Abstract： ASME B18.21.1:2009 pdf download.Washers: Helical Spring-Lock,Tooth Lock, and Plain Washers (Inch Series). 1.8 Lot For all inspections referenced in this Standard, the lot shall consist of all washers of one type, grade, style, finish, and s...

ASME B18.21.1:2009 pdf download.Washers: Helical Spring-Lock,Tooth Lock, and Plain Washers (Inch Series).

1.8 Lot

For all inspections referenced in this Standard, the lot shall consist of all washers of one type, grade, style, finish, and size

fabricated by the same production process from the same heat number of metal as provided by the metal manufacturer, and submitted

for inspection and testing at the same time. The maximum lot size shall be restricted to one shift of production.

1.8.1 Unless otherwise specified by the purchaser. unhardened plain washers (see para. 1.3.3) do not require lot control or heat

control and are not subject to the maximum lot size requirement.

NOTE: It is common to produce unhardeiwd plain washers from scrap steel that does not normally have material heat traceability.

1.9 Inspection and Quality Assurance

Unless otherwise specified, acceptability of this Standard shall be evaluated in accordance with

ASME B18.18.2.

2 GENERAL DATA FOR HELICAL SPRING-LOCK WASHERS

2.1 ApplicatIon: Helical Spring-Lock Washers

The helical spring-lock washers covered in this Standard are intended for general applications. Helical spring-lock washers

compensate for developed looseness between component parts of an assembly and pro‘ide a hardened bearing surface

2.2 Dimensions: Helical Spring-Lock Washers

The dimensions of regular, extra duty, and high-collar helical spring-lock washers shall be specified in Tables I through 4.

Selection should be made from the regular, heavy, extra duty, or high-ollar series in Tables 1, 2, 3, and 4, respectively, to

stilt design requirements.

2.3 Material and Hardness: Helical Spring-Lock Washers.

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