本标准涵盖了螺旋弹簧锁紧垫圈（#0至3英寸）、齿锁紧垫圈（#2至1 1/4英寸）和平垫圈（#0至3英寸）的尺寸要求、物理性能和相关试验方法。本标准中包含的尺寸数据并不意味着所描述的所有产品都是库存生产项目。消费者应就产品的可用性与供应商协商。注:本标准中产品名称中出现的“锁”一词是一个历史上与其标识相关的通用术语，并不意味着使用紧固件的附件中固定性的永久性。 并入B18。21.1-2009是B18。22.1-1965，平垫圈。

This Standard covers the dimensional requirements, physical properties, and related test methods for helical spring-lock washers (# 0 through 3 in.), tooth-lock washers (# 2 through 1 3⁄4 in.), and plain washers (# 0 through 3 in.).The inclusion of dimensional data in this Standard is not intended to imply that all products described are stock production items. Consumers should consult with suppliers concerning the availability of products.NOTE: The wordlockappearing in the names of products in this Standard is a generic term historically associated with their identification and is not intended to imply an indefinite permanency of fixity in attachments where the fasteners are used.ASME B18.21.1-2009 (R2016) is a revision and consolidation of ASME B18.21.1 and ASME B18.22.1.