 inches

Material Thickness

0.270 inches

Hardness Rating

Between 46.0 rockwell c and 49.0 rockwell c

Recess Angle

100.0 degrees

Surface Finish

125.0 microinches all surfaces

Part Name Assigned By Controlling Agency

Navy special project

Material

Steel

Material Specification

G-1013, comp d6ac mfr ref single material response

Surface Treatment

Cadmium

Surface Treatment Specification

Mil-c-8837, type 2, class 1 military specification single treatment response

Style Designator

15 recessed

NSN

5310-01-076-9428

Part Number

A51B21644-21

Description

Washer,recessed

CAGE

61174

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 A51B21644-21 NSN 5310-01-076-9428

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:

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