ASME B18.21.1-2009 pdf download.Washers: Helical Spring-Lock, Tooth Lock, and Plain Washers (Inch Series).
Proposing Revisions. Revisions are made periodically to the Standard to incorporate changes that appear necessary or desirable, as demonstrated by the experience gained from the application of the Standard. Approved revisions will be published periodically. The Committee welcomes proposals for revisions to this Standard. Such proposals should be as specific as possible, citing the paragraph number(s), the proposed wording, and a detailed description of the reasons for the proposal, including any pertinent documentation. Proposing a Case. Cases may be issued for the purpose of providing alternative rules when justified, to permit early implementation of an approved revision when the need is urgent, or to provide rules not covered by existing provisions. Cases are effective immediately upon ASME approval and shall be posted on the ASME Committee Web page. Requests for Cases shall provide a Statement of Need and Background Information. The request should identify the standard, the paragraph, figure or table number(s), and be written as a Question and Reply in the same format as existing Cases. Requests for Cases should also indicate the applicable edition(s) of the standard to which the proposed Case applies. Interpretations. Upon request, the B18 Standards Committee will render an interpretation of any requirement of the Standard. Interpretations can only be rendered in response to a written request sent to the Secretary of the B18 Standards Committee. The request for an interpretation should be clear and unambiguous. It is further recommended that the inquirer submit his/her request in the following format: Subject: Cite the applicable paragraph number(s) and the topic of the inquiry. Edition: Cite the applicable edition of the Standard for which the interpretation is being requested. Question: Phrase the question as a request for an interpretation of a specific requirement suitable for general understanding and use, not as a request for an approval of a proprietary design or situation.
1 GENERAL DATA RELATED TO ALL WASHERS 1.1 Scope 1.1.1 This Standard covers the dimensional requirements, physical properties, and related testmeth- ods for helical spring-lock washers (# 0 through 3 in.), tooth-lock washers (# 2 through 1 3 ⁄ 4 in.), and plain wash- ers (# 0 through 3 in.). 1.1.2 The inclusion of dimensional data in this Standard is not intended to imply that all products describedarestockproductionitems. Consumers should consult with suppliers concerning the availability of products. NOTE: The word lock appearing 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 perma- nency of fixity in attachments where the fasteners are used. 1.2 Comparison to ISO Standards No comparable ISO standards exist for these parts. 1.3 Types 1.3.1 Helical Spring-Lock Washers. This Standard covers helical spring-lock washers of the following sec- tions: regular, heavy, extra duty, and high-collar. 1.3.2 Tooth-Lock Washers. This Standard covers tooth-lockwashers ofthe following types: internal tooth, external tooth, countersunk external tooth, internal/ external tooth, and of two constructions, designated Types A and B. 1.3.3 Plain Washers. This Standard covers plain (flat) washers of three constructions designated Type A, Type B, and Fender washers. 1.4 Dimensions All dimensions in this Standard are given in inches and are applicable before any coating is applied.
ASME B18.12, Glossary of Terms for Mechanical Fasteners ASME B18.18.2M, Inspection and Quality Assurance for High-Volume Machine Assembly Fasteners Engineered Applications ASME B18.24, Part Identifying Number (PIN) Code System Standard Publisher: The American Society of Mechanical Engineers (ASME), Three Park Avenue, New York, NY 10016-5990; Order Department: 22 Law Drive, P.O. Box 2900, Fairfield, NJ 07007 (www.asme.org) ASTM B 99, Standard Specification for Copper-Silicon Alloy Wire for General Applications ASTM B 159, Standard Specification for Phosphor Bronze Wire ASTM B 211, Standard Specification for Aluminum and Aluminum-Alloy Bar, Rod, and Wire ASTM B 591, Standard Specification for Copper-Zinc- Tin and Copper-Zinc-Tin-Iron-Nickel Alloys Plate, Sheet, Strip, and Rolled Bar ASTM B 695, Coatings of Zinc Mechanically Deposited on Iron and Steel ASTM E 140, Standard Hardness Conversion Tables for Metals (Relationship Among Brinell Hardness, Vickers Hardness, Rockwell Hardness, Rockwell Superficial Hardness, Knoop Hardness, and Scleroscope Hardness) ASTM F 436, Standard Specification for Hardened Steel Washers