Model: ASM2 B18.21.1

Lock Washer

Properties:

Hole Diameter

Between 0.448 inches and 0.464 inches

Outside Diameter

Between 0.740 inches and 0.789 inches

Material Thickness

Between 0.032 inches and 0.040 inches

End Application

W/s: truck, heavy expanded mobility tactical (hemtt); m1a2 abrams tank, 2350-01-328-5964 (eaa cmbt85pk3); missile, advanced medium range air-to-air (amraam)/aim120a; support equipment, b-1 aircraft; aircraft, c-18a, ec-18b; helicopter landing system, lamps mk iii; smoke generator set, m157a2; radar set, an/pps-5b; armored security vehicle, model xm1117; tactical air opns module (an/tyq (23))

Hardness Rating

Between 40.0 rockwell c and 50.0 rockwell c

Material

Steel comp 1060 or steel comp 1070 or steel comp 1078 or steel comp 1080

Material Specification

66 federal standard all material responses

Surface Treatment

Cadmium and chromate

Surface Treatment Specification

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

Style Designator

Flat internal teeth

Nondefinitive Specification/std Data

1 type and a grade and 1 style and 1 composition

NSN

5310-00-685-3228

Part Number

ASM2 B18.21.1

Description

Washer,lock

CAGE

05047

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 ASM2 B18.21.1 NSN 5310-00-685-3228

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:

0.2000lbs

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